HP StorageWorks 6000-series Virtual Library System User Guide (AH809-96049, September 2010)

A Troubleshooting
This appendix describes some common issues you may encounter while configuring or using the VLS
including automigration/replication and deduplication issues.
VLS Common Issues
SolutionPossible causesSymptom
Increase the maximum number of
LUNs per device the operating sys-
tem is configured to see. To change
the maximum LUN per device set-
ting:
• For Microsoft Windows—See
http://support.microsoft.com/
default.aspx?scid=kb%3ben-
us%3b310072.
• For HP-UX—The value can only
be changed for HP-UX versions
11.31 and later. Increase the
number of LUNs per bus on the
HP-UX server by entering #
scsimgr set_attr -a
max_lunid=32. You can view
the connected IO by entering #
ioscan -m lun.
You cannot create legacy DSFs
for LUN IDs above 7; use per-
sistent device special files in-
stead.
See the HP-UX documentation
for more information.
• For other operating sys-
tems—See the operating system
web site.
There are more LUNs on the FC
host ports than the operating system
is configured to see. Once the
maximum number of LUNs on a
device is detected, the operating
system stops looking for more
LUNs. In the case of the VLS, the
operating system considers each
FC host port to be one device. So,
if the maximum number of LUNs an
operating system is configured to
see is eight, the operating system
will only see LUN0, LUN1, ...,
LUN7 and will not see LUN8,
LUN9, ..., and up on each FC host
port. By default Windows and HP-
UX hosts can see a maximum of 8
LUNs per FC host port.
Some of the virtual devices are not
detected by the operating system
when it scans the SAN for new
hardware.
HP StorageWorks 6000–series Virtual Library System User Guide 309