HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes (April 2009)

Changed Features
The following features have changed in the March 2009 release of LVM and MirrorDisk/UX:
vgmodify Enhancements
The vgmodify command supports the following new features for Version 2.0 and higher
volume groups:
• Online reprovisioning
Enables you to modify the volume group configuration parameters without deactivating
the volume group. For example, to change the maximum size of active volume group vg02,
enter:
# vgmodify -a -S 32900g /dev/vg02
• Online dynamic LUN contraction
Enables you to prepare a physical volume for a LUN contraction using disk utilities without
deactivating the volume group. For example, to prepare active volume group vg02 for LUN
contraction to 400 megabytes on physical volume /dev/rdisk/disk32, enter:
# vgmodify -a -C 400m /dev/vg02 /dev/rdisk/disk32
• Online dynamic LUN expansion
Enables you to take advantage of the increased disk size of a physical volume without
deactivating the volume group.
For example, to reconfigure an activated volume group to take advantage of a physical
volume size increase, use the –E and –a options to vgmodify. For example, if volume group
vg02 on physical volume /dev/disk/disk32 has been expanded, use the following
command to add physical extents to it:
# vgmodify -a -E /dev/vg02 /dev/rdisk/disk32
The vgmodify command supports the following new features for Version 1 volume groups:
• Online Reprovisioning
Enables you to modify the volume group configuration parameters without deactivating
the volume group. For example, to change the maximum number of physical extents for
volume group vg02, enter:
# vgmodify -a -e 8000 /dev/vg01
• Online and Offline LUN Contraction
Enables you to prepare a physical volume for a LUN contraction using disk utilities while
the volume group is online or offline. For example, to prepare offline volume group vg01
on physical disk /dev/rdisk/disk38 for LUN contraction, enter:
# vgmodify -C 400m /dev/vg01 /dev/rdisk/disk38
To prepare online volume group vg01 on physical disk /dev/rdisk/disk38 for LUN
contraction, enter:
# vgmodify -a -C 400m /dev/vg01 /dev/rdisk/disk38
For more information, see vgmodify(1M).
vgscan and vgimport Performance Improvement
The performance of the vgscan and vgimport commands is improved for Version 2.0 and
higher volume groups.
Deprecated or Obsolete Features
No LVM or MirrorDisk/UX features are deprecated or obsolete in the March 2009 release of
HP-UX 11i v3.
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