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.