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@@ -64,7 +64,8 @@ In the SAP workload documentation space, you can find the following areas:
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## Change Log
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- November 07, 2022: Added HANA hook susChkSrv for scale-up pacemaker cluster in [High availability of SAP HANA on Azure VMs on SLES](sap-hana-high-availability.md), [High availability of SAP HANA Scale-up with ANF on SLES](sap-hana-high-availability-netapp-files-suse.md).
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- November 14, 2022: Change in [HA for SAP HANA scale-up with ANF on RHEL](./sap-hana-high-availability-netapp-files-red-hat.md) and [SAP HANA scale-out HSR with Pacemaker on Azure VMs on RHEL](./sap-hana-high-availability-scale-out-hsr-rhel.md) to update suggested timeouts for `FileSystem` Pacemaker cluster resources
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- November 07, 2022: Added HANA hook susChkSrv for scale-up pacemaker cluster in [High availability of SAP HANA on Azure VMs on SLES](sap-hana-high-availability.md), [High availability of SAP HANA Scale-up with ANF on SLES](sap-hana-high-availability-netapp-files-suse.md)
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- November 07, 2022: Added monitor operation for azure-lb resource in [High availability of SAP HANA on Azure VMs on SLES](sap-hana-high-availability.md), [SAP HANA scale-out with HSR and Pacemaker on SLES](sap-hana-high-availability-scale-out-hsr-suse.md), [Set up IBM Db2 HADR on Azure virtual machines (VMs)](dbms-guide-ha-ibm.md), [Azure VMs high availability for SAP NetWeaver on SLES for SAP Applications with simple mount and NFS](high-availability-guide-suse-nfs-simple-mount.md), [Azure VMs high availability for SAP NW on SLES with NFS on Azure File](high-availability-guide-suse-nfs-azure-files.md), [Azure VMs high availability for SAP NW on SLES with Azure NetApp Files](high-availability-guide-suse-netapp-files.md), [Azure VMs high availability for SAP NetWeaver on SLES](high-availability-guide-suse.md), [High availability for NFS on Azure VMs on SLES](high-availability-guide-suse-nfs.md), [Azure VMs high availability for SAP NetWeaver on SLES multi-SID guide](high-availability-guide-suse-multi-sid.md)
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- October 31, 2022: Change in [HA for NFS on Azure VMs on SLES](./high-availability-guide-suse-nfs.md) to fix script location for DRBD 9.0
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- October 31, 2022: Change in [SAP HANA scale-out with standby node on Azure VMs with ANF on SLES](./sap-hana-scale-out-standby-netapp-files-suse.md) to update the guideline for sizing `/hana/shared`
`OCF_CHECK_LEVEL=20` attribute is added to the monitor operation so that each monitor performs a read/write test on the filesystem. Without this attribute, the monitor operation only verifies that the filesystem is mounted. This can be a problem because when connectivity is lost, the filesystem may remain mounted despite being inaccessible.
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`OCF_CHECK_LEVEL=20` attribute is added to the monitor operation so that each monitor performs a read/write test on the filesystem. Without this attribute, the monitor operation only verifies that the filesystem is mounted. This can be a problem because when connectivity is lost, the filesystem may remain mounted despite being inaccessible.
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`on-fail=fence` attribute is also added to the monitor operation. With this option, if the monitor operation fails on a node, that node is immediately fenced. Without this option, the default behavior is to stop all resources that depend on the failed resource, then restart the failed resource, then start all the resources that depend on the failed resource. Not only can this behavior take a long time when an SAPHana resource depends on the failed resource, but it also can fail altogether. The SAPHana resource cannot stop successfully if the NFS server holding the HANA executables is inaccessible.
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`on-fail=fence` attribute is also added to the monitor operation. With this option, if the monitor operation fails on a node, that node is immediately fenced. Without this option, the default behavior is to stop all resources that depend on the failed resource, then restart the failed resource, then start all the resources that depend on the failed resource. Not only can this behavior take a long time when an SAPHana resource depends on the failed resource, but it also can fail altogether. The SAPHana resource cannot stop successfully if the NFS server holding the HANA executables is inaccessible.
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The suggested timeouts values allow the cluster resources to withstand protocol-specific pause, related to NFSv4.1 lease renewals. For more information see [NFS in NetApp Best practice](https://www.netapp.com/media/10720-tr-4067.pdf). The timeouts in the above configuration may need to be adapted to the specific SAP setup.
fstype=nfs options='defaults,rw,hard,timeo=600,rsize=262144,wsize=262144,proto=tcp,intr,noatime,sec=sys,vers=4.1,lock,_netdev' op monitor interval=20s on-fail=fence timeout=40s OCF_CHECK_LEVEL=20 \
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fstype=nfs options='defaults,rw,hard,timeo=600,rsize=262144,wsize=262144,proto=tcp,intr,noatime,sec=sys,vers=4.1,lock,_netdev' op monitor interval=20s on-fail=fence timeout=120s OCF_CHECK_LEVEL=20 \
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op start interval=0 timeout=120 op stop interval=0 timeout=120
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# clone the /hana/shared file system resources for both site1 and site2
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The `OCF_CHECK_LEVEL=20` attribute is added to the monitor operation, so that monitor operations perform a read/write test on the file system. Without this attribute, the monitor operation only verifies that the file system is mounted. This can be a problem because when connectivity is lost, the file system might remain mounted, despite being inaccessible.
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The `on-fail=fence` attribute is also added to the monitor operation. With this option, if the monitor operation fails on a node, that node is immediately fenced. Without this option, the default behavior is to stop all resources that depend on the failed resource, then restart the failed resource, and then start all the resources that depend on the failed resource. Not only can this behavior take a long time when an SAP HANA resource depends on the failed resource, but it also can fail altogether. The SAP HANA resource can't stop successfully, if the NFS share holding the HANA binaries is inaccessible.
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The `on-fail=fence` attribute is also added to the monitor operation. With this option, if the monitor operation fails on a node, that node is immediately fenced. Without this option, the default behavior is to stop all resources that depend on the failed resource, then restart the failed resource, and then start all the resources that depend on the failed resource. Not only can this behavior take a long time when an SAP HANA resource depends on the failed resource, but it also can fail altogether. The SAP HANA resource can't stop successfully, if the NFS share holding the HANA binaries is inaccessible.
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The suggested timeouts values allow the cluster resources to withstand protocol-specific pause, related to NFSv4.1 lease renewals. For more information see [NFS in NetApp Best practice](https://www.netapp.com/media/10720-tr-4067.pdf). The timeouts in the above configuration may need to be adapted to the specific SAP setup.
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1. **[1]** Configure and verify the node attributes. All SAP HANA DB nodes on replication site 1 are assigned attribute `S1`, and all SAP HANA DB nodes on replication site 2 are assigned attribute `S2`.
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