HP-UX Reference (11i v2 07/12) - 1M System Administration Commands A-M (vol 3)

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lvsync(1M) lvsync(1M)

(Requires Optional HP MirrorDisk/UX Software)

NAME

lvsync - synchronize stale mirrors in LVM logical volumes

SYNOPSIS

/usr/sbin/lvsync

[-T] lv_path ...

Remarks

This command requires the installation of the optional HP MirrorDisk/UX software (not included in the

standard HP-UX operating system) before it can be used.

DESCRIPTION

The

lvsync command synchronizes the physical extents of each logical volume speciﬁed by lv_path. Syn-

chronization occurs only on physical extents that are stale mirrors of the original logical extent. The syn-

chronization process can be time consuming, depending on the hardware characteristics and the amount of

data.

Arguments

lvsync recognizes the following argument:

lv_path The block device path name of a mirrored logical volume.

-T Perform mirror synchronization of logical volumes within a volume group using

multiple parallel threads. Logical volumes belonging to different volume groups

will be synchronized serially. It is possible that logical volumes start and/or com-

plete their synchronization in a different order than speciﬁed on the command

line.

The maximum number of threads used can be controlled using the

PTHREAD_THREADS_MAX

system tunable.

NOTE: This option has no effect if the volume group is activated in shared

mode.

EXTERNAL INFLUENCES

Environment Variables

LANG determines the language in which messages are displayed.

If LANG is not speciﬁed or is null, it defaults to "C" (see lang(5)).

If any internationalization variable contains an invalid setting, all internationalization variables default to

"C" (see environ(5)).

EXAMPLES

Synchronize the mirrors on a logical volume:

lvsync /dev/vg01/lvol5

Synchronize the mirrors on three logical volumes using multiple parallel threads:

lvsync -T /dev/vg02/lvol1 /dev/vg02/lvol2 /dev/vg02/lvol3

Add mirror copies using lvextend with the -s option for three logical volumes, and then synchronize

mirrors on these three logical volumes using multiple parallel threads.

First, add mirror copies to each logical volume using lvextend with the -s option:

lvextend -m 1 -s /dev/vg03/lvol1

lvextend -m 2 -s /dev/vg03/lvol2

lvextend -m 2 -s /dev/vg03/lvol3

Now synchronize the mirrors on these three logical volumes using multiple parallel threads:

lvsync -T /dev/vg03/lvol1 /dev/vg03/lvol2 /dev/vg03/lvol3