HP-UX Reference (11i v3 07/02) - 1M System Administration Commands A-M (vol 3)

l
lvcreate(1M) lvcreate(1M)
NAME
lvcreate - create logical volume in LVM volume group
SYNOPSIS
/usr/sbin/lvcreate
[-A autobackup][-c mirror_consistency][
-C contiguous][-d schedule]
[
-D distributed][-i stripes [
-I stripe_size]] [-l le_number  -L lv_size][-m mirror_copies]
[
-M mirror_write_cache][
-n lv_name][
-p permission][-r relocate][-s strict] vg_name
Remarks
Mirrored disk operations require the installation of the optional HP MirrorDisk/UX software, which is not
included in the standard HP-UX operating system.
lvcreate cannot be performed if the volume group is activated in shared mode.
DESCRIPTION
The lvcreate command creates a new logical volume within the volume group specified by vg_name.Up
to 255 logical volumes can be created in one volume group.
If you specify the
-n lv_name option, a new logical volume is created with that name. Otherwise, a
system-generated name of the form
lvolN is created, where N is the decimal equivalent of the two least
significant bytes of the minor number of the new logical volume, in the range
1 to 255 (see lvm(7)). Two
device files are created in vg_name: a block device file named lv_name or
lvol
N, and a character (raw)
device file named
rlv_name or rlvolN.
If you omit the -l and -L options, the logical volume is created with zero length. This permits you to
choose its physical volume location when you allocate logical extents with the lvextend command (see
lvextend(1M)). If you specify -l or -L, the location is determined automatically.
The default settings provide the most commonly used characteristics. Use the options to tailor the logical
volume to the requirements of the system. Once a logical volume is created, some of its characteristics can
be changed with the lvchange, lvextend, and lvreduce commands (see lvchange(1M),
lvextend(1M), and lvreduce(1M)).
Options and Arguments
The -c, -d, -m, -M, and -s options are only meaningful if the optional HP MirrorDisk/UX software has
been installed on the system.
lvcreate recognizes the following options and arguments:
vg_name The path name of a volume group.
-A autobackup Set automatic backup for this invocation of this command. autobackup can
have one of the following values:
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 logi-
cal volume belongs.
n Do not back up configuration changes this time.
-c mirror_consistency Set mirror consistency recovery. This option is effective only when -M n is
specified. It is ignored for
-M y. mirror_consistency can have one of the
following values:
y Set mirror consistency recovery on. This is the default.
LVM achieves mirror consistency during volume group activation by
going through all logical extents and copying data from a nonstale
copy to the other mirror copies.
n Set mirror consistency recovery off. LVM does not perform mirror
consistency recovery on this logical volume when the volume group is
activated following a system crash. This setting should only be used
on logical volumes that do not require mirror consistency recovery or
where mirror consistency recovery is performed by another subsys-
tem; for example swap. See the WARNINGS section for more details.
HP-UX 11i Version 3: February 2007 − 1 − Hewlett-Packard Company 467