HP-UX 11i v3 Using LVM Logical Volume Snapshots (September 2010)

Figure 4: Deleting logical volumes on a snapshot tree

LV S1 S0

Deletion of a single snapshot can be a lengthy operation because of the unshare data copy. In

addition, the amount of data that is copied to the predecessor depends on the size of the logical

volume and the amount of data unshared on the logical volume being deleted.

To delete a snapshot and all its predecessors, use the lvremove -F option. Because the snapshot

and all its predecessors are deleted at the end of this operation, the shared data is not copied to the

snapshot predecessor. If the snapshot predecessors do not contain any valuable data or if all the

predecessors have been marked inoperative, HP recommends you use the -F option to delete all the

predecessors. The –F option is ignored if it is specified with the last predecessor on a snapshot tree.

For more information, see lvremove(1M).

Example

To delete all the snapshots of the original logical volume /dev/vg01/lvol1, follow these steps:

1. Identify the predecessor of the original logical volume using the Associated snapshots field of

lvdisplay output of the original logical volume as follows:

# lvdisplay /dev/vg01/lvol1

--- Logical volumes ---

LV Name /dev/vg01/lvol1

VG Name /dev/vg01

LV Permission read/write

LV Status available/syncd

Mirror copies 0

Consistency Recovery MWC

Schedule parallel

LV Size (Mbytes) 40

Current LE 10

Allocated PE 10

Stripes 0

Stripe Size (Kbytes) 0

Bad block NONE

Allocation strict

IO Timeout (Seconds) default

Number of Snapshots 3

Associated snapshots /dev/vg01/lvol1_S4

/dev/vg01/lvol1_S3

/dev/vg01/lvol1_S2

In this example, /dev/vg01/lvol1_S4 is the immediate predecessor of the original

logical volume.