HP StorageWorks MSA2324fc HP StorageWorks 2000 G2 Modular Smart Array referenc - Page 62
Rescanning disk channels, Clearing disk metadata, Restarting or shutting down controllers, Restarting
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Rescanning disk channels A rescan forces a rediscovery of disks and enclosures in the storage system. If two Storage Controllers are online, rescan also reassigns the enclosure IDs of attached enclosures based on controller A's enclosure cabling order. A manual rescan may be needed after system power-up to display enclosures in the proper order. A manual rescan temporarily pauses all I/O processes, then resumes normal operation. It can take up to two minutes for the enclosure IDs to be corrected. A manual rescan is not needed after inserting or removing disks; the controllers automatically detect these changes. When disks are inserted they are detected after a short delay, which allows the disks to spin up. To rescan disk channels 1. Verify that both controllers are operating normally. 2. In the Configuration View panel, right-click the system and select Tools > Rescan Disk Channels. 3. Click Rescan. Clearing disk metadata Each disk has metadata that identifies whether the disk is a member of a vdisk, and identifies other members of that vdisk. If a disk's metadata says the disk is a member of a vdisk but other members' metadata say the disk isn't a member, the disk becomes a leftover. The system overview and enclosure overview pages show the disk's How Used value as LEFTOVR. A leftover disk's Fault/UID LED is illuminated amber. Before you can use the disk in a new vdisk or as a spare, you must clear the disk's metadata. To clear metadata from leftover disks 1. In the Configuration View panel, right-click the system and then select Tools > Clear Disk Metadata. 2. In the main panel, select disks to clear metadata from. 3. Click Clear Metadata. When processing is complete a success dialog appears. 4. Click OK. Restarting or shutting down controllers You can restart the processors in a controller module when SMU informs you that you have changed a configuration setting that requires restarting or when the controller is not working properly. Shut down the processors in a controller module before you remove it from an enclosure, or before you power off its enclosure for maintenance, repair, or a move. A restart can be performed on either the Storage Controller processor or the Management Controller processor. A shut down affects both processors. Restarting If you restart a Storage Controller, it attempts to shut down with a proper failover sequence, which includes stopping all I/O operations and flushing the write cache to disk, and then the controller restarts. The Management Controller is not restarted so it can provide status information to external interfaces. If you restart a Management Controller, communication with it is lost until it successfully restarts. If the restart fails, the partner MC remains active with full ownership of operations and configuration information. CAUTION: If you restart both controller modules, you and users lose access to the system and its data until the restart is complete. 62 Using system tools