LVM2 and JFS2
When you run a Db2® backup
operation, Db2 requests a snapshot. This
snapshot is created on a Logical Volume Management (LVM) system or a Journaled File System (JFS) for
each logical volume with data or logs for the selected database. In Linux systems, the logical volumes are managed by LVM2 with
commands. On AIX®, the logical volumes are managed by JFS2 and
created with the JFS2 snapshot command as external snapshots.
A software-based LVM2 or JFS2 snapshot is taken as a new logical volume on the same volume group. The snapshot volumes are temporarily mounted on the same machine that runs the Db2 instance so that they can be transferred to the vSnap repository.
On Linux, the LVM2 volume manager stores the snapshot of a logical volume within the same volume group. On AIX, the JFS2 volume manager stores the snapshot of a logical volume within the same volume group. For both, there must be enough space on the machine to store the logical volume. The logical volume grows in size with data as it changes on the source volume while the snapshot exists.