Compaq ProLiant 1000 ProLiant Server Troubleshooting Guide - Page 70

Hardware Problems Unsafe Hot-Plug Drive Replacement Precautions Be aware of the following guidelines cautioning unsafe hot-plug replacement: • Do not remove a drive if any other member of the array is offline (the online LED is off). No other drive in the array can be hot-plugged without data loss. The possible exception to this might be the utilization of RAID 0+1 as a fault-tolerant form. In this case, drives are mirrored in pairs. More than one drive can fail and be replaced as long as the drive or drives they are mirroring are online. Refer to your Smart Array Controller user guide for information on fault-tolerance options. • Do not remove a drive if any member of an array is missing (previously removed and not yet replaced). • Do not remove a drive if any member of an array is being rebuilt, unless the drive being rebuilt has been configured as an online spare. The online LED for the drive flashes, indicating that a replaced drive is being rebuilt from data stored on the other drives. If an online spare drive is installed, wait for rebuilding to complete before replacing the failed drive. When a drive fails, the online spare becomes active and begins rebuilding as a replacement drive. After the online spare has been completely rebuilt, replace the failed drive with a new drive. Do not replace the failed drive with the online spare. NOTE: An online spare does not activate and start rebuilding after a predictive failure alert because the degraded drive is still online. The online spare activates only after a drive in the array has failed. • Do not power down a server storage system while the server controlling it is powered up. CAUTION: Powering down a server storage system while the server controlling it is powered up causes the Smart Array controller to mark the drives as failed and results in permanent data loss. 2-28 HP Servers Troubleshooting Guide