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Converting a Dual Controller Array to a Single Controller Array

If one controller fails in a dual array controller configuration, you might want to run a single controller for an extended period of time so that the array does not display as degraded in the console.

  1. Make sure you know the serial number of the controller being removed. You can check the event log for the failed controller's serial number, or check the console and make a note of the primary controller's serial number.

  2. Change the remaining controller’s redundancy setting to disabled.

    You must use the firmware application to disable redundancy on the controller. Refer to the SANnet II RAID Firmware User’s Guide for your array for information about accessing the firmware application, and then from the Main Menu, choose view and edit Peripheral devices > Set Peripheral Device Entry > Redundant Controller – Primary >
    Disable redundant controller.

  3. Stop the Agent.

    For information about how to stop the agent, see the chapter for your OS in the SANscape Software Installation Guide.

  4. Change to /var/opt/DotHill/ssagent and edit the file sscontlr.txt.
    The very last line in the file contains the serial numbers of both controllers. Remove the failed controller’s serial number from this line.
  5. # RAID_CONTROLLER=Enable:3197861:3179746

  6. Start the agent as explained in the installation chapter for your operating system.

  7. Rescan the console if it was open during this procedure.

  8. In a single-controller configuration, to avoid the possibility of data corruption, disable Write Back Cache.

    See Changing Controller Parameters - Cache Tab for information on disabling Write Back Cache.

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