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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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`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
@@ -808,7 +808,10 @@ For the next part of this process, you need to create file system resources. Her
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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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