An Overview of Drive Replacement
For the IBM ServeRAID Adapter, you replace drives via the RAID configuration utility. To begin, select the Rebuild Drive option under Rebuild/Device Management option on the RAID Configuration Main Menu. The Rebuild Drive command requires that all drives in the array (except the drive being rebuilt) are online. When you select Rebuild Drive, the RAID adapter sends a start unit command to the drive being rebuilt. Once the drive starts successfully, the drive state changes from defunct (DDD) to rebuild (RBL). The logical drive remains in a critical (CRT) state until the rebuild is completed. Once the rebuild completes successfully, the logical drive changes to the okay (OKY) state.
If the logical drives are in an offline (OFL) state, meaning that multiple drives in an array are defunct, then you must use the Set Device State to ONL on all drives except the 'inconsistent' drive before rebuilding. If you mistakenly use this command on the 'inconsistent' drive, the rebuild process corrupts data.
NOTE: Please review the following section, 'Software Replace vs. Physical Replace', as well as the recovery procedures sections later in this document to understand which drive in a scenario is the 'inconsistent' drive. Knowing how to determine the 'inconsistent' drive is extremely important. This knowledge ensures you can troubleshoot correctly without corrupting data.
After you select the Rebuild Drive option, the next prompt asks you to indicate whether you want to rebuild the drive in the same location or a new location. Select Same Location if you physically replaced the old hard disk drive with a new one in the same bay. Select New Location to assign a hard disk drive in a new location. After the drive location has been selected, the adapter sends a start unit command to the drive and begins the rebuilding process on the critical logical drives in the array. The rebuild completes quickly under the following circumstances:
IF YOU USE THE WRONG ORDER WHEN YOU ATTEMPT A SOFTWARE REPLACE, DATA CORRUPTION RESULTS.
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