Abstract:
Automated reconfiguration of computer workstations as tester workstations and host workstations by querying the user for the network address of the tester to be swapped out and copying, creating and reconfiguring the configuration files for the network on the system to be swapped in. This invention allows an engineering department to use a workstation for off-line development and eliminates the need to provide a spare tester workstation to replace a failed tester workstation. Additionally, one embodiment of the invention provides automated reconfiguration of a tester workstation as a host workstation.

Description:
BACKGROUND 
     1. Technical Field 
     This invention relates generally to the reconfiguration of computers on a computer network. More particularly, this invention relates to a method and system for automatic reconfiguration of tester systems and host a systems in an electronic testing and manufacturing environment. 
     2. Background of the Invention 
     Large scale electronics manufacturing requires complex testing systems for both electronic components and electronic assemblies. One of the larger manufacturers of test equipment for this application is Teradyne, Inc. in Boston, Mass. 
     A typical tester, such as a Teradyne J994, has a UNIX workstation attached which runs all of the testing software and controls the tester itself. The tester workstation has a specially configured kernel as well as one or more specific devices files which allow it to interact with and control the tester. Several tester workstations may be networked together to allow monitoring of the tester workstations as well as communications between tester workstations and other networked devices. Unfortunately, when one of the tester workstations experiences either software or hardware difficulties, it is necessary to replace the tester workstation with either a spare tester workstation or another UNIX workstation and reconfigure the new UNIX workstation as a tester. 
     Because of the cost associated with having a spare UNIX workstation configured as a spare tester workstation, a stand alone host system is typically substituted for the failed tester workstation and the host system is reconfigured to match the replaced tester workstation. This process can take hours and results in significant down time for the tester. Stand alone host systems may or may not also be part of the computer network and are usually configured for other tasks such as development of testing software to the dedicated tester workstations. 
     Accordingly, it would be desirable to provide a convenient, fast and therefore economical way to swap a host system in for a tester workstation. 
     SUMMARY OF THE INVENTION 
     One embodiment of the invention provides a shell script which verifies the current configuration of the replacement workstation, copies a new kernel onto the workstation to be converted into a tester workstation, creates the necessary device files, and configures the workstation to look and act like a tester workstation as opposed to a host system. This embodiment of the invention accomplishes this by querying the user for the network address of the tester workstation to be swapped out and copying, creating and reconfiguring the configuration files for the network on the system to be swapped in. This invention allows an engineering department to use a workstation for off-line development and eliminates the need to provide a spare tester workstation which is not available for off-line development. 
     Another embodiment of the invention allows reconfiguration of a tester workstation as a host workstation which is suitable for stand alone use as a development system. 
     Other advantages will become apparent to those skilled in the art from the following detailed description read in conjunction with the appended claims. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a flow diagram of one embodiment of the invention; 
     FIGS. 2 a  through  2   e  are a shell script code listing for one embodiment of the invention in the UNIX operating environment; and 
     FIG. 3 is a representative schematic diagram of a computer network in which the invention may be implemented. 
    
    
     It should be understood that the referenced drawings are intended as representations. The drawings are not necessarily intended to depict the functional and structural details of the invention, which can be determined by one of skill in the art by examination of the descriptions and claims provided herein. 
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring now to FIGS. 1-3, the invention will be described in detail. FIG. 3 shows a typical environment in which the invention may be practiced which includes networked host and tester workstations. The tester workstations are here each attached to a tester and being configured as tester workstations are here referred to as on-line. The networked host workstations are referred to as off-line, even though the off-line workstations may or may not be part of the network. The terms on-line and off-line are here meant to be specific to the subsystem of testers and tester workstations, with tester workstations being on-line and host workstations being off-line. The network of FIG. 3 also includes a development system and a server. 
     FIG. 1 graphically depicts the general methodology used to implement a particular embodiment of the invention. This particular embodiment of the invention provides for both reconfiguration of a tester workstation into a host workstation and reconfiguration of a host workstation into a tester workstation. It should be noted that both of these reconfiguration processes can be implemented independently and that, while the specific embodiment set forth in FIGS. 2 a  through  2   e  is implemented in a UNIX environment, the general methodology is applicable to other operating environments. 
     In implementing the methodology of FIG. 1, the first act which is undertaken is to check the existing system configuration for the workstation to be modified. In this particular embodiment, the existence of a device file is used to determine whether the workstation is configured as a tester workstation or as a host workstation. In this particular embodiment, the presence of the device file indicates that the system is presently configured as a tester workstation. 
     If the device file is not present, the next act to be undertaken is that the old kernel is renamed and a new tester kernel is copied from a tester workstation as the new kernel for the new tester system. Next, the necessary device file is created. The next act undertaken is to query the user for the system name which this system will be set up as. This name is then checked against the existing system name database and the IP address information is obtained for the system name. This information is then displayed for the user to verify. If the IP information does not exist or, the user does not verify the information, an error message is printed informing the user that the system is not correctly configured and therefore cannot be reconfigured. If the IP information is found and the user verifies both the system name and the IP information, the name and IP information are written to the new system&#39;s configuration file. 
     If, on the other hand, in the first act the device file was found, the invention assumes that the system is a tester system and that the user wishes to reconfigure this tester system as a host system. Analogous acts are then undertaken to reconfigure the tester system as a host system, except the device file is removed instead of created. 
     Referring now particularly to FIG. 3, one embodiment of the invention has program instructions stored with program storage devices such as hard drives or other memory devices resident within the host and tester workstations. In FIGS. 2 a  through  2   e , one embodiment of the invention uses stored programming instructions implemented in a KORN shell script. The line numbers in the figures are for explanation purposes only and do not form part of the actual shell script. This particular shell script has five subroutines, functions and a main program. The main program appears on lines  108  through  110 . The five subroutines or functions are: Make_host( ); host_setup( ); tester_setup( ); and check_system( ). The main program is simply a one line instruction which is a function call to check_system( ). 
     The check_system function appears on lines  94  through  107 . Check_system first tests for the presence of device file j994tst0. If this device file is present, check_system will call function host_setup and function make_host. If the device file is not present, check_system will call the function tester_setup and the function make_host. 
     If the device file is present, the invention assumes that the system is currently set up as a tester and that the user wishes to reconfigure the tester workstation as a host workstation. Consequently, check_system calls host_setup. 
     Host_setup appears on lines  35  through  62 . Host_setup assumes that at least one of two specific host computers are present on the network. Here the computers are named parmgh 3  and parmgh 1 . Host_setup first pings parmgh 3 . If parmgh 3  answers, host_setup will copy its kernel to a new file on the reconfigured workstation called vmunix_new. Host_setup then renames the UNIX kernel to vmunix_offline and renames vmunix_new to vmunix. If parmgh 3  does not answer as a result of the ping, host_setup will ping a second host machine, in this case parmgh 1 , and undertake a similar copy and renaming procedure. Finally, host_setup removes the device file j994tst0. 
     Next, check_system calls the function make_host( ). Make_host( ) appears on lines  3  through  33 . First, make_host( ) queries the user for the name of the system they would like to replace. This name is stored in a temporary variable. Make_host( ) then queries the system host file for the IP information corresponding to the name input by the user and concatenates the IP information and system name into a string which is stored in the variable sys. Contents of the variable sys are then printed and the user is queried to verify that the printed information is correct. If the information is correct, make_host stores the contents of the existing host file into a temporary host file and adds the contents of the variable sys to the end of the temporary host file. If the information is incorrect, an error message is printed indicating to the user that the operation is aborted due to the host file being incorrect. The existing host file is then renamed as host_old and the temporary host file is renamed as the existing host file. 
     If check_setup does not find the device, it assumes that the system is currently set up as a host workstation and that the user wishes to reconfigure the host workstation as a tester workstation. Consequently, check_system calls tester_setup. 
     Tester_setup appears on lines  67  through  92 . Tester_setup assumes that at least one of two specific tester computers are present on the network. Here the computers are named parmg 1  and parmg 2 . Tester_setup first pings parmg 1 . If parmg 1  answers, tester_setup will copy its kernel to a new file on the reconfigured workstation called vmunix_new. Tester_setup then renames the UNIX kernel to vmunix_online and renames vmunix_new to vmunix. If parmg 1  does not answer as a result of the ping, tester_setup will ping a second host machine, in the case parmg 2 , and undertake a similar copy and renaming procedure. Finally, tester_setup creates the device file j992tst0 by copying it the contents of the file j994tst0 online. 
     Next, check_system calls the function make_host( ), the results of which were explained earlier. 
     While this invention has been described with reference to the described embodiments, this is not meant to be construed in a limiting sense. Various modifications to the described embodiments, as well as additional embodiments of the invention, will be apparent to persons skilled in the art upon reference to this description. It is therefore contemplated that the appended claims will cover any such modifications or embodiments as fall within the true scope of the invention.