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Smaky's avatar
Smaky
Guide
Jun 14, 2019
Solved

X-RAID Question & Expansion

I have recently upgraded my Ready NAS 6 Ultra Plus to OS 6.10.1. Started with 3 x 6TB WD RED NAS Drives and I am planning to expand by adding 3 x 4 TB additional drives I had around. However upon ini...
  • StephenB's avatar
    Jun 14, 2019

    Smaky wrote:

    I have recently upgraded my Ready NAS 6 Ultra Plus to OS 6.10.1. Started with 3 x 6TB WD RED NAS Drives and I am planning to expand by adding 3 x 4 TB additional drives I had around. However upon initial setup of an X-RAID (RAID-5) array with the 3 x 6 TB drives I went with horizontal expansion using the first  4 TB drive..


    One aspect here is that you can't always add a smaller drive to an existing array.  Ideally the added drive should be as large as the largest drive in the array.  In practice you can usually get away with adding a smaller drive if the size matches a drive that is already in the array (or was in the array in the past)

     

    So the system wouldn't add the 4 TB drive to your 3x6TB array (unless you'd vertically expanded a 4 TB drive in the past).

     


    Smaky wrote:

     

    I did a factory a factory default with the 4 drives but the end result is the same... RAID is resycing but to a total of 10.9 TB. I had the impession X-RAID would allow for mixed drives to be part of the array. 

    It does allow for mixed drive sizes (and I think it actually is working).

     

    With your mix of drives, the system is creating two RAID groups - a "base" group of 4x4TB RAID-5, and a second group of 3x2TB RAID-5. These are joined into one volume.

     

    The NAS creates these two groups in order.   The 4x4TB group has a capacity of 12 TB (10.9 TiB).  When that one is finished syncing, the system will add the second group - which will increase the volume size to 16 TB (14.5 TiB). That second group will need it's own resync.

     

    So wait for the first resync to complete, and you should then see the expansion step.

     

    I think you will be able to add the additional two 4 TB drives later, though it would have been better to have done the factory reset with all six drives in place.

     

     

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