Installation guide

Problems and solutions
191
Troubleshooting
Problems and solutions
This section contains known problems and solutions.
Problem 1
Error Message ID: 51 — In the event viewer when attempting to
install multiple host access (for clustering) to the same EMC VNX
series or CLARiiON storage group. The text of the message reads:
An Error was detected on device \Device\Harddisk <x> \DR <x>
during a paging operation
Solution Until host cluster software is installed, only a single host should
access a storage group at a time. Refer to the EMC Support Matrix for
supported host configurations.
Problem 2
EMC Knowledge base solution emc29097 — If using adapters
connected to both VNX series or CLARiiON SPs, without PowerPath
installed, duplicate LUNs will be visible in the Device Manager and
Disk Manager. Only one instance of the LUN will be accessible, and
all other matching mappings will be listed as Unknown, Unreadable,
and Unallocated.
Solution This is normal behavior when multiple paths are available,
PowerPath is not installed, and the initiator type is registered in
PowerPath mode (array default depending on core code revision).
Problem 3
EMC Knowledgebase solution emc69307 — When using QLogic
adapters in a Brocade fabric environment, after upgrading Brocade
3900-series switch firmware to 3.0.2m, the adapters report repeated
link errors, and intermittently lose fabric connectivity.
PowerPath may report paths lost and then found in quick succession,
and repeated Windows 2000 event log error entries for Link
Down/Link Up events similar to the following:
Event ID: 11
Source: ql2300
Description: The driver detected a controller error on \Device\Scsi\ql2300x.
Data (words): offset 34 = 80120000 [ErrorCode: Link down error]
Event ID: 11
Source: ql2300
Description: The driver detected a controller error on \Device\Scsi\ql2300x.