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How to preserve NFS file handles and volume MSIDs with SVM-DR (vserver disaster recovery)

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snapmirror
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Applies to

  • Clustered Data ONTAP 8.3      
  • ONTAP 9
  • SnapMirror
  • Storage Virtual Machine Disaster Recovery (SVM DR)

Description

This article describes on how to preserve NFS file handles and volume MSIDs with SVM-DR (vserver disaster recovery).

Volume MSIDs are not preserved with SVM-DR (vserver disaster recovery) in clustered Data ONTAP 8.3. In a disaster recovery scenario, NFS clients must re-mount the SVM namespace in order to gain access to the DR SVM even when using the -identity-preserve true option. Otherwise, these clients receive a stale file handle error message. For more information on using SVM-DR in clustered Data ONTAP 8.3, see KB clustered Data ONTAP 8.3 SVM Disaster Recovery Express Guide.

In ONTAP 9, SVM-DR relationships can now preserve volume MSIDs and FIDs. This allows NFS file handles to remain valid in a disaster recovery scenario without the need to re-mount.

The exception to this is, vserver root volumes. Vserver root volumes only preserve MSIDs and not file handles.

There are two types of SVM-DR relationships to consider when ensuring volume MSIDs and NFS file handles are preserved in ONTAP 9:

  • SVM-DR relationships newly-created in ONTAP 9
  • SVM-DR relationships that existed in clustered Data ONTAP 8.3 prior to upgrading to ONTAP 9

 

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