Originally posted by: ostost
If there is a filesystem in this logical volume you can reduce the filesystem size using the chfs -a size=<newsize> /filesystem. In this case the logical volume will be shrunk along with the filesystem.
Or if you have enough space on hdiskx and hdisky you can just migrate the PPs (using migratepv) from hdiskz to one of these disks in order to free it up. Once you don't have any PPs on hdiskz you can remove it from vg using the reducevg command.
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