vania-janet/multiturn-rag-retrieval-data huggingface dataset:
Configuring high availability for stateless applications 

This topic is a high-level summary of high availability for stateless applications, such as a front-end application that is deployed on the IBM Cloud® infrastructure layer (IaaS). Stateless applications don't store persistent data, but are still required to meet a service level for high availability.



 Data Centers, Regions, and Availability Zones 

As an IBM classic infrastructure (non-VPC) customers you can order bare metal or virtual server instances and can deploy to over 60 data centers that are located around the world in addition to several multi-zone regions with multiple availability zones.

The data centers are in different geographies, countries, and regions. Whether the data centers are multi-zone (MZR) or not, all of them maintain multiple power feeds, fiber links, dedicated generators, and battery backup to avoid a single-point-of-failure (SPOF) between zones and regions. While all the data centers have multiple power feeds, several of the more mature sites such as AMS01, DAL05, 06, 08. FRA02. HKG02, MEX01, MIL01, PAR01,SJC01, SNG01, WDC01, and WDC03 have some 1U single socket server chassis that might not accommodate a dual power feed. If you have a 1U single socket server in one of these sites, you might want to consider a 2U chassis with redundant power supplies. For more information about availability zones, see [Locations for resource deployment](https://cloud.ibm.com/docs/overview?topic=overview-locations).

The advantage of an MZR is that it provides consistent cloud services across the different zones, better resiliency, availability, higher interconnect speed between data centers for cloud platforms, and infrastructure services such as IBM Cloud® Object Storage, and IBM Cloud load balancers. These features can be critical to your applications. Deploying the application in an MZR rather than a single zone can increase the availability from 3 9’s to 5 9’s when deployed over three zones.



 PODs 

IBM Cloud data centers are also based on POD architecture where each data center can have more than one POD, depending on on-demand buildout.
* SAP Web Dispatcher. For more information, see [ASCS Instance with Integrated SAP Web Dispatcher](https://help.sap.com/viewer/910828cec5d14d6685da380aec1dc4ae/CURRENT_VERSION/en-US/2e708e2d42134b4baabdfeae953b24c5.html).
* Gateway. For more information, see [ASCS Instance with Integrated Gateway](https://help.sap.com/viewer/ce9e270ad34949969c16d09d1b099a26/CURRENT_VERSION/en-US/bf1d359ac8384441a781ae3b0b5bd1b5.html).



Architecture of SAP NetWeaver AS for JAVA



1. Java central instance (J< nn > instance) – A Java instance is a unit in the AS Java cluster that is identified by its instance number. The elements that form an instance that is run on one physical machine. Also, it is possible to run several instances on one physical machine, but it is recommended that you split the different instances among different physical machines. A [Java Central Instance](https://help.sap.com/viewer/5bdacafd0bbd41648f4b80093a1bf9d6/7.5.4/en-US/4b1bb795eb2770d3e10000000a42189b.html) consists of:



* Internet Communication Manager (ICM) - The ICM is an element of the Java instance that handles requests coming from clients and dispatches them to the available server processes. Data is transferred from the ICM to the server processes and vice versa by using the Fast Channel Architecture (FCA), which allows fast and reliable communication between them
* One or several server processes - The server processes of AS Java run the Java application. They are responsible for processing incoming requests that are assigned to them by the ICM. Each server process is multi-threaded, and can therefore process many requests simultaneously.



2.
They are responsible for processing incoming requests that are assigned to them by the ICM. Each server process is multi-threaded, and can therefore process many requests simultaneously.



2. System Central Services instance (SCS instance) - Central services form the basis of communication and synchronization for the AS Java cluster. They are responsible for lock administration, message exchange, and load balancing within the cluster. Central services that are run on one physical machine and constitute a separate instance. This [SAP Central Services Instance (SCS)](https://help.sap.com/viewer/5bdacafd0bbd41648f4b80093a1bf9d6/7.4.19/en-US/480728f74c6a3837e10000000a42189b.html) comprises:



* Message Server - The message server keeps a list of all server processes in the AS Java cluster and provides information about their availability to Internet Communication Manager (ICM). It also represents the infrastructure for data exchange between the participating server processes.
* Enqueue Server - The enqueue server manages logical locks. The enqueue server runs on the Central Services instance of the Java cluster. It manages the lock table in the main memory and receives requests for setting or releasing locks. It maps the logical locks to the database.





Sybase for standard system



* Database instance (DB) - SAP Adaptive Server Enterprise (SAP ASE) in this case. The SAP systems in a landscape have specific requirements for servers, operating systems, network setup, and supported storage. Deployment of SAP AnyDB on IBM Cloud is similar to deployments with infrastructure with on-premises data centers. Therefore, use the information that is provided from SAP and the RDBMS providers. For more information, see [SAP AnyDB - SAP ASE](https://cloud.ibm.com/docs/sap?topic=sap-anydb-sap-ase) and [Infrastructure certified for SAP](https://cloud.ibm.com/docs/sap?topic=sap-iaas-offerings).
The following table shows all Balanced profiles available for the IBM Z or LinuxONE (s390x architecture) processors.

Ensure that you select a secure execution enabled profile (for example, cz2e-2x4) when you enable the Run your workload with an OS and a profile protected by Secure Execution toggle (to activate support for secure execution images). Selecting any profile that is not secure execution enabled will cause the deployment of the virtual instance to fail.

s390x

s390x with secure execution



Table 2. Balanced profiles options for s390x instances
Balanced profiles options for IBM Z or LinuxONE s390x virtual server instances.

 Instance profile vCPU Cores GiB RAM Bandwidth Cap (Gbps) 

 bz2-1x4 1 <br><br> * <br><br><br> 4 2 
 bz2-2x8 2 1 8 4 
 bz2-4x16 4 2 16 8 
 bz2-8x32 8 4 32 16 
 bz2-16x64 16 8 64 32 







 Compute 

Compute profiles are best for workloads with intensive CPU demands, such as high web traffic workloads, production batch processing, and front-end web servers that can benefit from 2 GiB of memory for every 1 vCPU of compute. The following table shows all Compute profiles available for the IBM Z or LinuxONE (s390x architecture) processors.

Ensure that you select a secure execution enabled profile (for example, cz2e-2x4) when you enable the Run your workload with an OS and a profile protected by Secure Execution toggle (to activate support for secure execution images). Selecting any profile that is not secure execution enabled will cause the deployment of the virtual instance to fail.

s390x

s390x with secure execution



Table 3. Compute profiles options for s390x instances
Compute profiles options for IBM Z or LinuxONE s390x virtual server instances.

 Instance profile vCPU Cores GiB RAM Bandwidth Cap (Gbps) 

 cz2-2x4 2 1 4 2 
 cz2-4x8 4 2 8 8 
 cz2-8x16 8 4 16 16
ux2d-100x2800 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2618)<br><br><br> 
 ux2d-200x5600 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2619)<br><br><br> 
 vx2d-16x224 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2624)<br><br><br> 
 vx2d-44x616 IBM Cloud Virtual Server <br><br> * [OLAP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2603)<br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2623)<br><br><br>
Availability policy on host failure restart
Startable true
Profile bx2-2x8
Architecture amd64
vCPUs 2
Memory(GiB) 8
Bandwidth(Mbps) 4000
Volume bandwidth(Mbps) 1000
Network bandwidth(Mbps) 3000
Lifecycle Reasons Code Message
- -

Lifecycle State stable
Metadata service Enabled Protocol Response hop limit
false http 1

Image ID Name
r134-1025e040-7d6f-408c-b4db-6156dc986fc7 ibm-ubuntu-22-04-1-minimal-amd64-2

Numa Count 1
VPC ID Name
r134-ac1c1ae4-5573-42eb-9194-854c9a3d5555 fode

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Show more



 Disable auto link 

You can disable auto link for the instance metadata service when provisioning an instance. Auto link is enabled by default when a trusted profile is selected. When autolink is enabled, the specified trusted profile is automatically linked to the virtual server instance when the instance is provisioned. An instance provisioned with auto link the trusted profile is available to the instance immediatley at startup. When auto link is disabeld, the specified trusted profile must be linked to the instance for it to be used by the instace.

To disable auto link, set the --default-trusted-profile-auto-link option to true when provisioning an instance. The following example shows instance the provision command with auto link set to false.

ibmcloud is instance-create .... --default-trusted-profile "Profile-9fd84246-7df4-4667-94e4-8ecde51d5ac5" --default-trusted-profile-auto-link false





 Enable secure access by using the CLI 

You can enable secure access to the instance metadata service. When secure access is enabled, the metadata service is accessible only to the virtual server instance by encrypted HTTP Secure protocol (HTTPS).
Instances View, List Viewer for the instance 
 Instances Post IP Spoofing Operator for instance 
 Instances Create console Operator and Console Administrator for the instance 
 Instance actions Create, Update, Delete Operator for the instance 
 Instance actions View, List Viewer for the instance 
 Instance storage View, List Viewer for the instance 
 Instance storage Update name Editor for the instance 
 Interfaces View, List Viewer for the instance 
 Interface's floating IP View, List Viewer for the instance and the floating IP 
 Instance's floating IP Associate Editor for the instance<br><br>Operator for the floating IP 
 Instance's floating IP Disassociate Editor for the instance 
 Volume attachments View, List Viewer for the instance 
 Volume attachments Create Editor for the Instance and volume 
 Volume attachments Update, Delete Editor for the instance 
 ———————— ————————— ———————— 
 Dedicated host group Create, Update, Delete Editor for the dedicated host group 
 Dedicated host group View, List Viewer for the dedicated host group 
 Dedicated host group Create an instance in Operator for the dedicated host group 
 Dedicated host Create Editor for the dedicated host<br><br>Editor for the dedicated host group 
 Dedicated host Update, Delete Editor for the dedicated host 
 Dedicated host View, List Viewer for the dedicated host 
 Dedicated host Create an instance on Operator for the dedicated host 
 ———————— ————————— ———————— 
 Bare metal server View, List Viewer for the bare metal server 
 Bare metal server Update, Delete Editor for the bare metal server 
 Bare metal server Create Editor for the bare metal server<br><br>Advanced Network Operator for the bare metal server<br><br>Subnet Editor<br><br>Operator for the security group<br><br>Operator for VPC<br><br>Operator for Key<br><br>Operator for Image 
 Bare metal server IP spoofing, Infrastructure NAT Advanced Network Operator for the bare metal server 
 Bare metal server Operate (Restart, Start, Stop, Retrieve initialization data) Operator for the bare metal server
Availability policy on host failure restart
Startable true
Profile bx2-2x8
Architecture amd64
vCPUs 2
Memory(GiB) 8
Bandwidth(Mbps) 4000
Volume bandwidth(Mbps) 1000
Network bandwidth(Mbps) 3000
Lifecycle Reasons Code Message
- -

Lifecycle State stable
Metadata service Enabled Protocol Response hop limit
false http 1

Image ID Name
r134-1025e040-7d6f-408c-b4db-6156dc986fc7 ibm-ubuntu-22-04-1-minimal-amd64-2

Numa Count 1
VPC ID Name
r134-ac1c1ae4-5573-42eb-9194-854c9a3d5555 fode

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 Disable auto link 

You can disable auto link for the instance metadata service when provisioning an instance. Auto link is enabled by default when a trusted profile is selected. When autolink is enabled, the specified trusted profile is automatically linked to the virtual server instance when the instance is provisioned. An instance provisioned with auto link the trusted profile is available to the instance immediatley at startup. When auto link is disabeld, the specified trusted profile must be linked to the instance for it to be used by the instace.

To disable auto link, set the --default-trusted-profile-auto-link option to true when provisioning an instance. The following example shows instance the provision command with auto link set to false.

ibmcloud is instance-create .... --default-trusted-profile "Profile-9fd84246-7df4-4667-94e4-8ecde51d5ac5" --default-trusted-profile-auto-link false





 Enable secure access by using the CLI 

You can enable secure access to the instance metadata service. When secure access is enabled, the metadata service is accessible only to the virtual server instance by encrypted HTTP Secure protocol (HTTPS).
mx2d-metal-96x768 IBM Cloud Bare Metal Server on VPC <br><br> * [OLAP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2678)<br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2677)<br><br><br> 
 bh1-16x1600 IBM Power Virtual Server <br><br> * [OLAP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2358)<br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2451)<br><br><br> 
 bh1-30x3000 IBM Power Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2452)<br> * [OLAP Scale-Out Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2565)<br><br><br>
ux2d-16x448 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2614)<br><br><br> 
 ux2d-36x1008 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2615)<br><br><br> 
 ux2d-48x1344 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2616)<br><br><br> 
 ux2d-72x2016 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2617)<br><br><br> 
 ux2d-100x2800 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2618)<br><br><br> 
 ux2d-200x5600 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2619)<br><br><br>
For more information about the available block and file storage classes you use with each of the supported storage solutions, see the table of Storage requirements under Information you need to complete this task on the page "Installing Watson Speech services" in [Watson Speech services on IBM Cloud Pak for Data](https://www.ibm.com/docs/en/cloud-paks/cp-data/4.6.x?topic=services-watson-speech).

Additional information about provisioning a service instance
: The documentation now includes information about creating a service instance programmatically. It also includes examples of listing service instances and deleting a service instance. For more information, see Creating a Watson Speech services instance in the Post-installation setup documentation in [Watson Speech services on IBM Cloud Pak for Data](https://www.ibm.com/docs/en/cloud-paks/cp-data/4.6.x?topic=services-watson-speech).

Server-side encryption is enabled for the MinIO datastore
: The Speech services have now enabled server-side encryption for object storage in the MinIO datastore. No action is required on your part.

Change to audit webhooks
: The Speech services have now removed the audit webhook dependency. The services now write audit events directly to the server. After upgrading to version 4.6.2, some webhook resources might remain until all services can remove the dependency. The remaining resources will be removed in a future release. No action is required on your part.

New US English expressive neural voices
: The service offers four new expressive neural voices for US English:



* en-US_AllisonExpressive
* en-US_EmmaExpressive
* en-US_LisaExpressive
* en-US_MichaelExpressive



Expressive neural voices offer natural-sounding speech that is exceptionally clear, crisp, and fluid. The new voices are generally available (GA) for production use. They support the use of both standard International Phonetic Alphabet (IPA) and IBM Symbolic Phonetic Representation (SPR) phonetic symbols. For more information, see
mx2-32x256 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2370)<br> * [Business One Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2419)<br><br><br> 
 mx2-48x384 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2371)<br> * [Business One Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2420)<br><br><br> 
 ux2d-8x224 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2613)<br><br><br> 
 ux2d-16x448 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2614)<br><br><br> 
 ux2d-36x1008 IBM Cloud Virtual Server <br><br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2615)<br><br><br>
For details, see [Using load balancers](https://cloud.ibm.com/docs/vpc?topic=vpc-load-balancers).







 13 February 2020 

Red Hat Enterprise Linux (RHEL) and Windows stock images are now available
: Provision an instance that uses an RHEL image or a Windows® image in the Dallas region. For more information, see [Images](https://cloud.ibm.com/docs/vpc?topic=vpc-about-images).





 10 February 2020 

API change notification
: We have temporarily suspended API support for creating new instances from an existing boot volume. For more information, see t[API change log](https://cloud.ibm.com/docs/vpc?topic=vpc-api-change-log).





 03 February 2020 

IBM virtual servers for VPC on POWER (Beta)
: The beta is now open to anyone interested, no signup necessary. For more information, see the following resources:



* [Profiles](https://cloud.ibm.com/docs/vpc?topic=vpc-profiles)



Red Hat Enterprise Linux (RHEL) and Windows stock images are now available
: Provision an instance that uses an RHEL image or a Windows® image in the Washington DC region. For more information, see [Images](https://cloud.ibm.com/docs/vpc?topic=vpc-about-images).

UI enhancements
: The modals for provisioning and attaching a public gateway and for creating an SSH key are now replaced with a redesigned side pane.







 January 2020 



 10 January 2020 

New Washington DC region
: The Washington DC region endpoint (us-east) is now in service at http://us-east.iaas.cloud.ibm.com. For more information, see [Endpoint URLs](https://cloud.ibm.com/apidocs/vpcendpoint-url) in the IBM Cloud VPC API.
[Compute](https://cloud.ibm.com/docs/virtual-servers?topic=virtual-servers-about-virtual-server-profilescompute) Best for moderate to high web traffic workloads. 
 [Memory](https://cloud.ibm.com/docs/virtual-servers?topic=virtual-servers-about-virtual-server-profilesmemory) Best for memory caching and real-time analytics workloads. 





 Notifications 

When configured, you can receive automated reclaim notifications that help you prepare and reduce lost data. For more information, see [Configuring automated reclaim notifications](https://cloud.ibm.com/docs/virtual-servers?topic=virtual-servers-configuring-notifications-for-reclaims-of-transient-virtual-serversconfiguring-notifications-for-reclaims-of-transient-virtual-servers).





 Limitations 

Consider the following limitations before you provision a transient virtual server.



* The number of supported, concurrent instances are part of your account-wide device quota. For more information about concurrent instance limits, see [FAQ: Virtual servers](https://cloud.ibm.com/docs/virtual-servers?topic=virtual-servers-faqs-virtual-serversfaqs-virtual-servers).
* Transient instances cannot be upgraded or downgraded.
* Resources can be reclaimed at any time, without notification.
* Transient instances cannot use local storage.
* Transient instances cannot use GPU-based or variable compute profiles.







 Next steps 

After you review and select your virtual server profile, it's time to provision your transient virtual server. To get started, see [Provisioning transient instances](https://cloud.ibm.com/docs/virtual-servers?topic=virtual-servers-ordering-vs-transientordering-vs-transient).
ch1-60x3000 IBM Power Virtual Server 21,000 Up to 8 nodes:   7 active nodes (1 parent, 6 worker nodes) and 1 standby node TDI OLAP 210 1,680 n/a n/a 







 Do you have a full list of Profiles on the SAP HANA Hardware Directory? 

For a full list of all SAP HANA Directory records for each certified Infrastructure-as-a-Service Profile specifications in the IBM Cloud® for SAP portfolio (including complementary offerings from IBM Power Systems), see the following table:



Table 4. Full list of profiles on SAP HANA Hardware Directory

 Profile IaaS Type SAP HANA Directory 

 BI.S3.H2.192 IBM Cloud Bare Metal (Local SSD) <br><br> * [OLAP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2019)<br> * [OLTP Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2256)<br> * [Business One Record](https://www.sap.com/dmc/exp/2014-09-02-hana-hardware/enEN//solutions?filters=iaas&id=s:2201)<br><br><br>