Expert Mode: Restoring a failed DRU or PPU


You woke up this morning, and while checking your files, you figure that the content of one of your drives is gone, the drive has failed. No worries – FlexRAID allows you to restore its content in a new drive!


This tutorial will guide you through the process allowing to recover this data.
Note that you can simulate a failing DRU by simply moving away the content of one of your DRUs.


Restoring a failed DRU or PPU

To execute a Restore, open your Snapshot RAID configuration by clicking on its icon on FlexRAID desktop, go to the Command Execution Center, scroll down to the end, and click on the arrow next to Restore: . Restore section opens:


First you need to select the DRU or PPU you want to restore – in our case, DRU2 failed.


Optionnally, you can select the path to which you want to restore the failed data. Leaving empty will restore it to the path corresponding to the DRU or PPU you want to restore.
In case of drive failed, best practise is to replace it with another drive, mounted with same letter or path.


Then hit the Restore button – the restore process will start.


It will restore the content of the failed DRU or PPU, and then run a validate on the restored data to check that everthing was restored correctly. Upon completion, you will see the success message:


That’s it – you lost a drive but not its content!


In some cases, for example if your RAID was not fully synchronized, you can have a partial restore with some corrupted files.


Note: Restoring a PPU

This guide shows how to restore a failed DRU. The same process can be used to restore a failed PPU, but that only makes sense in multi-PPU configuration (if you lose your PPU in single PPU configuration, you can just recreate the array).

In case of multi-PPU configuration, and if one of your PPUs fail:
– if PPU2 (or PPUn with n greater) has failed: you can use the same process
– if PPU1 has failed: since FlexRAID looks for its metadata in PPU1, this is a special case. In order to restore PPU1, you will have to set a different metadata path in the Run-Time Properties of your RAID:


You can enter in this field the complete path to the flxr.meta file in your PPU2 for example.



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2 Responses to “Expert Mode: Restoring a failed DRU or PPU”

  1. shell October 31, 2011 at 2:32 AM #

    Restore doesn’t even work.
    The [] task has successfully initiated… Process number: 4

    • xliv October 31, 2011 at 4:40 AM #

      Hi Shell,
      The restore works for many people, it’s either a configuration problem, or potentially a bug.
      please use the forum to post issues and technical questions. Also refrain from using bad words… Thx!

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