I had a disk failure in a Dell PowerEdge R710 server recently and as the server itself is due to be decomissioned soon and we have a few spare HDDs available of the correct type, we decided to use one of them.
If the replacement HDD was blank or new then doing a simple swap out would start the array rebuilding, but because the disk I used had come from another server it already had some raid configuration data on it. So in this post I’ll look at how to clear the foreign configuration from a replacement HDD.
Reboot the server and during start up when prompted press Ctrl + R to enter the Raid Configuration Utility.
Once in the PERC Configuration Utility use Ctrl+ N to switch between the tabs, below you can see the Virtual Disk Management page and the missing disk.
The next tab, Physical Disk Management shows the new foreign disk in slot 0.
The last tab shows the Foreign configuration as well and the current active configuration.
Now we have orientated ourselves go back to the Virtual Disk Management page, highlight the controller at the top of the screen and press F2 to list the available operations.
Scroll down and select Foreign Config, another window will pop up with the option to import or clear the configuration. Select Clear.
The warning message below will pop up, select Yes.
Looking at the Physical Disk Management page, you can now see the replacement disk is Ready.
Press F2, and then select the option to Make Global HS.
You can see below that the State has changed to Rebuild.
Exit the Raid Configuration Utility, reboot your server and the array will rebuild in the background.
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