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Solved
Drive Storage Capacity Doesn't Add Up
I have two 2TB drives in my RN212, but it shows total capacity as 2TB.
It should be 4TB.
Both drives show up on the setup page as functional.
What have I done wrong?
It is working as designed (though perhaps not the way you want).
XRAID (the default RAID mode) provides single redundancy, so your data remains available even when a single drive fails. This takes away from the total volume size. The general rule for capacity is "sum the drives and subtract the largest" - which works out to 2 TB in your case.
In your specific case, the NAS is using RAID-1, which mirrors the two drives - everything is written to both in parallel.
If you need the extra space, you can either upgrade both drives to 4 TB, or you can back up your data and start over. You'd do a factory default with only one drive in place, and then switch to flex-raid. After that you'd insert the second drive and create a second 2 TB volume on it.
2 Replies
It is working as designed (though perhaps not the way you want).
XRAID (the default RAID mode) provides single redundancy, so your data remains available even when a single drive fails. This takes away from the total volume size. The general rule for capacity is "sum the drives and subtract the largest" - which works out to 2 TB in your case.
In your specific case, the NAS is using RAID-1, which mirrors the two drives - everything is written to both in parallel.
If you need the extra space, you can either upgrade both drives to 4 TB, or you can back up your data and start over. You'd do a factory default with only one drive in place, and then switch to flex-raid. After that you'd insert the second drive and create a second 2 TB volume on it.
Thanks so much!
I have never used RAID, so now I know how it works.
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