HP Surestore Disk Array 12h System Administrator's Guide for HP-UX, MPE, and W - Page 30

HP-UX Using the HP-UX System Administration Manager Adding a Disk Downing (Excluding) a Disk Downing (or excluding) a disk is typically done in preparation for testing the disk. After the disk is downed, testing can be done without impacting disk array operation. If testing reveals that the disk is good, the disk can be included back in the array configuration. Downing a disk has the same effect as if the disk failed or was physically removed from the cabinet. If Auto Rebuild is enabled, the disk array will immediately begin a Rebuild when a disk is downed. The down operation can be either destructive or nondestructive. The type of down performed determines whether the disk array will assume there is any valid data on the disk if it is returned to the array configuration. If a destructive down is performed, the disk array will assume no data on the disk is valid. If the down is nondestructive, the disk array will assume any data on the disk that was not updated in the disk's absence is valid. To protect data availability, the disk array will normally not let you down a disk if doing so would result in loss of data redundancy or data unavailability. However, you can override this protection by specifying the appropriate Exclusion Restriction. You can choose to down the disk even if a loss of redundancy would result, but not data unavailability. Or you can down the disk even if data unavailability would occur. NOTE. Two disks on the disk array are used to store the information for recovering data maps if they are lost. The disk array will not let you down one of these RDM disks. To down a disk: 1. Select the desired disk array controller from the list on the screen. 2. Select "Actions" on the menu bar. 3. Select "Disk Array Maintenance." 4. Select "Exclude Disk..." 5. Select the disk to exclude. 6. Select the desired "Exclusion Restriction". 7. Select "Assume Valid Data Next Time" to make the exclude nondestructive. If this option is not selected, the exclude will be destructive. 8. Click "OK" to effect the change, or click "Apply" to select another disk to exclude. After testing, a downed disk can be returned to the disk array configuration by manually including it. For more information, see the preceding section, "Including a Disk". 30