If The Enclosure Does Not Initialize; Host I/O; Dealing With Hardware Faults - Seagate Exos E 4U106 Hardware Installation And Maintenance Manual

• Review logs from the host application/operating system.
• Review Ddump output from both controllers:
The Ddump CLI command is described in the GEM Command-line Interface document.

Ddumps can be captured via the following interfaces: serial, Telnet, WCLI/SES.

Invoke help Ddump for additional information about capturing Ddump output.

See also "Command-line interface" (page
• If required, isolate the fault to a data path component or configuration as described in
(page 70).
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 drive module, controller module, or power supply unit?
Determine where the fault is occurring
When a fault occurs, the Module Fault LED—located in the lower left corner of the enclosure front
panel—illuminates. See also
LEDs. Also check the LEDs on the back and top panels (must remove a cover) of the enclosure to narrow the fault
to a FRU, connection, or both.
• See "Overview of rear panel LEDs" (page 26)
• See "Overview of top panel LEDs" (page 30)
The LEDs help you identify the location of a FRU 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: controller module, cable, or data host.
By isolating the fault to one of the components within the storage system, you can determine the necessary
corrective action more quickly.

If the enclosure does not initialize

It may take up to two minutes for all enclosures to initialize. If an enclosure does not initialize:
• Power cycle the system
• Make sure the power cord is properly connected, and check the power source to which it is connected
• Check log for errors

Host I/O

When troubleshooting drive and connectivity faults, stop I/O to the affected drive groups from all hosts as a data
protection precaution. As an additional data protection precaution, it is helpful to conduct regularly scheduled
backups of your data. See also

Dealing with hardware faults

Ensure that you have obtained a replacement module of the same type before removing any faulty module as
described in "Module removal and replacement" (page
70 Troubleshooting and problem solving
34).
"Overview of front panel LEDs" (page
"Stopping I/O" (page 86).
25). Check the status of the other front panel
73).
"Isolate the fault"