You have to take into account a list of considerations when starting the NDMP service on your storage system.
- A storage system supports a maximum of 32 SMTape sessions over a TCP/IP network.
- NDMP backup applications require specification of a target system password.
To enable successful authentication by NDMP services on the storage system, you must use either the storage system’s root password or a system-generated NDMP-specific password (to authenticate a non-root user or administrator).
- NDMP services can generate file history data at the request of NDMP backup applications.
File history is used by backup applications to enable optimized recovery of selected subsets of data from a backup image. File history generation and processing might be time-consuming and CPU-intensive for both the storage system and the backup application.
Note: SMTape does not support file history.
If your data protection needs are limited to disaster recovery, where the entire backup image will be recovered, you can disable file history generation to reduce backup time. See your backup application documentation to determine if it is possible to disable NDMP file history generation.
Note: When your data protection needs are limited to disaster recovery, it is recommended that you use SMTape to back up data.
- When a SnapMirror destination is backed up to tape, only the data on the volume is backed up.
The SnapMirror relationships and the associated metadata are not backed up to tape. Therefore, during restore, only the data on that volume is restored and the associated SnapMirror relationships are not restored.
