Dell EqualLogic PS-M4110 - Control Module Handling Requirements; Replacing a Control Module

Dell EqualLogic PS-M4110 Hardware Owner's Manual Chapter Identifying Control Module Failures
• LEDs on the front panel of the array. See Front Panel Features and Indicators on page 2
• Messages on the console, in the event log, the CMC Array Status page, or in the Group Manager GUI
Alarms panel.
• Group Manager GUI and CLI output. The Member Controllers window or the member select show con-
trollers command output shows the control module status not installed.
• CMC GUI Health Conditions of the array are reported on the CMC GUI. Events associated with the con-
dition of a control module can be viewed on the CMC Storage Blade Status page.
When viewed from the front of the opened array drawer, CM0 is on the left side of the drawer, and CM1 is on
the right side.
If a control module fails, contact your PS Series support provider for a replacement.
Understanding Failover Behavior
In a dual control module array, only one control module is active (serving network traffic) at one time.
Each control module includes a cache-to-flash module for storing recently-used data. For redundancy, the cache
on the secondary control module mirrors the data that is stored in the cache on the active control module.
If the active control module fails, the secondary control module automatically takes over and becomes active.
Control module failover is transparent to applications, but iSCSI initiators must reconnect to the group IP
address.
Failover behavior for the PS-M4110 in the M1000e enclosure is described in detail in the Network Requirements
section in Array Networking Considerations on page 6.
Maintaining Control Module Firmware
A Type13 control module uses a microSD card to run the array firmware. You should run the latest firmware
version to take advantage of new product features and enhancements.
Caution: In a dual control module array, both control modules must run the same firmware version or only one
control module will function. When you update the array firmware, both control modules are updated to the same
firmware version.
Group members should run the same firmware version; otherwise, only the functionality common to all versions
will be available in the group. See the PS Series Release Notes for information about mixed-firmware groups.
If you are adding a second control module, upgrading a control module, or replacing a failed microSD card,
contact your PS Series support provider for a replacement. Inform your provider of the current PS Series
firmware version on your system. If you are replacing a failed control module, remove the microSD card from
the failed control module and install it in the replacement control module. This will make sure that you keep the
correct firmware.
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