IBM 86624RY Maintenance Manual - Page 121

array. The ServeRAID adapters and controllers can reconstruct RAID level-1 and RAID level-5 logical drives, but they cannot reconstruct data stored in RAID level-0 logical drives. To prevent data integrity problems, the ServeRAID adapters and controllers set the RAID level-0 logical drives to Blocked during a Rebuild operation. After the Rebuild operation completes, you can unblock the RAID level-0 logical drives, and access them once again. But remember, the logical drive might contain damaged data. (Refer to "Unblocking logical drives" on page 108 for more information.) To perform a Rebuild operation: 1. Select the DDD device on the Main screen of the Administration and Monitoring Program. 2. Select Rebuild Device. 3. Select a RDY drive to use to reconstruct the data, or click on OK to use the same drive slot and SCSI ID if you have physically replaced the defunct drive. 4. The reconstruction begins automatically and reports progress information on the screen. Notes 1. The ServeRAID adapter or controller can perform only one Rebuild operation at a time. 2. If the array contains a critical (CRT) logical drive, the Rebuild operation changes the hard disk drive state from DDD to RBL. After the Rebuild operation completes, the hard disk drive state changes from RBL to ONL. (If you rebuild to a RDY drive, the DDD drive is removed from the disk array and becomes a defunct hot-spare (DHS).) 3. The hard disk drive being rebuilt must be the same size or larger than the failed drive. 4. If a hot-spare (HSP) drive is available, a Rebuild operation will start automatically. 5. If multiple hot-spare (HSP) drives are available, the ServeRAID adapter or controller searches all the drives on each channel for a hot-spare drive of the appropriate size. The first appropriate hot-spare drive found enters the Rebuild (RBL) state. Adapter administration: This section provides instructions for copying the drive configuration to the ServeRAID adapter or controller, copying the ServeRAID adapter or controller configuration to the drives, initializing the adapter or controller configuration, and scanning for new drives. Copying the drive configuration to the adapter: Netfinity 5500 M20 - Type 8662 113