Here you go...Use this link..Online ADMS docs info..Enjoy ADSML

http://www.tivoli.com/support/storage_mgr/pubs/v3pubs/v1_html/aix/guide/a72a
tfrm.htm

Quick quote....
When virtual volumes (volumes with the device type of SERVER) in a primary
storage pool are reclaimed, the client data stored on those volumes is sent
across the network between the source server and the target server. As a
result, the reclamation process can tie up your network resources. To
control when reclamation starts for these volumes, consider setting the
reclamation threshold to 100% for any primary storage pool that uses virtual
volumes. Lower the reclamation threshold at a time when your network is less
busy, so that the server can reclaim volumes.

For virtual volumes in a copy storage pool, the server reclaims a volume as
follows:


The source server determines which files on the volume are still valid.

The source server obtains these valid files from a primary storage pool, or
if necessary, from an onsite volume (not a virtual volume) in another copy
storage pool.

The source server writes the files to one or more new virtual volumes in the
copy storage pool and updates its database.

The server issues a message indicating that the volume was reclaimed.