Replacing an IOM

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Procedures for the removal and installation of an I/O Module.

Overview

Important: The IOM must be installed in IOM slot No.0. As you face the enclosure rear panel, this is the IOM slot located on the right. An IOM blank must be installed in the adjacent slot (Slot 1) as shown in the rear panel module slot index diagram. This configuration is required to ensure sufficient air flow through the enclosure during operation.

The I/O module (IOM) denotes a controller module.

You may need to replace an expansion module when:
  • The Fault LED is illuminated.
  • Logs or events in the firmware indicate a problem with the module.
  • Troubleshooting indicates a problem with the module.

Before you begin

Removing an IOM or IOM blank module from an operational enclosure significantly changes air flow within the enclosure. Openings must be populated for the enclosure to cool properly. Leave modules in the enclosure until ready to install a replacement. If replacing both IOMs in a dual-canister enclosure, record configuration settings before installing the new controller modules. See Removing the IOM, and Installing the IOM for instructions about installing an additional controller module.

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 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.