• Check that the OK LED (back of enclosure) is off.
Stopping I/O
When troubleshooting disk drive and connectivity faults, stop I/O to the affected disk 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 disk 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 the IOM
About this task
Important: Consideration for removing the IOM:
• Do not remove a faulty module unless its replacement is on-hand. All CRU modules must be in place
when the system is in operation.
See CAUTION bullets regarding electrostatic discharge and anti-static protection in the “ESD
precautions” on page 55 section.
Illustrations in the IOM replacement procedures show rear panel views of the enclosure, and IOM is
properly aligned for insertion into the rear panel of the enclosure.
Procedure
1. Locate the enclosure whose ID LED (enclosure front panel – left side) is illuminated, and within the
enclosure, locate the IOM in slot 0.
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
the figure below.
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 the figure
below.
Chapter 7. Module removal and installation 67
Summary of Contents for 4957-J11
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