- ONTAP 9.1 and later
- SVM Disaster Recovery destination in "stopped" state
- NDMP backup of SVM Disaster Recovery destination
- When a SVM (or vserver) is in a stopped state, the SVM NAS protocols (CIFS or NFS) are inactive, and the SVM is not serving data via its Data LIFs.
- NDMP is not a NAS protocol, so the state of the NAS protocols does not impact the ability to perform NDMP backup / restore.
- If the volume(s) being backed up are available, then NDMP can back them up. If the volume(s) are not accessible, NDMP cannot back them up. This applies to all NDMP backup scenarios, not just NDMP backup of SVM DR.
- What determines if a volume is accessible depends on who, or what, is accessing it, combined with the access method:
- From the perspective of a user or application, a Data LIF is needed to access the data. When a SVM is stopped, users and applications do not have access to the data, because data is not being served.
- From the perspective of ndmpd operating at the cluster level, all volumes in the cluster are accessible. Ndmpd, and NDMP protocol, are independent of the NAS protocols.
- Unlike a CIFS or NFS client, NDMP does not require a Data LIF to access volumes. NDMP can use InterCluster and management LIFs, in addition to Data LIFs.
- From the perspective of a backup application, which volumes are accessible will depend on how the application connects to the cluster, and how the application authenticates.
- The NDMP server and backup application will have access to all volumes in the cluster, including volumes owned by SVMs in a stopped state, if:
- NDMP is configured at the cluster level
- The backup application is connecting to the cluster mgmt LIF
- The backup application is authenticating to the admin vserver
- The backup application will not have access to volumes owned by a SVM in a stopped state if:
- NDMP is configured at the data SVM level, rather than cluster level
- The backup application is connecting to a LIF owned by the data SVM
- The backup application is authenticating to NDMP at the data SVM level
Considerations for NDMP indirect (remote) or 3-way topology
In a indirect or 3-way topology, the NDMP data stream is sent over the network
Sending the NDMP data stream over the network requires a NDMP data connection LIF
If no suitable LIF is available to use for the data connection, the backup or restore will fail, even if the volume is available
Ensure a suitable LIF is available on the node hosting the volume that is being backed up or restored
Note: In a local topology, the NDMP data stream is sent to local tape. The above considerations do not apply to a local topology.
- If the volume is available/accessible to ndmpd and the backup application, it can be backed up
- If the volume is not available or accessible, it cannot be backed up
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