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Sun Cluster 3.0 Hardware Guide

How to Replace a Failed StorEdge A3500 Controller or Restore an Offline StorEdge A3500 Controller

Use this procedure to remove a failed StorEdge A3500 disk array controller or restore an offline StorEdge A3500 disk array controller.

For conceptual information on SCSI reservations and failure fencing, see Sun Cluster 3.0 Concepts.

  1. On all nodes, to prevent LUNs from being automatically assigned to the new controller, set the System_LunReDistribution parameter in the /etc/raid/rmparams file to false.

    Caution - Caution -

    You must set the System_LunReDistribution parameter in the /etc/raid/rmparams file to false so that no LUNs are assigned to the controller being brought online. After you verify in Step 4 that the controller has the correct SCSI reservation state, you can balance LUNs between both controllers.

    For the procedure on modifying the rmparams file, see Sun StorEdge RAID Manager Installation and Support Guide.

  2. If you have a failed controller, replace the failed controller with a new controller, but do not bring the controller online. If you do not have a failed controller, proceed to Step 3.

    For the procedure on replacing StorEdge A3500 controllers, see Sun StorEdge RAID Manager Installation and Support Guide.

  3. On one node, use the RAID Manager 6.x graphical user interface's Recovery application to bring the controller online.

    Caution - Caution -

    You must use the RAID Manager 6.x graphical user interface's Recovery application to bring the controller online. Do not use the Redundant Disk Array Controller Utility (rdacutil) because it ignores the value of the System_LunReDistribution parameter in the /etc/raid/rmparams file.

    For information on the Recovery application, see Sun StorEdge RAID Manager User's Guide. For the procedure on replacing StorEdge A3500 controllers, see Sun StorEdge RAID Manager User's Guide. If you have problems bringing the controller online, see Sun StorEdge RAID Manager Installation and Support Guide.

  4. On one node connected to the disk array, verify that the controller has the correct SCSI reservation state.

    Run the scdidadm repair procedure (-R) on LUN 0 of the controller you want to restore.


    # scdidadm -R /dev/dsk/cNtXdY

  5. Set the new controller to active/active mode and assign LUNs to the new controller.

    For more information on controller modes, see Sun StorEdge RAID Manager Installation and Support Guide and Sun StorEdge RAID Manager User's Guide.

  6. Reset the System_LunReDistribution parameter in the /etc/raid/rmparams file to true.

    For the procedure on changing the rmparams file, see Sun StorEdge RAID Manager Installation and Support Guide.