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system). Some operating systems limit the number of tape LUNs that can be discovered to
eight LUNs on each device port (remember there are multiple Fibre Channel ports on the
backup devices), but there are workarounds in some cases:
◦
Windows Large LUN support.
Enable when using more than 8 LUNs per port. Information is available at
support.microsoft.com/kb/310072/.
◦
HPUX Large LUN support (on v1 1.31 or higher).
For an HP-UX 1 1.31 server using persistent DSFs, the maximum number of LUNs per bus
on the server can be increased by entering # scsimgr set_attr
Disable unnecessary polling/diagnostic applications that can interfere with backups or impact
performance.
◦
Windows: Disable Windows Removable Storage Manager (RSM).
1.
Disconnect the Windows node from the SAN (unplug all Fibre Channel cables).
2.
Delete all files and subfolders under the ..\system32\NtmsData folder (location
of the system32 folder varies with different Windows versions).
3.
Enable and start the Removable Storage service in the Microsoft Computer
Management applet.
4.
Access the Removable Storage (My Computer/Manage/Storage/Removable
Storage) in the Microsoft Computer Management applet.
5.
Verify that there are no tape or library devices listed.
6.
Stop and disable the Removable Storage service in the Microsoft Computer
Management applet.
7.
Reconnect the Windows node to the SAN (plug all Fibre Channel cables back in).
8.
Reboot.
Windows using the HP LTO tape driver: Disable Windows Removable Storage Manager
◦
(RSM).
1.
Install the 1.0.4.0 or later driver.
2.
Complete one of these steps:
a.
The driver package contains a DisableAutoRun.reg file that can used to
modify the system registry. Log into the system as a user with Administrative
privileges and double-click the DisableAutoRun.reg file. The system will
prompt you to confirm. Enter Y or Yes to modify the appropriate registry entry
and disable polling.
b.
If the driver package does not include the DisableAutoRun.reg file, manually
edit the system registry using RegEdit. Log into the system as a user with
Administrative privileges, run RegEdit, and navigate to the following registry
key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\hplto
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.
IMPORTANT:
Adding or removing tape drives from the system may cause an older
driver inf file to be re-read, which in turn can re-enable RSM polling. If tape drives are
added or removed, check the registry for proper configuration and, if necessary, repeat
step 2.
◦
Windows: Disable Windows Test Unit Ready polling.
Information is available at
http://support.microsoft.com/kb/84241
http://
a max_lunid=32.
1.
Backup SAN Design Guidelines
39
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