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AGSowjet's avatar
AGSowjet
Apprentice
Oct 20, 2016
Solved

How to calculate maximum available volume capacity with X-RAID and various HDDs?

We bought our first RN104 a couple of years ago with two 3 (2,7) TB disks in RAID 1 mode. After a while we added two 4 (3,6) TB disks and continued using RAID 1, giving us a total capacity (data + sn...
  • StephenB's avatar
    Oct 20, 2016

    The capacity rule for single redundancy is sum the disks and subract the largest.

     

    2x4TB + 2x8TB gives you 16 TB capacity (14.55 TiB).  This is the maximum capacity possible if you want to protect against single disk failure.

     

    If you switched your other NAS to use XRAID, 2x3TB+2x4TB would give you 10 TB (9.09 TiB). That's  3 TB more capacity then dual-RAID 1.

     

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