Troubleshooting
E F 3 0 1 5 S e t u p G u i d e ( R e v A )
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5.6
Isolating a controller module expansion port connection fault
During normal operation, when a controller module’s expansion port is connected to a drive
enclosure, the expansion port status LED is green. If the connected port’s 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.
1.
Halt all I/O to the storage system.
2.
Check the host activity LED.
If there is activity, halt all applications that access the storage system.
3.
Check the Cache Status LED to verify that the controller’s cached data are flushed to
the disk drives.
- Blinking – Data are still being written to disk.
- Off – Cache is clean (no unwritten data).
4.
Reseat the expansion cable, and inspect it for damage.
Is the expansion port status LED on?
- Yes – Monitor the status to ensure 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.
5.
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’s 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’s expansion port. Replace the controller module.
- No – Proceed to the next step.
6.
Move the expansion cable back to the original port on the controller enclosure.
7.
Move the expansion cable on the drive enclosure to a known good expansion port on
the drive enclosure.
Is the expansion port status LED on?
- Yes – You have isolated the problem to the drive enclosure’s port. Replace the
expansion module.
8.
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.
