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

lvdisplay command

The following new fields are added to the lvdisplay output of a logical volume with snapshots:

• Number of snapshots

Displays the number of snapshots associated with the logical volume. If the logical volume has no

snapshots configured, this value is 0.

• Associated snapshots

Displays a list of all the snapshots associated with this logical volume. The snapshots are listed in

the reverse order of snapshot creation; the oldest snapshot is displayed last in the list and the most

recent snapshot is displayed first in the list.

The following new or modified fields are added to the lvdisplay output of a snapshot

logical volume:

• LV Status

Indicates the type of snapshot logical volume. This is a modified field.

• Snapshot Status

Indicates whether a snapshot is operative, inoperative, or over-commit.

• Pre-allocated LE

Represents the total number of extents that have been pre-allocated for a space-efficient snapshot.

This field is not displayed for a fully-allocated snapshot.

• Current pre-allocated LE

Displays the number of logical extents currently present in the pre-allocated extents pool. This value

excludes those extents that have already been picked for unsharing. This field is not displayed for a

fully-allocated snapshot.

• Current pre-allocated PE

Represents the number of physical extents corresponding to Current pre-allocated LE and the

number of mirror copies of the space-efficient snapshot. This field is not displayed for a fully-

allocated snapshot.

• Unshared LE

Displays the number of extents of the snapshot logical volume that have been unshared.

• Original LV

Displays the name of the original logical volume of which this logical volume is a snapshot.

• Timestamp

Displays the time at which the snapshot was created.

• Unshared LE and unshared PE

In the distribution of logical volumes section, displays the number of unshared logical and physical

extents for each physical volume on which extents of the logical volume are mapped.

• Unshared Logical extents

Displays the mapping of all unshared logical extents to the corresponding physical extents. This

section is not displayed for a fully-allocated snapshot and if a space-efficient snapshot does not

have any unshared extents.

• Pre-allocated extents

Displays the extents that are currently present in the pre-allocated pool of the space-efficient

snapshot. This section is not displayed for a fully-allocated snapshot.

• Shared status

A new status in the Logical Extents section. Indicates the extent shares its data with its successor.

This status is displayed only for fully-allocated snapshots.