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How to preserve NFS file handles and volume MSIDs with SVM-DR

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Applies to

  • 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).
  • In ONTAP 9, SVM-DR relationships 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 earlier ONTAP versions, prior to upgrading to ONTAP 9

Volume MSIDs are not preserved with SVM-DR (vserver disaster recovery) in ONTAP versions prior to ONTAP 9

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.

 

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