HP-UX 11i v3 vgmodify.1m (2011 09) Manpage

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Apply the LUN contraction setting that was just reviewed:

vgmodify -a -C 4000 /dev/vg02 /dev/rdsk/c2t2d0

Examples For a Volume Group Version 2.0 or Higher

The volume group version 2.0 /dev/vg03 is activated in the following examples.

Add extents to the physical volume

/dev/rdisk/disk10

that has been expanded by dynamic LUN

expansion:

vgmodify -a -E /dev/vg03 /dev/rdisk/disk10

Prepare physical volume

/dev/rdisk/disk10

for LUN contraction to size 4000 MB:

vgmodify -a -C 4000 /dev/vg03 /dev/rdisk/disk10

Use the review option to determine if the volume group size can be increased to 256 terabytes:

vgmodify -a -r -S 256t /dev/vg03

Apply the volume group size increase that was just reviewed:

vgmodify -a -S 256t /dev/vg03

Increase the maximum size of the volume group to 256 terabytes, and also check if any physical volumes

have been expanded by a dynamic LUN expansion:

vgmodify -a -E -S 256t /dev/vg03

Decrease the volume group size to 2 terabytes, to free up extents on the physical volumes:

vgmodify -a -S 2t /dev/vg03

WARNINGS

• Applicable to volume group version 1.0 only. Changing the type of a bootable physical volume will

prevent booting from this device and, therefore, may create an unbootable system.

• Do not restore a physical volume from a backup ﬁle (

lvmconf) produced prior to the latest

vgmo-

dify changes. Doing so will result in attempts to attach the device to the volume group failing and

may lead to activation failures. If there is any doubt about the conﬁguration in the

lvmconf ﬁle, use

vgcfgrestore -lv -f lvmconf_ﬁle_path to view the settings in the ﬁle.

• Applicable to volume group version 1.0 only. If the

vgmodify command is interrupted prior to com-

pleting its operation, then restoration to all physical volumes in the volume group may be required.

Use the restore script to accomplish this (see the Remarks section for more information).

FILES

/etc/lvmconf/VG.conf

Holds the latest (new) conﬁguration for the volume group.

/etc/lvmconf/VG.conf.old

If vgmodify completes successfully, this ﬁle contains the same new conﬁguration as

/etc/lvmconf/VG.conf.Ifvgmodify was interrupted, this ﬁle contains the previous (old)

conﬁguration.

/etc/lvmconf/VG_restore

A script created by vgmodify before making any update, to be used if the vgmodify command is

interrupted while committing the conﬁguration changes to the physical volumes. See the Remarks

section for its usage.

Notes

By default,

lvmconf ﬁles are stored in the /etc/lvmconf path. However this default path can be

altered by the LVMP_CONF_PATH_NON_BOOT variable in the /etc/lvmrc ﬁle for non-bootable volume

groups, with version 2.0 or greater. See vgcfgbackup (1M) for more details.