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Identifying Cable Faults
When identifying cable faults you must remember that there are two sides of the
controller: the input/output to the host and the input/output to the drive enclosures.
It is also important to remember that identifying a cable fault can be difficult due to
the multiple components that make up the data paths that cannot be overlooked as a
cause of the fault.
Before you take to many troubleshooting steps, ensure you have reviewed the
proper cabling steps in the getting started guide. Many faults can be eliminated by
properly cabling the storage system.
Identifying Cable Faults on the Host Side
To identify a faulty cable on the host side, use the host link status LED and perform
the troubleshooting procedure described in "Using Controller Module Host Port
LEDs" on page 25.
Identifying Cable Faults on the Drive Enclosure
Side
To identify a cable fault on the drive enclosure side, perform the troubleshooting
procedure described in "Using Expansion Module LEDs" on page 33.
Disconnecting and Reconnecting SAS Cables
The storage system supports disconnecting and reconnecting SAS cables between
enclosures while the system is active. You might need to do this as part of replacing
an I/O module.
The guidelines are as follows:
If less than 15 seconds elapses between disconnecting and reconnecting a cable
■
to the same port, no further action is required.
If less than 15 seconds elapses between when disconnecting a cable and
■
connecting it to a different port in the same enclosure or in a different enclosure,
you must perform a manual rescan. In RAIDar, select Manage > Utilities > Disk
Drive Utilities > Rescan.
Chapter 7 Troubleshooting and Replacing FRUs
95
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Table of Contents
Troubleshooting
