IBM 86607SU Hardware Maintenance Manual - Page 46

Unblocking logical drives: Whenever the ServeRAID controller performs a rebuild operation on an array, the data stored in any RAID level 1 and RAID level 5 logical drives in the array is reconstructed. However, the data stored in RAID level 0 logical drives in that array cannot be reconstructed. The data in the RAID level 0 logical drives is blocked when the ServeRAID controller detects that the array is valid, but the data might be damaged. After the rebuild process completes, you can unblock the RAID level 0 logical drives; this redefines their state as OKY and allows access to them once again. But remember, the RAID level 0 logical drive might contain damaged data. You must re-create, install, or restore the data for the RAID level 0 logical drive from the most recent backup disk or tape. To unblock a blocked drive: 1. Select the logical drive that is blocked from the Main Menu of the Administration and Monitoring utility program. A screen similar to the following appears. Logical Drive Information Logical Drive Number Blocked Part of Array Part of Merge Group Date Created State Size RAID Level Write Policy Read Ahead Strip Unit Size Number of Chunks Stripe Order 1 No A 1 05/19/97 OKY 100MB 0 WT On 8 KB 3 1,1 1,2 1,4 Unblock Initialize Synchronize OK 2. Click on Unblock to unblock the drive. 3. You must initialize all new logical drives before storing data in them. See with "Initializing logical drives" on page 36. 4. Restore the data to the drive from the most recent backup disk or tape. Logical drive migration administration: The logical drive migration (LDM) feature dynamically changes the current logical drive structure. You can use this feature to change the RAID level, increase the free space in a disk array, or change the size of a logical drive. To use the LDM feature, you must have two logical drives available: one free (FRE) logical drive and one source 38 Netfinity Server HMM