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Storage Foundation supports reclamation of the unused storage on thin-reclamation capable arrays and LUNs. Storage Foundation can reclaim blocks in a Veritas File System (VxFS) file system that is mounted on a Veritas Volume Manager (VxVM) volume.
The thin reclamation feature is supported only for LUNs that have the thinrclm attribute. VxVM automatically discovers LUNs that support thin reclamation from thin capable storage arrays. You can list devices that are known to have the thin or thinrclm attributes on the host.
See Identifying thin and thin reclamation LUNs .
For a list of the storage arrays that support thin reclamation, see the Hardware Compatibility List (HCL):
http://www.symantec.com/docs/TECH211575
Thin reclamation is not supported for boot devices.
You can use the thin reclamation feature in the following ways:
Space is reclaimed automatically when a volume is deleted. Because it is asynchronous, you may not see the reclaimed space immediately.
Perform the reclamation operation on a disk group, LUN, or enclosure using the vxdisk command.
Perform the reclamation operation on a Veritas File System (VxFS) file system using the fsadm command.