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5
Troubleshooting
Fault isolation methodology
D1012/D1024 storage systems provide several ways to isolate faults. This section presents the basic
methodology used to locate faults within a storage system, and to identify the pertinent CRUs (Customer
Replaceable Units) affected.
Basic steps
The basic fault isolation steps are listed below:
• Gather fault information, including using system LEDs
(see
Gather fault information
• Determine where in the system the fault is occurring
(see
Determine where the fault is occurring
• Review event logs
(see
Isolate the fault
• If required, isolate the fault to a data path component or configuration
(see
Isolate the fault
View the enclosure LEDs
You can view the LEDs on the hardware (while referring to
identify component status.
Performing basic steps
You can use any of the available options described above in performing the basic steps comprising the
fault isolation methodology.
Gather fault information
When a fault occurs, it is important to gather as much information as possible. Doing so will help you
determine the correct action needed to remedy the fault.
Begin by reviewing the reported fault:
•
Is the fault related to an internal data path or an external data path?
• Is the fault related to a hardware component such as a disk drive module or power supply unit?
By isolating the fault to one of the components within the storage system, you will be able to determine the
necessary corrective action more quickly.
Determine where the fault is occurring
Once you have an understanding of the reported fault, review the enclosure LEDs. The enclosure LEDs are
designed to immediately alert users of any system faults, and might be what alerted the user to a fault in
the first place.
When a fault occurs, the Fault ID status LED on an enclosure's right ear illuminates (see the diagram
pertaining to your product's front panel components on
enclosure to narrow the fault to a CRU, connection, or both. The LEDs also help you identify the location of
a CRU reporting a fault.
Isolate the fault
Occasionally, it might become necessary to isolate a fault. This is particularly true with data paths, due to
the number of components comprising the data path. For example, if a host-side data error occurs, it could
be caused by any of the components in the data path, including cables, switches, or data host.
on page 29)
on page 29)
on page 29)
on page 29)
D1012/D1024 Hardware Installation and Maintenance Guide
LED descriptions
for your enclosure model) to
page
16). Check the LEDs on the back of the
29
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