HP StorageWorks 12000 User Manual page 223

Symptom
VLS performance is being reduced
by frequent tape drive polling.
HP StorageWorks 12000 Gateway Virtual Library System User Guide
Possible causes
Windows Removable Storage
Manager service (RSM) polls tape
drives on a frequent basis—every
three seconds in Microsoft Win-
dows 2000, and every second in
Windows Server 2003. Windows'
built-in backup software (NT-
BACKUP) relies on the RSM polling
to detect media changes in the tape
drive. In SAN configurations, this
RSM polling can have a significant
negative impact on tape drive per-
formance. For SAN configurations,
HP strongly recommends disabling
RSM polling.
Solution
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