Static, dynamic, and snapshot image backup

The traditional image backup prevents write access to the volume by other system applications during the operation.

Use the dynamicimage option to back up the volume as is without remounting it read-only. Corruption of the backup can occur if applications write to the volume while the backup is in progress. In this case, run fsck after a restore.

The dynamicimage option is not supported for JFS2 volumes.

For Linux x86_64 clients only: By default, Tivoli® Storage Manager performs a snapshot image backup of file systems residing on a logical volume created by the Linux Logical Volume Manager during which the volume is available to other system applications. Snapshot image backup requires a Version 5.1 Tivoli Storage Manager server.

For AIX® clients only: By default, Tivoli Storage Manager performs a snapshot image backup of JFS2 volumes during which the volume is available to other system applications. AIX allows the creation of a snapshot of a JFS2 volume while it is still online. The snapshot is created inside the same volume group as the source volume. You must ensure that the volume group provides enough free disk space to create the snapshot. The snapshot contains the old data blocks while the modified data is stored in the source volume. Use the snapshotcachesize option with the backup image command, in the dsm.sys file, or with the include.image option to specify an appropriate snapshot size so that all old data blocks can be stored while the image backup occurs.

The Linux Logical Volume Manager allows the creation of a snapshot of a logical volume while the logical volume itself is still online. The snapshot is created inside the same volume group as the source logical volume. You must ensure that the volume group provides enough free disk space to create the snapshot. The snapshot contains the old data blocks while the modified data is stored in the source logical volume. Use the snapshotcachesize option with the backup image command, in the dsm.sys file, or with the include.image option to specify an appropriate snapshot size so that all old data blocks can be stored while the image backup occurs. A snapshot size of 100 percent will ensure a valid snapshot.