Technical data

Replacing the c
ontroller, controller cache, or controller battery
The following s
ections detail procedures for replacing an MSA array controller, controller cache module,
or controller cache battery pack:
• Before you begin
•Verifyingcom
ponent failure
• Removing the controller
• Removing the controller cache module
•Removingthe
controller cache battery pack
• Installing the controller cache battery pack
• Installing the controller cache module
• Installing t
he controller
• Verifying the replacement
Perform only the steps required for your service event. For example, re-seating an array controller includes
Removing the controller and Installing the controller.
Before you begin
CAUTION:
• Before removing a component or blanking panel from an operational device, make sure that you
have the replacement part available. Removing a component or blank impacts the airflow and
cooling ability of the device. To avoid possible overheating, insert the new or replacement component
withinoneortwominutes. Iftheinternaltemperatureexceedsacceptablelimits,thedevicemay
overheat and automatically shut down or restart.
• Parts can be damaged by electrostatic discharge. Use proper anti-static protection.
CAUTION:
• When replacing a controller, HP recommends that the old cache module be moved to the new
controller. In single-controller configurations, if the controller fails, this ensures that disk writes that
might have been trapped in the old controller's cache are completed.
• In dual-controller configurations, if a controller fails during an expand process, the old cache module
must be migrated to the replacement controller to complete the expand process. If this is not done,
thearraycontentsareinvalid.
• In dual-controller configurations, hot-add or hot-replace a controller or Fibre Channel I/O module
only during periods of low I/O. Hot-adding or hot-replacing these modules while under heavy I/O
may cause a momentary pause, performance decrease, or loss of access to the MSA while the new
controller is starting up. After the startup process is complete, full functionality will be restored.
• In dual-controller configurations, the MSA controller and Fibre Channel I/O modules are
hot-pluggable and the MSA does not need to be powered down during the replacement. However,
you must first use an MSA management utility, such as the ACU or MSA-CLI to disable the controller
before removal.
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Customer replaceable components