HP StorageWorks 1500cs HP StorageWorks 1500 Modular Smart Array maintenance an - Page 78
Replacing the controller, controller cache, or controller battery, Before you begin
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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 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 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. 78 Customer replaceable components