Abstract:
A management data distribution apparatus has, a control unit, a buffer memory element, at least one input port, and a telecommunications output. The at least one input port is arranged to receive management data from devices located within a network and to pass the management data to the control unit. The control unit is arranged to control output of the management data via the telecommunications output to a remote monitoring site over a telecommunications network. The control unit is also arranged to store management data arriving at the at least one input port when the said telecommunications output is in use in the buffer memory element, temporarily.

Description:
FIELD OF THE INVENTION 
     This invention relates to the remote monitoring of computer devices, and to apparatus to monitor devices remotely. 
     BACKGROUND TO THE INVENTION 
     It is becoming more and more important to monitor the performance of computers and computer/processor controlled devices as they become more and more critical to the proper performance of machines and businesses. For example, many financial institutions, or other transaction-based businesses, rely on computers to track and record transactions, events, and the current status of data in their systems. Failure of a memory unit of a data storage/record computer can be disastrous for a business. It is known to use RAID techniques to minimise the risks of the failure of a single hard disc bringing down a data record and management system. So called “data centres” exist to which organisations can outsource the management of their mission—critical data management and storage. A fee is paid to the data centres for housing the data records and managing them. Top quality hard discs are used in such data centre data recording/management devices. These are of better quality than “high street” hard drives and are more robust and tolerant of their environment. Each disc array may typically be able to hold a Tb of data. Since the data record computers of data centres are so critical to the operation of the data centre, and of their customers, even with RAID techniques it is common to have the further safety system of monitoring the performance and characteristics of each data storage/management device in the data centre. Typically a data centre storage device may have monitored its physical orientation, its temperature, read or write errors for each disc of the disc arrays monitored, disc failure monitored, and include any other parameter or value which may be helpful to indicate a need to repair or maintain the device. This device operational capability/influencing data is communicated to the data centre network operations centre (i.e. the organisation that is responsible for maintaining the data centre) by a dedicated telephone line. This provides “phone-home” capability: the device automatically telephones its “owner” to report malfunctions, or things which may cause malfunction (or indeed to report anything else that it is configured to report). This up to date information is very valuable to the “owner” of the device/data centre manager. 
     Some organisations may have many data recording and management devices in a data centre, possibly  20  or more. Each device has its own dedicated telephone line. Each line may cost of the order of $100-$200 per month. This phone line rental costs $4000 per month, or more, are possible for organisations which have many devices at a data centre. This is perceived as simply the price of doing business. A cheaper alternative would be to have each device post its “phone-home” alert data onto its own webpage of its devices. However, putting sensitive data on the web does not come naturally to discrete careful organisations such as banks, share traders, and other businesses, for security reasons. Thus dedicated land-based telephone lines are preferred which are permanently connected to the customers own monitoring computers. 
     Each disc controller (or other peripheral having a management system, for example a tape controller) may have dedicated telephone connection to a service centre. Should a problem or fault be noted the controller telephones the disc manufacturer and informs them of the situation. As each disc controller requires its own telephone line this can be a costly exercise. 
     Remote back up systems for data centres where each data storage device, or disc array, has a dedicated output phone line are known, see for example EP 0 910 019. 
     Also, the upload of control data, for example peripheral component configuration data, is possible and is discussed in U.S. Pat. No. 4,695,946. 
     SUMMARY OF THE INVENTION 
     It is an aim of at least one embodiment of the invention to provide a new way of monitoring a remote data recording/management device and preferably of monitoring a plurality of remote data recording/management devices. 
     According to a first aspect of the present invention there is provided a management data distribution apparatus comprising: 
     a control unit; 
     a buffer memory element; 
     at least one input port; 
     a telecommunications output; 
     said at least one input port being arranged to receive management data from a plurality of devices located within a network and to pass said management data to said control unit, said control unit being arranged to control output of said management data via said telecommunications output to a remote monitoring site over a telecommunications network and to store management data arriving at said at least one input port when said telecommunications output is in use in said buffer memory element, temporarily. 
     There may be a single telecommunications connection operable at any one time arranged to link a plurality of devices to a remote monitoring station via the telecommunications network. There may be between any two of the following number of devices connected to the data management apparatus: 2, 10, 20, 30, 31 or more. 
     The data management apparatus may include a processor that may be arranged to determine whether the telecommunications connection is in use. The data management centre may include a buffer memory that may be arranged to store the data should the telecommunications connection be in use. The data management apparatus may contain the buffer memory. The data management apparatus may be arranged to output the data when the telecommunications connection is no longer in use. 
     The data management apparatus may include a logging device. The logging device may be arranged to record details of data either entering or exiting the data management apparatus. The logging device may be arranged to record data either entering or exiting the data management apparatus. The logging device may be the memory element. 
     The data management apparatus may include a sensor or a monitor that may be arranged to monitor the status of at least one parameter that may be indicative of the status of at least one device, or part of, the data centre. 
     The data management apparatus may include a logging device, which may or may not be the same as the first logging device. The logging device may be arranged to record at least one parameter that may be indicative of the status of at least one device, or part, of the data centre. The parameter may be provided in the form of a numerical value or an alphanumeric string. 
     The signal may contain an identifier associated with the any one device. The signal may contain data relating to the status of the any one device. The apparatus may be arranged to output the signal to a maintenance centre in response to the data relating to the status of the any one device. 
     The input port may be a peripheral component interconnect (PCI) board, as may be the output board. The PCI input board may be arranged to receive signals from an Ethernet. The input port and the output port may be combined on a single PCI board. 
     The memory element may be either or both of a non-volatile memory element or a buffer memory element. The non-volatile memory element may be a magnetic hard disc, or it may be a plurality of magnetic hard discs typically arranged in a RAID 1 arrangement. The memory element may be arranged to log data that enters or exits the apparatus and may be arranged to log the time and/or date of the data exiting the apparatus. The memory element may be arranged to retain a copy of data exiting the apparatus via the output port. 
     The processor may be arranged to inspect a signal from the output port in order to ascertain if the output port is in use. The processor may be arranged to write the signal to the buffer memory element if the signal from the output port indicated that the output port is in use. 
     The output port may be configurable to allow the upload of data from an external network element. The data may relate to any one, or combination of the following: internet protocol (IP) address of the apparatus, network mask, gateway. The data may relate to either the apparatus or any one of the devices. 
     The apparatus may be arranged within in firewall. 
     According to a second aspect of the present invention there is provided a data centre comprising: 
     a plurality of data storage devices; 
     a management data distribution apparatus including: 
     a control unit, a buffer memory element, at least one input port and a telecommunications output port; 
     a network including said data storage devices and said distribution apparatus; 
     said at least one input port being arranged to receive management data relating to at least one of said data serving devices and to pass said management data to said control unit, said control unit being arranged to output said management data via said telecommunications output to a remote monitoring site over a telecommunications network and to store management data arriving at said at least one input port when said telecommunications output is in use in said buffer memory element, temporarily. 
     There may be a single telecommunications connection operable at any one time arranged to link a plurality of devices to a remote monitoring station via the telecommunications network. There may be between any two of the following number of devices connected to the data management apparatus: 2, 10, 20, 30, 31 or more. 
     The data management apparatus may include a processor that may be arranged to determine whether the telecommunications connection is in use. The data management centre may include a buffer memory that may be arranged to store the data should the telecommunications connection be in use. The data management apparatus may contain the buffer memory. 
     The data management apparatus may include a logging device. The logging device may be arranged to record details of data either entering or exiting the data management apparatus. The logging device may be arranged to record data either entering or exiting the data management apparatus. The logging device may be the memory element. 
     The data management apparatus may include a sensor or a monitor that may be arranged to monitor the status of at least one parameter that may be indicative of the status of at least one device, or part of, the data centre. 
     The data management apparatus may include a logging device, which may or may not be the same as the first logging device. The logging device may be arranged to record at least one parameter that may be indicative of the status of at least one device, or part, of the data centre. The parameter may be provided in the form of a numerical value or an alphanumeric string. 
     The host devices may be arranged to be connected to the disc unit by a fibre channel switch. The data network may be an Ethernet network. 
     The host devices and/or the data management apparatus may be arranged to receive telecommunications signals typically from the telecommunications network. The data management apparatus may be arranged to evaluate incoming telecommunications signals and may be arranged to direct them via the data network to a device for which they are intended. The signals may be intended for the data management unit, a fibre channel switch, a disc array or a host device. The signals may include configuration data. 
     The memory unit may include a hard disc, or discs, and may include a controller. The hard disc(s) may have an aggregated data storage capacity of at least any one of the following: 50 GB, 100 GB, 200 GB, 500 GB, ITB. 
     The data management apparatus may include PCI cards. The PCI cards may be arranged to be connected to an Ethernet, the data network, the telecommunications network. The processor may be arranged to interrupt the PCI cards, typically to interrogate them to ascertain if they are in use. 
     The data management apparatus may include a plurality of discs arranged in a fault tolerant RAID configuration. The data management apparatus may include input means that may be arranged to enable configuration data to be uploaded into the apparatus. The input means may be a universal serial bus (USB) connection or it may be a PCI card. The USB connection may be arranged for the connection of input elements, such as for example, a mouse or a keyboard, to the data management apparatus. There may be provided an installation device that may be arranged to connect to the input means. The installation device may be arranged to upload a network address (for example an internet protocol (IP) address) for any one of the following: any one of the host devices, a fibre channel switch, a gateway, a disc array, the data management apparatus. The installation device may include manually operable selection means. The installation device may include a display. The display may be arranged to display visual representations of the network and/or the configuration data. The selection means may be arranged to select the data and a network element to which it relates. The display may be an LCD display. There may be provided a keyboard and/or a mouse associated with the installation device that may at least in part constitute the selection means. Preferably, the selection means may be a keypad that may be mounted upon the installation device. 
     The telecommunications connection may be a permanently open telephone line. The telecommunications link may be to a public switched telecommunications network (PSTN), a public switched data network (PSDN) or an integrated services digital network (ISDN). 
     The data network may be within a firewall. The data management apparatus may be within the firewall. 
     There may be a wide area network (WAN) including a data centre according to the second aspect of the present invention, a telecommunications connection and a remote monitoring station. 
     The telecommunications connection arranged to transfer data between the data centre and the monitoring station. The remote monitoring station arranged to inform a vendor/engineer of a fault/problem associated with a device connected to the data network. 
     According to a third aspect of the present invention there is provided a method of placing a plurality of electronic devices in communication with a remote monitoring station comprising the steps of:
     i) connecting a plurality of network elements to a data management apparatus;   ii) providing the network elements with an identifier;   iii) connecting the data management apparatus to a telecommunications connection;   iv) connecting an individual network element to a remote monitoring station via the data management apparatus and the telecommunications connection.   

     The method may include providing only a single telecommunications connection or a limited number of telecommunications connections, typically less than 10% of the number of network elements, between the data management apparatus and the monitoring station. 
     The method may include connecting the network elements to the data management apparatus over a network. The method may include providing the network in the form of an Ethernet. The method may include employing the simple network management protocol (SNMP). 
     The method may include providing the network elements in the form of any one, or combination, of the following: a memory unit (for example a disc array), a fibre channel switch, a terminal, a gateway. The method may include storing data on the memory unit. 
     The method may including providing the telecommunications connection in a permanently open state. The method may include utilising a land based telecommunications connection. The method may include providing the telecommunications link in any one, or combination, of the following forms: PSTN, PSDN, ISDN. 
     The method may include recording a log of all data/signals entering and/or exiting the data management apparatus. The method may include recording all data/signals entering and/or exiting the data management apparatus. 
     The method may include establishing if a signal/data received by the data management apparatus from the remote monitoring station correlates to the data management apparatus network address or the network address of a network element and forwarding the signal/data to the network address. The method may include providing the network address in the form of an IP address. The method may include storing a database/look up table of network elements network addresses. The method may include adding the network address of a given network element to a signal/data which is originates from said given network element. The method may include multiplexing data/signals from a plurality of network elements and may include outputting the multiplexed data/signal via the telecommunications connection. 
     The method may include dialing up the data management apparatus via the telecommunications connection. The method may include providing the telecommunications network in the form of a dedicated telephone line. 
     According to a fourth aspect of the present invention there is provided software which when operating upon a processor causes a data management apparatus to receive signals from a plurality of network elements, determine whether it is necessary to transmit at least one of said signals via a telecommunications connection, format said at least one signal in an appropriate manner so as to make it suitable for transmission via said connection, and transmit said at least one suitably modified signal via said connection. 
     The software may cause the processor to store the signal in a buffer, typically if the connection is already in use. The software may cause the processor to store a log of signals entering and/or exiting the data management apparatus, typically in a log memory unit. The software may cause the processor to store the signals entering and/or exiting the data management apparatus, typically in a log memory unit. The software may cause the processor to add a network address (for example an IP address) of the network element generating the signal to the signal. The software may cause the data management apparatus to transmit the suitably modified signal to a remote monitoring station. 
     According to a fifth aspect of the present invention there is provided method of retrofitting a data management apparatus, according to a first aspect of the present invention, configurable to connect to network elements on a network comprising: 
     connecting said management data distribution apparatus to said network; and 
     connecting said management data distribution apparatus to said telecommunications network via said telecommunications output. 
     The method may include connecting the data management apparatus to a remote monitoring station via the telecommunications link. The method may include configuring the data management apparatus network details, for example for an Ethernet, this will include setting up a network address (for example an IP address) for the data management apparatus, net mask, gateway and refining these settings as required. 
     According to a sixth aspect of the present invention there is provided a method of providing a network with a remote upgrade/modification capability comprising: 
     fitting a data management apparatus to the network; 
     utilising the data management apparatus to receive incoming instructions via a telecommunications connection; and 
     distributing said incoming instructions over the network to an appropriate network element. 
     According to a seventh aspect of the present invention there is provided a method of reducing the cost of remotely monitoring a large number of network elements comprising: 
     connecting a data management apparatus according to the first aspect of the present invention to a network of network elements to be monitored; 
     utilising the data management apparatus as telecommunication gateway to the networked devices. 
     The method may include providing only a single telecommunications link from the data management apparatus. 
     According to an eight aspect of the present invention there is provided a method of remote monitoring of network elements in a data centre comprising having a data management apparatus. 
     According to a ninth aspect of the present invention there is provided a method of producing a data centre in accordance with the second aspect of the present invention comprising: 
     providing a data management apparatus; 
     retrofitting the data management apparatus to a network; 
     disabling individual telecommunications connections from the devices to the monitoring station; and 
     utilising the data management apparatus as a data conduit between the data network and the telecommunications network. 
     According to a tenth aspect of the present invention there is provided A wide area network (WAN) including a data centre comprising: 
     a plurality of data storage devices; 
     a management data distribution apparatus including: 
     a control unit, a buffer memory element, at least one input port and a telecommunications output port; 
     a network including said data storage devices and said distribution apparatus; 
     said at least one input port being arranged to receive management data relating to at least one of said data serving devices and to pass said management data to said control unit, said control unit being arranged to output said management data via said telecommunications output to a remote monitoring site over a telecommunications network and is arranged to store management data arriving at said at least one input port when said telecommunications output is in use in said buffer memory element, temporarily. 
     According to an eleventh aspect of the present invention there is provided a method of placing a network element in communication with a remote monitoring station comprising the steps of: 
     i) connecting each of a plurality of network addresses to a management data distribution apparatus; 
     ii) receiving management data from at least one of said network addresses at said management data distribution apparatus; 
     iii) connecting said data management distribution to a remote monitoring station via a telecommunications output and a telecommunications network; 
     iv) storing management data received whilst said telecommunications output is in use in a data storage medium; and 
     v) outputting management data stored in step (iv) to a remote monitoring station via said telecommunications output from said data storage medium in order of said management data&#39;s storage. 
     According to a twelfth aspect of the present invention there is provided a method of reducing the number of telecommunications links to a data centre comprising the steps of: 
     i) reporting management data from one of a plurality of data storage devices to a central management data distribution apparatus; 
     ii) selecting a remote call centre to be connected from a list stored on said apparatus dependent upon which data storage device said management data relates to; 
     iii) contacting said remote call centre via a single telecommunications link; 
     iv) storing any further management data received whilst said single telecommunications link is in use; and 
     v) repeating step (ii) and (iii) for any management data stored in step (iv) when said telecommunications link is available for use. 
     According to a thirteenth aspect of the present invention there is provided a method of retrofitting a management data distribution apparatus including a management data distribution apparatus comprising: a control unit; a buffer memory element; at least one input port; a telecommunications output; said at least one input port being arranged to receive management data from a plurality of devices located within a network and to pass said management data to said control unit, said control unit being arranged to control output of said management data via said telecommunications output to a remote monitoring site over a telecommunications network and to store said management data temporarily in said buffer when said telecommunications output is in use; being configurable to connect to a network comprising: 
     connecting said management data distributing apparatus to said network; and 
     connecting said management data distribution apparatus to said telecommunications network via said telecommunications output. 
     According to a fourteenth aspect of the present invention there is provided a management data distribution apparatus comprising: 
     a control unit; 
     a data storage device; 
     at least one peripheral components interconnect port; 
     a modem; 
     said at least one peripheral components interconnect port being arranged to receive management data from a plurality of data storage device arrays located within a network and to pass said management data to said control unit, said control unit being arranged to control output of said management data via said modem to a remote monitoring site over a public switched telecommunications network and to store said management data temporarily in said data storage device when said modem is in use. 
     According to a fifteenth aspect of the present invention there is provided a data centre comprising: 
     a plurality of data storage device arrays; 
     a management data distribution apparatus including: 
     a control unit, a data storage device, at least one peripheral components interconnect port and a modem; 
     a network including said data storage device arrays and said distribution apparatus; 
     said at least one peripheral components interconnect port being arranged to receive management data relating to at least one of said data storage device arrays and to pass said management data to said control unit, said control unit being arranged to output said management data via said modem to a remote monitoring site over a public switched telecommunications network and to store said management data temporarily in said data storage device when said modem is in use. 
     According to a sixteenth aspect of the present invention there is provided a method of placing a disc array in communication with a remote monitoring station comprising the steps of: 
     i) connecting each of a plurality of data storage device arrays to a management data distribution apparatus; 
     ii) receiving management data from at least one of said data storage device arrays at said management data distribution apparatus; 
     iii) connecting said data management distribution to a remote monitoring station via a modem and public switched telephone network; 
     iv) storing management data received whilst said modem is in use in a data storage device; and 
     v) outputting management data stored in step (iv) to a remote monitoring station via said modem from said data storage device in order of said management data&#39;s storage. 
     According to a seventeenth aspect of the present invention there is provided a method of reducing the number of telephone lines to a data centre comprising the steps of: 
     i) reporting management data from one of a plurality of data storage device arrays to a central management data distribution apparatus; 
     ii) selecting a remote call centre to be connected from a list stored on said apparatus dependent upon which apparatus said management data relates to; 
     iii) contacting said remote call centre via a single telephone line; iv) storing any further management data received whilst said single telephone line is in use; and 
     v) repeating step (ii) and (iii) for any management data stored in step (iv) when said telecommunications link is available for use. 
     According to an eighteenth aspect of the present invention there is provided a method of reducing the cost of operating a data centre comprising the steps of: 
     i) monitoring performance metrics of at least two data storage devices owned by at least two entities; 
     ii) generating respective management data sets for each of said at least two data storage devices; 
     iii) outputting each of said respective management data sets to respective remote monitoring stations using a single telecommunications output, spaced apart in time. 
     According to a nineteenth aspect of the present invention there is provided a management data distribution apparatus comprising: 
     an input arranged to receive management data from each of a plurality of network elements; 
     a telecommunications output arranged to output a portion of said management data to a remote monitoring station out-of-band; and 
     a buffer memory element arranged to store management data received at said input whilst said portion of said management data is output. 
     According to a twentieth aspect of the present invention there is provided a method of distributing management data comprising the steps of:
     i) receiving management data at an input from each of a plurality of network elements; and   ii) outputting said data out-of-band in a first in first out manner to appropriate remote monitoring stations.   

    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic representation of a prior art data management centre; 
         FIG. 2  is a schematic of an embodiment of a data management centre according to an aspect of the present invention; 
         FIG. 3  is a schematic representation of an embodiment of a data management apparatus according to an aspect of the present invention; 
         FIG. 4  is a drawing of an embodiment of a mobile configuration installation device according to an aspect of the present invention; 
         FIG. 5  is a flowchart detailing a method of data management and remote monitoring in accordance with an aspect of the present invention; 
         FIG. 6  is a flowchart detailing a method of updating a networked device via the data management apparatus of  FIG. 3 ; and 
         FIG. 7  is a schematic representation of a detailing cost saving arrangement according to an aspect of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     It will be understood that the term management data is used to encompass data generated by a storage device, or other network element, in relation to its status that can be used by engineers for diagnostic and fault tracing purposes. Management data does not relate to primary data, i.e. data that is retained upon a storage device that is intended for retrieval by a general user under normal operation. 
     Typical forms of management data for a disc array include data relating to physical orientation, its temperature, read or write errors for each disc of the disc arrays monitored, disc failure monitored, and any other parameter or value which may be helpful to indicate a need to repair or maintain the device. 
     More generally management data for a data storage device can include spare unused capacity of the device to perform it&#39;s function or, conversely, the utilisation level of the device, bit error rate data, status of the device&#39;s power supply, data rate of a telecommunications link with the device, bandwidth required by a device. 
     In particular, data relating to the bit error rate of a device is useful, as an increase in the bit error rate can be an early indicator of impending device failure. Similarly, a decrease in the data rate across a telecommunications link with the device can indicate a device failure, particularly if the data rate falls to zero as this can indicate a catastrophic device failure. 
     The use of a separate, distinct, secondary interface, typically an Ethernet connection, for the accessing and transmission of management data other than the primary interface, typically a small computer systems interface (SCSI) or fibre channel, used for accessing primary data allows the management data to be out-of-band of primary data channels. This means that the transfer of management data does not impose upon the bandwidth available for primary data transfer and thereby maintains primary data transfer at as high a data transfer rate as possible. Thus such an arrangement is preferable to an in-band network configuration where both the primary data and the management data are transferred over a single primary network interface as part of the bandwidth nominally available for primary data transfer is occupied by the secondary, management, data. 
     Referring now to  FIG. 1 , this shows a prior art arrangement of data storage facility. Data from a range of external hosts is routed via a fibre channel switch to high quality hard disc arrays. These disc arrays are usually sensitive to their surroundings and have a storage capacity of about 1 TB. The fibre channel switch typically has between 16 and 32 ports, which increases fan out from the disc array, which typically has between 8 and 32 ports. A disc controller regulates the distribution of data to the discs and also monitors the discs data channels and the disc surroundings for any faults or problems. 
     Data management apparatus according to the first aspect of the present invention is hereinafter referred to as a multiplexing autodialler or an autodialler. 
       FIG. 2  shows a secure data storage network  10  comprising hosts  12   a - l  fibre channel switches  14   a - c , hard disc arrays  16   a - f , disc controllers  18   a - c  a network spine  20 , a firewall  19  a network management server  22  and a multiplexing autodialler  24 . 
     The hosts  12   a - d ,  12   e - h ,  12   i - l  are connected to their respective fibre channel switches  14   a ,  14   b ,  14   c  in the conventional manner. The hosts  12   a - i  are also connected directly to the network spine  20 , typically via ethernet connections. 
     Similarly, the fibre channel switches  14   a - c  are connected to their respective hard disc arrays  16   a,b ,  16   c,d ,  16   e,f  in a conventional manner. The fibre switches  14   a - c  are connected to the network spine  20 , again typically via ethernet connections. 
     The disc controllers  18   a - c  are connected to the network spine  20 . 
     The management server  22  and the multiplexing autodialler  24  are connected to each other and also independently to the network spine  20 . The autodialler  24  has a dedicated telephone link  26  to a service centre  28 . The telephone link  26  will typically be a public switched data network (PSDN) link to the service centre  28  or it may be a public switched telephone network (PSTN) link. The telephone link  26  may be permanently open, or there may be a dial up connection between the server  22  and the service centre  28 . 
     In use, each of the hosts  12   a - l  fibre channel switches  14   a - c , and especially the disc controller  18   a - c  have monitoring software  12 ′ a - l ,  14 ′ a - c ,  18 ′ a - c  running thereupon. Should the monitoring software  12 ′ a - l ,  14 ′ a - c  or  18 ′ a - c  note a fault upon any network element  12   a - l ,  14   a - c ,  18   a - c  a signal  30  is sent to the management server  22  and the autodialler  24  via the network spine  20  by the software  12 ′ a - l ,  14 ′ a - c ,  18 ′ a - c  running on the respective network element. 
     Typical errors that may cause a signal  30  to be sent to the server  22  and autodialler  24  include variations in humidity or temperature beyond permitted tolerances, a change in orientation of a disc drive, disc drive failure, a repeated write or read error to/from a disc, connection problems between network elements, fire or flood alarms, tape drive failures, data backup events/failure, TapeAlert conditions and informational events from the network infrastructure (e.g. network link failed or network gateway disappeared). 
     The signal  30  will identify the faulty network element typically by an internet protocol (IP) address or any other convenient identities and contain details of the nature of the fault. 
     The signal  30  arrives at the autodialler  24 , described in detail hereinafter, and activates the telephone link  26  to the call centre  28 . The identity of the faulty network element and the nature of the fault are relayed to the call centre  28  for assessment by an engineer. 
     The telephone link  26  can be configured to allow only outgoing calls for increased network security or it can be configured to allow limited access from the call centre  28  to authorised personnel, for example with a valid user identifier and password, in order that firmware operating inside the autodialler  24  can be remotely updated, thus reducing maintenance charges for call outs. 
     As data transfer and routing of data are executed without any connection to the outside of the firewall  19  being necessary the network  10  allows increased redundancy of system components without compromising data integrity and security with the use of a single telephone link  26  to the service centre  28  reducing the number of possible points of attack compared to the prior art arrangements and thereby increasing data security still further. 
     Referring now to  FIG. 3 , a multiplexer autodialler  24  comprises a plurality of peripheral component interconnect (PCI) input/output (IO) ports  32   a - e , a bus  34 , a buffer memory  36 , a log memory  37 , a processor  38 , a power supply  40 , a monitor circuit  42  and a cooling element  44 . 
     One of the PCI IO ports  32   d  is a network link (e.g. Ethernet link) to the network spine  20  and another of the PCI IO ports  32   e  is the connection point for the telephone link  26  to the service centre  28 . The remaining PCI IO ports  32   a - c  are typically used to upload data to the autodialler  24 , download activity logs from the autodialler  24  or to serve as direct connections to any of the elements present on the network  10 . 
     The PCI IO ports  32   a - c  can be used as reserve input lines from the ethernet or as reserve output lines to the telephone link  26  to increase redundancy within the network  10 . A device, for example a disc controller, may require a direct connection to the autodialler  24  if it is particularly crucial to a clients database, handles particularly sensitive data or a large volume of data. 
     A data signal, for example the fault signal  30 , enters the autodialler along one of the PCI IO ports  32   a - d , either from a direct link or via the network spine  20 . The data is passed onto the bus  34  where the processor  38  assesses the current autodialler status. This status assessment includes checking the monitor circuit  42  which typically monitors the power supply  40 , the level of the buffer  36  and the state of the activity of the PCI IO ports  32   a - e , in particular the PCI IO port  32   e  which is connected to the telephone link  26 . 
     If the processor  38  receives notification from the monitor circuit  42  that the PCI IO port  32   e  is busy the processor  38  directs the data to be stored in the buffer  36  temporarily. The buffer  36  is typically a few MB to a few GB in order that a number of data signals can be stored sequentially, in order of their arrival. The purpose of the buffer  36  is so that the autodialler  24  does not appear to be busy when a fault signal is input to one of the PCI IO ports  32   a - d  even if the output PCI IO port  32   e  is in use. 
     Once the call to the service centre  28  that is occupying the PCI IO port  32   e  is completed the next data set stored in the buffer  36  is output via the PCI IO port  32   e , i.e. the buffer  36  acts as a “first in, first out” store of data so that calls to the service centre  28  are dealt with in the order that they are received by the autodialler  24 . 
     Every time a data set is received by or transmitted from the autodialler  24 , the processor issues a log command that is recorded in the log memory  37 . The log memory  37  is typically a hard disc that is intended to provide a complete and accurate record of the data passed into and out of the autodialler in case, for example a power failure should occur whilst there is data in the buffer  36  that could be lost and also to provide an audit trail in order that fault histories can be analysed to look for recurring faults or trends. It is usual to provide at least two hard discs configured such data placed on any one of the discs is mirrored on the other disc(s), i.e. a RAID 1 arrangement. This arrangement increases the fault tolerance of the autodialler. 
     Typically, the log disc(s) will be removable to allow for their replacement by non-skilled operators should a fault in one of them occur. Also, should another one of the components of the autodialler  24  fail, other than the disc(s) then, the disc(s) can be removed or placed in a reserve autodialler. This allows a continuous log to be generated using the same discs. 
     It will be appreciated that if a high level of redundancy is required with the autodialler some or all of the primary components, i.e. processor, memory log, buffer, bus, PCI IO ports, and power supply, will have identical reserve components which can be engaged should the monitor circuit  42  detect a fault associated with any specific component. 
     A different service centre  28  may serve each disc array  16   a - f  and they will therefore have a differing telephone numbers that must be dialled by the autodialler  24  in the event of a fault being logged. In order to achieve this each PCI IO card  32   a - d  has its status checked by the processor  38  when a fault signal  30  is received by the autodialler  24  using embedded operating systems interrupt handling. The processor  38  reads the device i.d. from the data signal and obtains the appropriate telephone number for the device from a look up table which is typically stored in non-volatile RAM of the autodialler  24  during a set up procedure, described hereinafter, or during an upload of data from the call centre  28 , as described hereinbefore. The telephone number is used immediately to access the telephone link  26  to the appropriate call centre  28  if the telephone link is not in use. However, if the telephone link  26  is in use the telephone number is appended to the data signal  30  and is stored in the buffer with the data signal  30  so that the correct call centre  28  can be dialled at a later point in time, with the processor  38  removing the appended telephone number and using it to dial the appropriate call centre. 
     The autodialler  24  will typically be a PC processor box running on appliances operating systems such as linux or embedded windows. This operating system can be updated via the telephone link  26  from the call centre  28 . Alternatively, it can be updated locally using a management console  46 , as shown in  FIG. 4 . The management console  46  comprises an LCD screen  48 , an array of buttons  50   a - e , a co-axial connections  52   a - d , universal serial bus (USB) ports  54   a - e , and a peripheral port  56 . 
     The management console  46  typically connects to one of the PCI IO ports  32   a - c  via either a network connection or a telephone line. The screen  48  displays for example, network configuration parameters  58  for example for Ethernet, the IP address, netmask and gateway to be assigned if the telephone link is not in use to the autodialler  24 . A user of the console  46  navigates through menus  60  and other text  62  using the directional keys  50   a - d  and confirms any selection they make using the enter key  50   e . alternatively, a keyboard and/or mouse (not shown) can be connected to the console  46  via the peripheral port  56 . This enables the direct entry of text and/or the navigation of menus  60  and text  62 . It is possible to manage transaction logs, purge old entries, obtain performance statistics and carry out trend analyses via the console  46 . 
     The coaxial connectors  52   a - d  allow the console to be connected to a screen (not shown) or other devices for example network ports, switches and telecommunication output lines from other devices, and the plurality of USB ports  54   a - e  allow more than one autodialler to be configured from a single controller. 
     It will be appreciated that whilst “phone home” arrangements are common in the more expensive “high end” disc arrays they are not as common in “low” to “mid-range” disc arrays because of the cost of maintaining many individual telephone connections for disc arrays. However, if a single telephone connection can be used for many disc arrays, as exemplified by the present invention, this financial impediment to the use of “phone home” arrangements is removed. Indeed, it is possible that multiple user organisations could share the cost of a single multiplexing autodialler and telephone link. 
     It will also be appreciated that such data management systems and remote monitoring systems are not only applicable to disc arrays but also to tape drives and/or tape drive libraries. 
     Referring now to  FIG. 5 , this is a flow diagram detailing one method of remote monitoring of computer systems using a multiplexing autodialler  24 . 
     The processor  38  of the autodialler  24  interrupts the PCI IO port to check if a signal has been received from a connected device (step  64 ). If no signal has been received the processor waits a predetermined amount of time, typically a few seconds, (Step  66 ) before again checking if a signal has been received (step  64 ). However, upon a signal being received it is sent to the processor  38  for evaluation. (Step  68 ). The processor  38  determines whether the signal requires logging (step  70 ) and if it is not necessary to log the signal the autodialler  24  sends a signal to the device, if appropriate (Step  71 ) for example if a disc array is currently undergoing test or development and is not in on-line use. 
     Should the signal require logging it is logged to the log memory  37  (Step  72 ). The processor  38  this determines whether the signal needs communicating to the call centre  28  (step  74 ), if not, no further action is taken (step  76 ). If the signal needs to be communicated to the call centre  28  the processor checks to see if the telephone link  26  is in use (step  78 ). If the telephone link  26  is in use the signal is stored in the buffer (step  80 ) and the processor  38  rechecks the availability of the telephone link  26  after a set time, typically a few seconds. If the telephone link  26  is free a telephone number appropriate for the device is dialled and the signal is sent, to the call centre  28  via the telephone link  26 . (step  82 ). 
     The processor  38  issues an interrupt to determine if the signal has been successfully sent to the call centre  28  (step  84 ). If the signal has been successfully sent to the call centre this fact is logged (step  86 ). However, if the signal has not been sent to the call centre this fact is logged in the log memory and the signal resent (step  88 ). 
     Referring now to  FIG. 6  this is a flow diagram of a method of updating software and/or firmware contained in a device. An update is transmitted to the autodialler  24  from the call centre  28  via the telephone link  26 . (step  90 ). The autodialler  24  identifies which device requires updating (step  92 ) typically by reading a header portion of the signal. The autodialler  24  itself may require updating or it could be any other device connected to the network spine  20 . The processor  38  decides whether to record the update of the memory  37  (step  93 ). This allows either some or all of the updates to be stored so as to have a record of any updates performed for audit or other purposes. 
     The autodialler  24  issues the update to the device identified (step  94 ) from the previous step. The device is updated and issues a confirmation signal to the autodialler  24  (step  96 ) which itself then issues a confirmation signal to the call centre  28  via the telephone link (step  98 ). 
     Referring now to  FIG. 7 , a plurality of telephone connections  100   a - n  from devices  102   a - n  from devices in a data management centre  104  can be reduced in number, typically to just a few telephone connections or, as shown, to a single telephone connection  106  from the devices  102   a - n  using a data management apparatus according to an aspect of the present invention, thereby reducing costs. 
     It will be appreciated that the network element may comprise discrete physical, addressable devices, but could, additionally or alternatively, comprise network addressable logical connections.