SolutionPossible causesSymptom
Refer to the Microsoft website at:
http://support.microsoft.com/
Windows Removable Storage
Manager service (RSM) polls tape
VLS performance is being reduced by
frequent tape drive polling.
default.aspx?scid=kb;en-us;842411 ordrives on a frequent basis—every
complete the following steps to disable
RSM polling:
three seconds in Microsoft Windows
2000, and every second in Windows
Server 2003. Windows’ built-in
1. Install the 1.0.4.0 or later driver.
backup software (NTBACKUP) relies
2. Disable device polling in the system
registry.
on the RSM polling to detect media
changes in the tape drive. In SAN
• Establish a CLI session.
configurations, this RSM polling can
have a significant negative impact on
• Log into the system as
Administrator.
tape drive performance. For SAN
configurations, HP strongly
recommends disabling RSM polling.
• Run RegEdit and navigate to
the following registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\hplto.
• To disable RSM polling, edit the
AutoRun value found in this key.
A value of 0 (zero) indicates that
polling is disabled; a value of 1
indicates that polling is enabled.
3. After completing steps 1 and 2,
reboot the affected system.
4. Repeat this procedure for every
server visible to tape drives.
IMPORTANT: Adding or removing
tape drives may cause an older driver
.inf file to be reread, which can
re-enable RSM polling. If tape drives
are added or removed, check the
registry for proper configuration. If
necessary, repeat step 2 and 3 above.
To disable polling in the HP SDLT driver
(v3.0.2.0 or later):
1. Open the Device Manager on the
server connected to the tape drive.
2. Double-click an SDLT tape drive.
3. Click the DLT tab.
4. Check Increase performance
by disabling support for
Microsoft Backup Utility.
5. Repeat this procedure for each
server visible to each SDLT tape
drive.
NoneThis is expected behavior and does
not indicate a problem.
At reboot, there are spurious critical
FC port failures reported as
notification alerts, usually on every
port. Later, Info notification alerts for
each FC host port are generated,
indicating the FC ports are operating
normally.
If a blank drive is installed in drive bay
0, the system will not boot. To remedy
A blank drive was installed in drive
bay 0.
After replacing drive 0 in a node, the
system will not boot.
this, switch the drive located in bay 0
with the drive located in bay 1.
Re-enable oversubscription, set the alert
threshold so that the storage pool is
When you disable oversubscription,
the system does not monitor the
When oversubscription is enabled and
you create enough cartridges in a
within the capacity threshold, then waitstorage pool's capacity, even to checkstorage pool to put your free storage
for the pool to return to good (green)that it is no longer at a critical level.
The status will not change.
capacity below the threshold, the pool
may reach critical status. If you then
VLS Common Issues 175
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