# Controller configuration

The storage configuration for an enclosure is stored in the controller compact flash memory. This configuration takes precedence over the configuration that is stored on disk. Therefore whenever a controller is replaced, make sure that the new controller does not have an existing configuration. Follow the procedure below to clear the configuration of the new controller.

Note: If the controller does not have a configuration and the configuration stored on disk does have a valid configuration (like in the case of a FRU replacement) then the arrays are marked as foreign. In this instance you do not need to perform this procedure and you may select to import the arrays into ServeRAID Manager.

If the controller has a configuration that does not match the disk configuration then the arrays are flagged as alien. Thus it is very important to perform the clear procedure to prevent alien arrays.

# Procedure to clear the configuration from a controller

1. Unlatch all the drives from the enclosure (drives should be disconnected)

2. System Reboot or power cycle the enclosure.

3. Establish a Telnet session for Controller A and login as Administrator

4. At the CLI prompt enter !backdoor. This will take you to a Bash prompt

5. Type hrdc . See example below:

DSX00[A]# !backdoor

DSX00[A]:/ # hrdc

Note: It is not necessary to run hrdc on both controllers.

It may take several minutes to clear the configuration depending on the number of arrays\logical drives present.

6. At the Bash prompt enter exit to return to the CLI prompt.

7. System Reboot the enclosure.

8. Start ServeRaid Manager.

9. Once you are connected to the enclosure push all of the drives back in.

10. Right click on each controller and select “Scan for new or removed\ready drives”. Once all of the drives are discovered you will see the arrays listed as foreign devices.

11. At this time you may import the arrays into ServeRaid Manager by right clicking on each array icon and select import array.

Note: If drives from another enclosure have been installed and these drives contain a configuration, the arrays may be reported as “alien”. If you want to use these drives and create new arrays, their configuration will need to be destroyed. However, if you want to keep the configuration that is on these drives, you need to clear the controller configuration (see procedure above) and then import the arrays into ServeRAID Manager.

This completes the Clear procedure.

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