Excessive availability options on Microsoft Azure by SLES for SAP Purposes | Azure Weblog and Updates


This publish was co-authored with Sherry Yu, Director of SAP Success Architect, SUSE.

In at the moment’s enterprise world, service availability and reliability are key to a profitable digital transformation. Intensive downtime not solely prices a enterprise income and productiveness, however may trigger reputational injury. SUSE and Microsoft have been working intently to supply a trusted path to SAP Options within the cloud, together with options to scale back unplanned and deliberate downtime.

SUSE and Microsoft work collectively

SUSE is the chief in SAP Options, particularly the developer of excessive availability (HA) options. HA Options are first examined, supported on-premises, and documented within the official configuration guides which are revealed on SUSE’s website. Microsoft exams the options in Azure’s infrastructure, tunes the settings and configurations, then releases Azure-specific HA configuration guides on Microsoft’s documentation website. Microsoft actively gives suggestions and requests assist for brand new situations from SUSE. The working course of will be summarized within the chart under. It’s been a clean collaboration between SUSE and Microsoft to assist clients’ digital transformation journey.

Representation of the collaboration process used by SUSE and Microsoft to innovate, test and release support for high availability solutions for SAP.

Options to scale back unplanned downtime

Excessive availability options—that may forestall 24/7 SAP methods from being disrupted by numerous points brought on by {hardware}, community, and functions—are generally based mostly on cluster applied sciences. Pacemaker is an open supply cluster, utilized by numerous HA options.

For SAP HANA, the HA options are based mostly on HANA System Replication (HSR). SUSE has developed useful resource brokers to automate the failover of HANA System Replication in scale-up and scale-out situations.

For SAP S/4HANA and NetWeaver, the HA options are based mostly on ASCS/ERS enqueue replication. SUSE’s HA options for ENSA1 and ENSA2 are each licensed by SAP HA-Interface certification. Not too long ago SUSE launched a brand new structure known as Easy Mount File System, that reduces the complexity of the Pacemaker configuration for SAP ASCS/ERS structure. It’s additionally SAP HA-Interface licensed. Microsoft was the primary cloud supplier to launch a configuration information for SAP ASCS/ERS easy mount construction.

HA for SAP ASCS/ERS on Azure with SLES for SAP Purposes

The next configurations are supported on Azure based mostly on ASCS/ERS Enqueue Replication, ENSA1 and ENSA2, respectively:

The paragraph under outlines the main variations between the assorted situations:

Architectural diagram for high availability for SAP ASCS/ERS on Linux. It highlights the common elements of the HA solution (like Pacemaker cluster, ILB and so on), and depicts the different options for SAP shared directories –NFS on Azure files, or NFS on ANF or NFS cluster built by the customer.

New easy mount structure for SAP ASCS/ERS on Azure VMs with NFS

It is a new structure to simplify the administration of shared file methods on NFS. As an alternative of utilizing a FileSystem useful resource agent to handle the shared file methods by the cluster, shared file methods are managed by the OS and mounted at boot time. A brand new useful resource agent SAPStartSrv was created to manage the beginning and cease of the SAP begin framework of every SAP occasion. The profit is a extra strong cluster structure.

Representation of Pacemaker cluster resources in high availability configuration SAP ASCS/ERS. It shows the classic versus simple mount configuration.

This answer has been examined and launched on Microsoft Azure with the official configuration information revealed.

HA for SAP HANA on Azure with SLES for SAP Purposes

HA Options for SAP HANA are based mostly on HANA System Replication (HSR) in scale-up and scale-out. The next situations are supported on Azure:

 

There are some concerns in selecting the correct situation based mostly on your small business wants:

  • How vital is it to attenuate downtime within the case of a failover?
  • What’s the willingness to extend spend and/or decrease downtime, in case of incident?

Azure digital machine availability overview

Azure affords a number of compute deployment choices and it’s vital to grasp their variations, particularly the SLAs as famous under:

Representation of the Azure virtual machines (VMs) SLA for single VM, VMs deployed in Availability Set, and VMs deployed across Availability zones. Information about Disaster Recovery or DR regional pairs.

Options to scale back deliberate downtime

Deliberate downtime usually is related to upkeep of the surroundings. SUSE and Microsoft current the next options to attenuate the deliberate downtime.

As an illustration, when performing upkeep on a SAP HANA system operating in a cluster, whether or not it’s to improve of the OS or apply HANA SPs, it’s advisable to do a rolling replace. Meaning to improve the secondary HANA node first, carry out a takeover, then improve the previous main HANA node. It’s an efficient strategy to cut back the deliberate downtime to the time essential to carry out a takeover. The identical method will be utilized to SAP Central Companies in HA configuration.

To maintain the SAP methods safe, system admins should apply safety patches in a well timed method. Kernel Stay Patching is offered by SUSE to successfully assist keep away from reboots for as much as one yr. It’s extremely sensible and advisable for mission-critical HANA methods.

When performing upkeep to the SAP ASCS/ERS operating within the cluster, it’s important to leverage the sap_vendor_cluster_connector that SUSE has developed for the SAP HA-Interface certification, to keep away from split-brain. Throughout upkeep, a system admin can cease an SAP ASCS or ERS occasion by way of SAP instruments reminiscent of sapcontrol or MMC. If the occasion is managed by the cluster, by way of the cluster connector, the cluster will likely be notified that that is supposed and as an alternative of attempting to remediate the “failure,” the cluster is not going to intrude. The HA-Interface helps keep away from accidents throughout deliberate upkeep home windows. Yow will discover the small print and an instance on this weblog.

Speed up your SAP S/4HANA migration to Azure

SUSE and Microsoft present options to automate, validate and monitor the SAP Panorama:

•    Automation: Microsoft Automation Framework for SAP gives built-in finest practices to hurry up provisioning and cut back errors. Deployment time is lowered from months or weeks to days. SUSE as a contributing companion offered finest practices particularly for the HA deployment.

•    Validation: SUSE Undertaking Trento, a part of SLES for SAP Purposes, gives rule-based autodetection of SAP configuration points in Azure infrastructure. It may be used as a robust pre-go-live validation device to make sure high quality. In Day 2 operations it repeatedly checks the manufacturing system to detect deviation and forestall outage.

•    Monitoring: Microsoft Azure Monitor for SAP helps clients achieve insights into the SAP panorama, particularly HA clusters. The proactive monitoring helps to repair points earlier than outages occur. Monitor for clusters on SLES for SAP Purposes co-developed with SUSE.

SLES for SAP Purposes

SLES for SAP Purposes is the main Linux platform for SAP HANA, SAP NetWeaver, and SAP S/4HANA options and is an SAP Endorsed App. Two of the numerous key elements of SLES for SAP Purposes are the Excessive Availability Extension and Useful resource Brokers. The Excessive Availability Extension gives Pacemaker, an open-source cluster framework. The Useful resource Brokers handle automated failover of SAP HANA System Replication, S/4HANA ASCS/ERS ENSA2, and NetWeaver ASCS/ERS ENSA1. On Microsoft Azure’s market, the PAYG picture of SLES for SAP Purposes contains Stay Patching.

Be taught Extra

Microsoft Azure is an enterprise-class cloud platform optimized for SAP that gives important price financial savings, new insights from superior analytics, and unmatched safety and compliance.

SUSE has greater than 20 years in SAP Partnership with greater than 130 worldwide benchmarks. Among the world’s largest SAP workloads run on SUSE on Azure. The primary reference architectures for SAP on Azure have been SUSE based mostly. Because of the shut collaboration between Microsoft and SUSE, a complete portfolio of HA Options for SAP on Azure is obtainable for purchasers, leveraging the strengths of SUSE on Microsoft Azure.

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