LVM Volume Group Dynamic LUN Expansion (DLE) and Contraction (DLC) (September 2009)

• Physical volume "/dev/rdisk/disk46" requires reconfiguration for contraction to requested

size 204800 MB.

In review mode, for a DLC operation, vgmodify reports that a physical volume can be

prepared for contraction to the specified size.

• The physical volume "/dev/rdisk/disk46" can be reconfigured for contraction to a minimum

size of 204793 MB by removing free extents from the end of the physical volume.

In review mode, or for failed change mode, for a DLC operation, vgmodify reports the

smallest size that the physical volume can be contracted to if free extents at the end of physical

volume are removed.

• The physical volume "/dev/rdisk/disk46" cannot be reconfigured for contraction to requested

size 409599 MB since the amount being contracted is less than the size of one extent.

In review mode, or for failed change mode, for a DLC operation, vgmodify reports that the

requested new PV size is less than one extent smaller than the previous PV size, so no

reconfiguration is performed.

• Error: The requested contraction size 10 MB for physical volume "/dev/rdisk/disk46" is too

small for reconfiguration to achieve.

In review mode, or for failed change mode, for a DLC operation, vgmodify reports that the

requested new PV size is too small to achieve. The vgmodify does not allow a physical

volume to be reduced down to zero extents (vgmodify retains at least one free extent). The

minimum physical volume size depends on the configured extent size and the configured

maximum VG size.

• Reconfiguration to contract physical volume "/dev/rdisk/disk46" to requested size 204800

MB succeeded.

In change mode, a DLC operation has succeeded in preparing a physical volume for

contraction.

• vgmodify: Error: Cannot reconfigure the volume group "/dev/vg1" to the requested maximum

volume group size 500 MB. The maximum volume group size can be decreased to a minimum

of 510928 MB.

In review mode, or for a failed change mode, vgmodify reports that the specified maximum

VG size decrease is too small to be achieved. The smallest that the maximum VG size can be

decreased to is the current size of the VG.

• The maximum volume group size for "/dev/vg1" has been decreased from 268435456 MB

to 67108864 MB.

In change mode, the volume group maximum VG size has been decreased to the requested

value.