Rebuilding a Defunct Drive

Rebuilding a Defunct Drive

When a hard disk drive goes defunct (DDD), a Rebuild operation is required to reconstruct the data for the device in its respective disk 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' for more information.)

Before you rebuild a drive, review the following guidelines and general information.

Guidelines for the Rebuild Operation

•  The replacement hard disk drive must have a capacity equal to or greater than the failed drive.
•  If the hard disk drive being rebuilt is part of a RAID level-0 logical drive, the RAID level-0 drive is blocked.
  •  You must unblock any RAID level-0 logical drives at the end of the rebuild operation.
  •  If you use the Administration and Monitoring program to initiate the rebuild operation, you can  unblock the blocked RAID level-0 drive when the rebuild operation completes.
     (See 'Unblocking Logical Drives' for more information.)

•  Data in a logical drive with RAID level-0 is lost during the rebuild operation. If you backed up your data  before the drive failed, you can restore the data to the new drive.

General Information about the Rebuild Operation

A physical hard disk drive can enter the rebuild state if:

•  You physically replace a defunct drive that is part of the critical logical drive.

   When you physically replace a defunct drive in a critical logical drive, the ServeRAID adapter or  controller rebuilds the data on the new physical drive before it changes the logical drive state back to Okay.

•  The ServeRAID adapter or controller adds a hot-spare or a standby hot-spare drive to the array  and changes its state from Hot-Spare or Standby Hot-Spare to Rebuilding.

Automatically Rebuilding the Defunct Drive

The ServeRAID adapter or controller will rebuild a defunct drive automatically when all of the following conditions exist:

•  The physical drive that failed is part of a RAID level-1 or RAID level-5 logical drive.
•  A hot-spare or standby hot-spare drive with a capacity equal to or greater than the capacity of the defunct  drive is available the moment the drive fails.
  •  When multiple hot-spare drives are available, the ServeRAID adapter or controller searches for a  hot-spare drive of the appropriate size. The smallest drive that meets this requirement enters the Rebuild state.
  •  If no hot-spare or standby hot-spare drives are available, the rebuild operation will start the  moment you replace the defective drive.

  NOTE: If you physically replace the drive and the new drive does not appear in the Physical  Drives branch of the Main Tree, you must scan for new or removed Ready drives.

•  No rebuild, synchronization, or logical-drive migration operation is in process.

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