Replacing The Controller, Controller Cache, Or Controller Battery - HP 201723-B21 - StorageWorks Modular SAN Array 1000 Hard Drive Maintenance And Service Manual

Replacing the controller, controller cache, or controller battery

The following sections detail procedures for replacing an MSA array controller, controller cache module,
or controller cache battery pack:
• Before you begin
• Verifying component failure
• Removing the controller
• Removing the controller cache module
• Removing the controller cache battery pack
• Installing the controller cache battery pack
• Installing the controller cache module
• Installing the controller
• Verifying the replacement
Perform only the steps required for your service event. For example, re-seating an array controller includes
Removing 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
within one or two minutes. If the internal temperature exceeds acceptable limits, the device may
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,
the array contents are invalid.
• 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.
76
Customer replaceable components
and Installing the controller.