Troubleshooting
96-30065-001 Rev. A0
DataDirect Networks EF4024 FC RAID System Setup Guide | 41
3.
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
❖
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)
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.
❖
No – Proceed to the next step
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.
❖
No – Proceed to the next step
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.
