HP StorageWorks SAN Virtualization Services Platform 3.0 release notes (5697-0404, April 2010)
Deletion of last DPM in a DPM group
Do not delete the last DPM in a DPM group (even though it is enabled for recovery purposes). To
recover from this situation, the following procedures should be followed:
• For non-synchronous mirror objects: Use Remove Host Permissions and then reassign the permissions
to hosts that are visible to the presented DPMs.
• For synchronous mirror objects:
1. Delete the host/UDH from the setup.
2. Verify that the host is visible through the presented DPMs.
3. Re-create the UDH.
4. Reassign the synchronous mirror group permission to the host through the presented DPMs.
Changing virtual disk or group DPM selection from two to one DPM is not allowed
VSM does not allow changing the virtual disk or virtual disk group DPM’s selection from two to one
DPM. Reducing the DPM selection to a single DPM must be done by removing permissions and
reassigning the permissions through a single DPM.
Windows fault when array unresponsive
There is a Windows limitation that when an array is overloaded, it may return the command
unprocessed with a SCSI BUSY or QUEUE FULL status. This causes an endless loop in the Windows
StorPort.sys driver because it tries to resend the command. This may lead to a Windows fault
condition.
VSM must be enabled for "Reboot on fatal error"
To allow a second VSM server to take over in case the primary VSM server encounters a fatal error,
VSM must be set to "Reboot on fatal error." This is the default setting during installation and must not
be changed. This setting is enabled from a check box on the VSM Monitor Machine tab.
VSM server connection to the SAN
After disconnecting or connecting a VSM server from or to the SAN, you should wait at least two
minutes before reconnecting or disconnecting it again.
New front-end LUNs require rescan
To discover new front-end LUNs, perform a rescan from Computer Management on the Windows
server. Use this general procedure when assigning a new SVSP LUN:
1. Present a new LUN (or group of new LUNs) to the Windows server using VSM.
2. Log in to the Windows server, right-click on the My Computer icon, and select Manage.
3. Click Device Manager. In the right pane, right-click Disk Drives, and select Scan for hardware
changes.
4. New LUNs will appear under Disk Drives.
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