Dell PowerVault 50F (Fibre Channel Switch) - Manual (Page 91)

Error Messages: Dell™ PowerVault™ 50F 8-Port Fibre Channel Switch Installation and Troubleshooting Guide
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the same queue before the first message is processed by the receiving task, the queue overflows and the
message is discarded. This event causes the MQ-QWRITE error to be printed on the display, as well as on
the Telnet window, if open. The error is also stored in the error log which can be viewed with the errShow
command.
NOTE: The error log is cleared upon reboot.
There may be several reasons for this error. In some cases, the system may recover without human
intervention, however in most cases it will not. In some cases, the error can even indicate a task crash.
These problems can be diagnosed by technical support provided enough information is collected to allow a
detailed analysis of the specific case.
The MQ-QWRITE error message is shown in Figure A-2 (the front panel displays an abridged version of the
message).
Figure A-2. MQ-QWRITE Error Example
The most notable parameters are:
The ID of the task that attempted to send the message (tTimers in Figure A-2)
The queue ID (0x103d1d20 in Figure A-2)
The message pointer (0x103fd3d0 in Figure A-2)
The following commands should be executed, and their output, together with the complete message log
should be used when analyzing the error.
NOTE: Some of these commands can only be run from the root account.
Table A-3. Commands to Gather MQ-QWRITE Error Information
Command Description
i Lists all the current tasks in the system. Most tasks should be in "READY" or "PEND" state. If any task is in
"SUSPEND" state, then a task trace of that task should be run using the tt command.
tt <task
name> Shows the stack trace of the task.
show <queue
ID> Shows information about the queue that overflowed.
d <msg
pointer>,2,4 Shows the content of the message.
fspfShow Shows FSPF task's queue ID.
portSemShow Shows tasks waiting on port semaphores.
spy 5 Shows per-task CPU utilization. This command displays a report every five seconds. At least two reports should
be printed, since the first one will indicate that all the CPU is used by the shell.
spyStop Stops CPU utilization monitoring. This command can be typed in at any time during the monitoring process.