Here's some info explaining the behavior:
http://www.symantec.com/connect/forums/how-media-server-load-balancing-affects-restores-openstorage

We use the USE_BACKUP_MEDIA_SERVER_FOR_RESTORE option in our environment as
we have multiple MSDPs at locations across the country.  I don't want a
media server in Vermont reading a backup image in California to restore to
a client in North Carolina.  I hope future versions of NetBackup handle
this situation better and don't assume that I always want the least busy
media server to do the restore because it may not be the best server for
the restore based on physical proximity.
--
Jack Forester, Jr.
Sr. Data Protection Administrator
Global Technology Services - AHS
Mylan, Inc.
5005 Greenbag Road
Morgantown, WV 26501

jack.forester AT mylan DOT com

Phone: +1.304.554.6039
Cell: +1.412.805.5313


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