HP StorageWorks 9000 - Virtual Library System User Manual page 294

Symptom
The restore performance is degrad-
ing.
294 Troubleshooting
Possible causes
The restore performance will contin-
ue to degrade as you restore older
and older versions of a backup.
Solution
After 50 versions of a backup set
have been deduplicated, the VLS
automatically restarts the deduplic-
ation process as though from
scratch. The restore performance
will then improve because the re-
store versions are more recent.