R/Evolution 2000 Series, Troubleshooting Manual

Page: 29 / 130

Chapter 3 Troubleshooting Using System LEDs 29
Isolating a Host-Side Connection Fault on an iSCSI
Storage System
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. Reseat the iSCSI 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 cable to a port with a known good link status.
This step isolates the problem to the external data path (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 host cable and host-side devices are functioning
properly. Return the 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 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.