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


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

    In immediately’s enterprise world, service availability and reliability are key to a profitable digital transformation. In depth downtime not solely prices a enterprise income and productiveness, however might also trigger reputational harm. SUSE and Microsoft have been working carefully 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 checks 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 help for brand spanking new eventualities from SUSE. The working course of might be summarized within the chart under. It’s been a easy collaboration between SUSE and Microsoft to help prospects’ 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 programs from being disrupted by varied points attributable to {hardware}, community, and functions—are generally primarily based on cluster applied sciences. Pacemaker is an open supply cluster, utilized by varied HA options.

    For SAP HANA, the HA options are primarily based 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 eventualities.

    For SAP S/4HANA and NetWeaver, the HA options are primarily based on ASCS/ERS enqueue replication. SUSE’s HA options for ENSA1 and ENSA2 are each licensed by SAP HA-Interface certification. Lately 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 Functions

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

    The paragraph under outlines the most important variations between the varied eventualities:

    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 programs on NFS. As a substitute of utilizing a FileSystem useful resource agent to handle the shared file programs by the cluster, shared file programs 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 sturdy cluster structure.

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

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

    HA for SAP HANA on Azure with SLES for SAP Functions

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


    There are some issues in selecting the correct situation primarily based on your enterprise wants:

    • How vital is it to reduce 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 setting. SUSE and Microsoft current the next options to reduce the deliberate downtime.

    For example, when performing upkeep on a SAP HANA system working in a cluster, whether or not it’s to improve of the OS or apply HANA SPs, it’s really helpful to do a rolling replace. Meaning to improve the secondary HANA node first, carry out a takeover, then improve the previous major HANA node. It’s an efficient method to scale back the deliberate downtime to the time essential to carry out a takeover. The identical method might be utilized to SAP Central Providers in HA configuration.

    To maintain the SAP programs safe, system admins should apply safety patches in a well timed method. Kernel Dwell Patching is supplied by SUSE to successfully assist keep away from reboots for as much as one 12 months. It’s extremely sensible and really helpful for mission-critical HANA programs.

    When performing upkeep to the SAP ASCS/ERS working 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 through SAP instruments equivalent to sapcontrol or MMC. If the occasion is managed by the cluster, through the cluster connector, the cluster will probably be notified that that is meant and as a substitute of attempting to remediate the “failure,” the cluster won’t 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 scale back errors. Deployment time is decreased from months or weeks to days. SUSE as a contributing associate supplied finest practices particularly for the HA deployment.

    •    Validation: SUSE Challenge Trento, a part of SLES for SAP Functions, gives rule-based autodetection of SAP configuration points in Azure infrastructure. It may be used as a strong pre-go-live validation instrument 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 prospects acquire 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 Functions co-developed with SUSE.

    SLES for SAP Functions

    SLES for SAP Functions 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 Functions 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 Functions contains Dwell Patching.

    Study 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. A number of the world’s largest SAP workloads run on SUSE on Azure. The primary reference architectures for SAP on Azure had been SUSE primarily based. Because of the shut collaboration between Microsoft and SUSE, a complete portfolio of HA Options for SAP on Azure is out there for purchasers, leveraging the strengths of SUSE on Microsoft Azure.


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