HP Surestore Disk Array 12h System Administrator's Guide for HP-UX, MPE, and W - Page 51

Using the ARM Command Line Utilities for HP-UX Performing Disk Array Maintenance Tasks HP-UX After the array completes initialization, file system and LVM logical volumes mapped to the disk array must be mounted for HP-UX to access the disk array. Resetting the Disk Array The disk array can be reset if there is a problem with SCSI channel communication. A reset will interrupt access to the disk array temporarily, so it should be done only when attempting to solve a problem with the disk array. To reset the disk array, type: arraymgr -R 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 -v option identifies the down operation as either destructive or nondestructive. This 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 (-v not specified), the disk array will assume no data on the disk is valid. If the down is nondestructive (-v specified), the array will assume any data on the disk that was not updated in the disk's absence is valid. To down a disk, type: arraycfg -D slot -d [-v] [-R|-Z] To protect data availability, the disk array will 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 ARM options. The -R option allows the disk to be downed even if a loss of redundancy would result, but not data unavailability. The -Z option allows the disk to be downed even if data unavailability would occur. A complete description of the options is included in the arraycfg man page. NOTE. Two of the disks in the disk array are used to store recovery map information. The disk array will not allow you to down either of these drives unless you use the -R or -Z option. 51