Verifying Component Failure; Stopping I/O; Removing An Iom - Seagate Exos E 4U106 Hardware Installation And Maintenance Manual

Verifying component failure

• Check Module Fault LED – rear (front of enclosure): Amber = Fault condition.
•
Check Fault LED (back of enclosure on IOM face plate): Amber = Fault condition.
• Check that the OK LED (back of enclosure) is off.

Stopping I/O

When troubleshooting DISC drive and connectivity faults, stop I/O to the affected DISC 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.
IMPORTANT: Stopping I/O to a DISC group is a host-side task, and falls outside the scope of this document.
When on-site, you can verify that there is no I/O activity by briefly monitoring the system LEDs; however, when
accessing the storage system remotely, this is not possible.

Removing an IOM

IMPORTANT: Considerations for removing IOMs:
• In a dual-controller environment, you may hot-swap a single controller module in an operational enclosure,
provided you first shut down the faulty controller.
•
In a dual-controller environment—if replacing both controller modules—you must adhere to the instructions
provided in
• Do not remove a faulty module unless its replacement is on-hand. All FRU modules must be in place when the
system is in operation.
See CAUTION bullets regarding electrostatic discharge and anti-static protection on
Illustrations in the IOM replacement procedures show rear panel views of the enclosure, and IOMs are properly
aligned for insertion into the rear panel of the enclosure.
1. Locate the enclosure whose ID LED (enclosure front panel – left side) is illuminated, and within the enclosure,
locate the IOM to be replaced.
2. Disconnect any cables connected to the IOM.
Label each cable to facilitate re-connection to the replacement IOM.
3. Unlock the IOM latch handle by turning the thumbscrew counter-clockwise as shown in detail No.1 in
Figure 73.
Take care not to remove the thumbscrew from the IOM latch handle.
4. Grasp the IOM latch handle between the thumb and index finger and pull. Revolve the handle out and
downward to lever the IOM out of the enclosure as shown in details No.2 and No.3 in
86 Module removal and replacement
"Before you begin" (page 85), and perform an orderly shutdown of the enclosure.
page 73.
Figure 73 (page 87).