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