Index from snapshot for D-NAS
The index from snapshot operation indexes the contents of the existing snapshots. When NetBackup indexes a snapshot, it creates an image catalog file in the NetBackup catalog for each snapshot. This image catalog file assists you when you restore a file from the snapshot.
Note:
The index of a NAS share that uses NFS protocol on a Linux host is faster as compared to the SMB protocol on Windows hosts. It is recommended to enable mixed protocols for the NAS share on the storage array and use NFS protocol (using Linux host) for the index operation.
The backup from snapshot operation also creates an image catalog file. If a backup from snapshot occurs frequently for the restore job in the environment, then an index from snapshot is not required.
For example, if the backup from snapshot runs once per week but the file restores are required daily, consider using index from snapshot.
Starting with NetBackup version 10.4, you can perform index from snapshot operation of a NAS share using two streams.
The index from snapshot operation can run from a full or an incremental schedule.
For index from snapshot operations, a volume uses one or two streams. This is unlike backup from snapshot operations.
A single SLP can have either index from snapshot or backup from snapshot operation, but not both.
Location of image catalog (. f) is:
<NetBackup Installation directory>/db/images/<StorageArrayFiler>/<directory>To dump or check the contents of the image catalog, use the cat_convert utility as follows:
: /usr/openv/netbackup/bin/cat_convert -dump <. f file name>
NetBackup primary server, media server, and backup hosts must be of version 10.4 or higher to use multistream index from snapshot.
By default, NetBackup uses one stream per NAS share for the index from snapshot operation.
Note:
The index of a NAS share is faster when you use the NFS protocol as compared to using the SMB protocol. It is recommended to enable mixed protocols for the NAS share on the storage array and use the NFS protocol (using Linux host) for the index operation.