HP StorageWorks SAN Virtualization Services Platform 3.0.1 Release Notes (5697 - 0405, May 2010)

DPM reboot when unpresenting/re-presenting back-end virtual disks
Under certain circumstances, if permissions to a back-end virtual disk are removed from the SVSP
system (DPM and VSM), and then permissions are restored, or a new back-end virtual disk is created
with the same LUN number, the DPM may unexpectedly reboot. HP recommends that such operations
be scheduled for off-hours or during a maintenance window.
Initial GUI port statistics values are zero for an extended time
It can take up to 30 seconds for the port statistics values in the DPM GUI to be retrieved. This may
give the indication that nothing is happening. Wait for the collection of the statistics.
Running show debug dump command does not work as expected
The default show debug dump command attempts to output several binary files to the console. This
results in unreadable output. The default output set is appropriate for saving to a file (for example,
create debug dump), but not for terminal output. Using show should use a different set of
parameters to the underlying script to generate only text output. HP is working to resolve this issue.
Order of magnitude of Tx/Rx Kbytes not correct with show ports stats command
After a long runtime, the Tx Kbytes and Rx Kbytes statistics are not output correctly for the show
ports stats command. HP is working to resolve this issue.
The ‘%’ option of the show log command moves to the end of the file
The in-editor help display states you should press the % option, then enter a percentage. Instead of
moving to a percentage of the file, the % option of the show log command will always jump to the
end of the file. Instead, you should enter a percentage value and then press %.
Additional DPM limitations
The following are additional limitations that should be observed for the DPMs:
• TPRLO does not properly propagate PRLO to shared initiators.
• Avoid deleting or removing the presentation from the last virtual disk for a host. Avoid deleting
an absent host that has virtual disks.
• If the back-end storage is overloaded (returning a high rate of busy and queue full responses or
becoming unresponsive), the front-end host could experience I/O errors being returned from the
DPM. This is particularly true when running a synchronous mirror workload and performing per-
turbations (DPM reboots, cable disconnects, and so on).
• The personality or OS type of a user-defined host (UDH) cannot be changed in the VSM while
virtual disks are exposed. All virtual disk permissions must be removed before changing the per-
sonality or OS type of a UDH. Not doing so could lead to unexpected results, a crash, or a reboot
of the DPMs.
• Persistent reservations and SCSI-2 reserve-release do not work correctly in some cases:
• Persistent reserve completes successfully on passive SCSI-2 on a reserved virtual disk.
• Persistent reserver completes successfully on the active DPM. The virtual disk is SCSI-2 reserverd.
• When upgrading a Windows DSM-B host to the Full-Feature (FF) DSM, permissions to all virtual
disks presented to that host must be removed prior to uninstalling DSM-B and reapplied after FF-
SAN Virtualization Services Platform 3.0.1 Release Notes 21