12-18-2012
You could do this.
1. Backup and delete the /backup filesystem
2. Add another smaller disk to the rootvg (make sure it is big enough to hold all the remaining LVs)
3. Move the LVs to the new disk with "migratepv -l ..."
4. Remove the 300GB disk from rootvg
5. Create a new VG (named something like backupvg) and create a /backup filesystem in it and mount it
6. Restore the /backup contents into the new /backup filesystem
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