HP P4000 9.0 HP StorageWorks P4000 Windows Solution Pack User Manual - Page 21

Verifying Microsoft DSM operations, Trouble bringing disks online

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Figure 14 Multiple paths ensure continued I/O in event of path failure . When the problem with the I/O path is repaired, the P4000 DSM for MPIO reconnects an I/O path to the storage system, thus restoring optimized performance and fault tolerance. Verifying Microsoft DSM operations If you see two devices that are exactly the same listed in the Disk Manager or My Computer, you may not have MPIO installed or you may not have logged using MPIO. For more information, see "Using Microsoft DSM" on page 12 and "Connecting volumes with MPIO" on page 13. Trouble bringing disks online If you cannot access volumes or do not see the disks (in Disk Manager or My Computer), you may need to bring the disks online. You may also see that the device in the iSCSI Initiator is listed with a device number -1 or with no device name. Use the following Windows utilities to solve the problem: • The automount setting in the Windows 2008 and Windows 2008 R2 DiskPart Command-Line affects whether disks will mount after changes in MPIO status, such as uninstalling generic MPIO or the P4000 DSM for MPIO. To run DiskPart, open a Windows command line and run diskpart.exe. For detailed information about the DiskPart Command-Line, see http://technet.microsoft.com/enus/library/cc766465(WS.10).aspx. • Log off all iSCSI sessions and use the command automount scrub to clean up volume mount point directories and registry settings for volumes that are no longer in the system. This can clean up conflicting disk information that prevents disks from coming online. Information about automount is available by typing the command help automount from the diskpart command line. • Check the SAN policy setting. The SAN policy should be set to Online All for SAN/iQ volumes to remount after uninstalling the P4000 DSM for MPIO. Information about the SAN policy is available by typing the command help SAN from the diskpart command line. P4000 Windows Solution Pack user guide 21

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Figure 14 Multiple paths ensure continued I/O in event of path failure
.
When the problem with the I/O path is repaired, the P4000 DSM for MPIO reconnects an I/O path
to the storage system, thus restoring optimized performance and fault tolerance.
Verifying Microsoft DSM operations
If you see two devices that are exactly the same listed in the Disk Manager or My Computer, you may
not have MPIO installed or you may not have logged using MPIO. For more information, see
“
Using
Microsoft DSM
”
on page 12 and
“
Connecting volumes with MPIO
”
on page 13.
Trouble bringing disks online
If you cannot access volumes or do not see the disks (in Disk Manager or My Computer), you may
need to bring the disks online. You may also see that the device in the iSCSI Initiator is listed with a
device number
—
1 or with no device name. Use the following Windows utilities to solve the problem:
•
The
automount
setting in the Windows 2008 and Windows 2008 R2 DiskPart Command-Line
affects whether disks will mount after changes in MPIO status, such as uninstalling generic MPIO
or the P4000 DSM for MPIO.
To run DiskPart, open a Windows command line and run
diskpart.exe
.
For detailed information about the DiskPart Command-Line, see
h
t
tp://t
ec
hne
t
.mi
c
r
o
s
o
f
t
.co
m/e
n
-
u
s/libr
ar
y/cc7
6
6
4
6
5(
W
S
.10)
.a
s
p
x
.
•
Log off all iSCSI sessions and use the command
automount scrub
to clean up volume mount
point directories and registry settings for volumes that are no longer in the system. This can clean
up conflicting disk information that prevents disks from coming online. Information about automount
is available by typing the command
help automount
from the diskpart command line.
•
Check the SAN policy setting. The SAN policy should be set to Online All for SAN/iQ volumes
to remount after uninstalling the P4000 DSM for MPIO. Information about the SAN policy is
available by typing the command
help SAN
from the diskpart command line.
P4000 Windows Solution Pack user guide
21