HP MSA 1040 SAN Storage - Manual (Page 54)

54 Troubleshooting
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 as described in "Stopping I/O" (page 47) .
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 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 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.
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 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.
Isolating Remote Snap replication faults
Cabling for replication
Remote Snap replication is a licensed feature for disaster-recovery. This feature performs asynchronous
(batch) replication of block-level data from a volume on a local storage system to a volume that can be on
the same system or a second, independent system. The second system can be located at the same site as
the first system, or at a different site. See "Connecting two storage systems to replicate volumes" (page 32)
for host connection information concerning Remote Snap.