100 Maintaining a Storage ArrayThe test results contain a generic, overall status message and a set of specifictest results. Each test result contains the following information:• Test (read/write/data loopback)• Port (read/write)• Level (internal/external)• Status (pass/fail)Events are written to the MEL when diagnostics are started and when testingis completed. These events help you to evaluate whether diagnostics testingwas successful or failed and the reason for the failure.Recovery OperationsRecovery operations involve replacing failed RAID controller modules andphysical disks, restoring data, and restoring the storage array to operation.Setting RAID Controller Module Operational ModeA RAID controller module has three operational modes:• Online• Offline• ServiceNOTICE: Placing a RAID controller module offline can cause loss of data.Placing a RAID controller module online sets it to the Optimal state andmakes it active and available for I/O operations. Placing a RAID controllermodule offline makes it unavailable for I/O operations and moves its diskgroups to the other RAID controller module if failover protection is enabled.Taking a RAID controller module offline can seriously impact data integrityand storage array operation.If you take a RAID controller module offline, the second RAID controllermodule in the pair takes over. Disk groups and their associated virtual disksthat were assigned to the offline RAID controller module are automaticallyreassigned to the remaining RAID controller module.NOTICE: Place a RAID controller module in Service mode only under the directionof Technical Support.
