HP Surestore Disk Array 12h System Administrator's Guide for HP-UX, MPE, and W - Page 142

MPE Using the ARM Command Line Utilities for MPE Performing Disk Array Maintenance Tasks Performing Disk Array Maintenance Tasks There are several tasks that you may have to perform in the on-going management of the disk array. These maintenance tasks are typically performed infrequently and may involve taking the disk array off line. Shutting Down the Disk Array CAUTION! When an array shutdown is performed, the disk array becomes unavailable to the host system. An array that is shutdown appears to the operating system as if its power has been turned off. As with any disk subsystem, it is essential that file system access to the disk array be correctly removed before shutting down or powering off the disk array. Before an array Shutdown is performed, all mounted file systems mapped to the disk array must be unmounted. The umount operation synchronizes data in the MPE internal buffers with the data stored on the disk array. The disk array must be Shutdown prior to performing any maintenance. The Shutdown process copies vital data mapping information from the controller NVRAM to the disks. This protects the data mapping information should the contents of the NVRAM be lost or corrupted due to battery failure. Shutdown then takes the disk array off line, making all data unavailable to the host. The disk array can still be managed and tested, but all data is inaccessible while the disk array is Shutdown. Shutdown is initiated automatically each time the disk array is turned off using the power switch, so it is usually not necessary to initiate a Shutdown using the ARM utility. To Shutdown the disk array, type: arraymgr -s shut Restarting the Disk Array Following Shutdown, the disk array can be brought back on line by performing a restart. This makes the data on the disk array available to the host once again. To restart the disk array, type: arraymgr -s start 142