Isolating a controller module expansion port connection fault
During normal operation, when a controller module expansion port is connected to an expansion enclosure, the expansion port status LED is green. If the expansion port LED is off, the link is down.
Use the following procedure to isolate the fault. This procedure requires scheduled downtime.
NOTE:Do not perform more than one step at a time. Changing more than one variable at a time can complicate the troubleshooting process.
Halt all I/O to the storage
system. See “Stopping I/O” in the Dell PowerVault ME4 Series Storage System Owner’s Manual.
Check the host activity LED.
If there is activity, stop all applications
that access the storage system.
Check the Cache Status
LED to verify that the controller cached data is flushed to the disk
drives.
Solid – Cache contains
data yet to be written to the disk.
Blinking – Cache data
is being written to CompactFlash in the controller module.
Flashing at 1/10 second
on and 9/10 second off – Cache is being refreshed by the supercapacitor.
Off – Cache is clean
(no unwritten data).
Remove
expansion cable and inspect for damage.
Reseat the expansion cable.
Is the expansion port status LED
on?
Yes – Monitor the status
to ensure that there is no intermittent error present. If the fault
occurs again, clean the connections to ensure that a dirty connector
is not interfering with the data path.
No – Proceed to the
next step.
Move the expansion cable to a port on the controller enclosure with a known good link status.
This step isolates the problem to the expansion cable or to the controller module expansion port.
Is the expansion port status LED on?
Yes – You now know that the expansion cable is good. Return the cable to the original port. If the expansion port status LED remains off, you have isolated the fault to the controller module expansion port. Replace the controller module.
No – Proceed to the
next step.
Move the expansion cable back to the original port on the controller enclosure.
Move the expansion cable on the expansion enclosure to a known good port on the expansion enclosure.
Is the host link status LED on?
Yes – You have isolated the problem to the expansion enclosure port. Replace the IOM in the expansion enclosure.
No – Proceed to the next step.
Replace the cable with a known good cable, ensuring the cable is attached to the original ports used by the previous cable.
Is the host link status LED on?
Yes – Replace the original cable. The fault has been isolated.
No – It is likely that the controller module must be replaced.
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