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HP StorageWorks Carrier-Grade 2324fc Modular Smart Array user guide 49
Isolating a host-side connection fault
During normal operation, when a controller module host port is connected to a data host, the port’s host
link status LED and host link activity LED are green. If there is I/O activity, the host activity LED blinks green.
If data hosts are having trouble accessing the storage system, and you cannot locate a specific fault or
cannot access the event logs, use the following procedure. This procedure requires scheduled downtime.
IMPORTANT: 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. Reseat the SFP and FC cable.
Is the host link 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.
4. Move the SFP and cable to a port with a known good link status.
This step isolates the problem to the external data path (SFP, host cable, and host-side devices) or to the
controller module port.
Is the host link status LED on?
• Yes – You now know that the SFP, host cable, and host-side devices are functioning properly. Return
the SFP and cable to the original port. If the link status LED remains off, you have isolated the fault
to the controller module’s port. Replace the controller module.
• No – Proceed to the next step.
5. Swap the SFP with the known good one.
Is the host link status LED on?
• Yes – You have isolated the fault to the SFP. Replace the SFP.
• No – Proceed to the next step.
6. Re-insert the original SFP and swap the cable with a known good one.
Is the host link status LED on?
• Yes – You have isolated the fault to the cable. Replace the cable.
• No – Proceed to the next step.
7. Replace the HBA with a known good HBA, or move the host side cable and SFP to a known good
HBA.
Is the host link status LED on?
• Yes – You have isolated the fault to the HBA. Replace the HBA.
• No – It is likely that the controller module needs to be replaced.
8. Move the cable and SFP back to its original port.
Is the host link status LED on?
• No – The controller module’s port has failed. Replace the controller module.
• Yes – Monitor the connection for a period of time. It may be an intermittent problem, which can
occur with SFPs, damaged cables, and HBAs.