lvmerge(1M) lvmerge(1M)
Requires Optional HP MirrorDisk/UX Software
NAME [Toc] [Back]
lvmerge - merge two LVM logical volumes into one logical volume
SYNOPSIS [Toc] [Back]
/usr/sbin/lvmerge [-A autobackup] dest_lv_path src_lv_path
Remarks [Toc] [Back]
This command requires the installation of the optional HP MirrorDisk/UX
software, which is not included in the standard HP-UX operating system.
lvmerge cannot be performed if the volume group is activated in shared
mode.
DESCRIPTION [Toc] [Back]
The lvmerge command merges two logical volumes of the same size. The
number of mirrored copies of the dest_lv_path is increased by the
number of copies in the src_lv_path.
Data previously contained in the dest_lv_path is resynchronized using
the data in the src_lv_path. All new data on the dest_lv_path is
destroyed.
Whenever a mirrored logical volume is split into two logical volumes,
a bit map is stored that keeps track of all writes to either logical
volume in the split pair. When the two logical volumes are
subsequently merged using lvmerge, the bit map is used to decide which
areas of the logical volumes need to be resynchronized. This bit map
continues to exist until the merge is completed, or one of the logical
volumes is extended or reduced, or the system is rebooted.
If there is no bit map available, the entire logical volume is
resynchronized.
The normal usage for this command is to merge previously mirrored
logical volumes that have been split using the lvsplit command (see
lvsplit(1M). However, the two logical volumes are not required to
have been the result of a previous lvsplit operation.
Options and Arguments [Toc] [Back]
lvmerge recognizes the following options and arguments:
dest_lv_path The block device path name of a logical
volume.
src_lv_path The block device path name of a logical
volume.
-A autobackup Set automatic backup for this invocation of
this command. autobackup can have one of the
following values:
Hewlett-Packard Company - 1 - HP-UX 11i Version 2: August 2003
lvmerge(1M) lvmerge(1M)
Requires Optional HP MirrorDisk/UX Software
y Automatically back up configuration
changes made to the logical volume.
This is the default.
After this command executes, the
vgcfgbackup command (see
vgcfgbackup(1M)) is executed for
the volume group to which the
logical volume belongs.
n Do not back up configuration
changes this time.
EXTERNAL INFLUENCES [Toc] [Back]
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 [Toc] [Back]
Merge /dev/vg00/lvol1b with /dev/vg00/lvol1: Data in /dev/vg00/lvol1b
will be overridden by /dev/vg00/lvol1.
lvmerge /dev/vg00/lvol1b /dev/vg00/lvol1
WARNINGS [Toc] [Back]
If no bit map is found, all data on dest_lv_path is lost after the
merge.
lvmerge does not check to guarantee that the allocation policy of
src_lv_path is preserved after the merge.
SEE ALSO [Toc] [Back]
lvcreate(1M), lvextend(1M), lvsplit(1M).
Hewlett-Packard Company - 2 - HP-UX 11i Version 2: August 2003 [ Back ] |
