IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

Physical Device Administration

 Device               Alternative States
             State
  EMP        RDY      SBY
  SBY        RDY      EMP HSP SHS
  DHS        EMP      HSP SHS
  SHS        HSP      DHS
  DDD        ONL      RBL
  RDY        EMP      HSP SHS SBY
  HSP        RDY      SHS DHS
  ONL        DDD
  RBL        DDD      ONL


To set or change the physical device state:

1.  Select the device from the Main screen of the Administration and Monitoring Program.
2.  Click on the radio button that indicates the desired state.

   NOTE: If you set a DDD drive to ONL without performing a Rebuild (RBL)  operation and that drive is part of a critical (CRT) logical drive, your system might lose data.

3.  Click on Set Device State.

Rebuilding a Device: 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.)

To perform a Rebuild operation:

1.  Click on the DDD device on the Main screen of the Administration and Monitoring Program.
2.  Click on 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.

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.

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