How to Replace a Failed Controller or Restore an Offline Controller

Use this procedure to replace a Sun StorEdge A3500/A3500FC controller, or to restore an offline controller.

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

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

   ---

   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 5 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. Restart the RAID Manager daemon:

   # /etc/init.d/amdemon stop # /etc/init.d/amdemon start

3. Do you have a failed controller?

   • If your controller module is offline, but does not have a failed controller, go to Step 4.

   • If you have a failed controller, replace the failed controller with a new controller, but do not bring the controller online.

     For the procedure on replacing Sun StorEdge A3500/A3500FC controllers, see the Sun StorEdge A3500/A3500FC Controller Module Guide and the Sun StorEdge RAID Manager Installation and Support Guide for additional considerations.

4. On one node, use the RAID Manager GUI's Recovery application to restore the controller online.

   ---

   Note -

   You must use the RAID Manager GUI'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 the Sun StorEdge RAID Manager User's Guide. If you have problems bringing the controller online, see the Sun StorEdge RAID Manager Installation and Support Guide.

5. On one node connected to the Sun StorEdge A3500/A3500FC system, verify that the controller has the correct SCSI reservation state.

   Run the scdidadm(1M) repair option (-R) on LUN 0 of the controller you want to bring online:

   # scdidadm -R /dev/dsk/cNtXdY

6. Set the controller to active/active mode and assign LUNs to it.

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

7. 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.

8. Restart the RAID Manager daemon:

   # /etc/init.d/amdemon stop # /etc/init.d/amdemon start