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Forum Discussion
dave__
Sep 10, 2019Aspirant
How do I add a 4th disk on my RN214 that I originally set up with only three?
How do I add a 4th disk on my RN214 that I originally set up with only three? I removed all the files (except one hidden file that the box insists is "open" and can't be deleted,) and then did a f...
dave__
Sep 10, 2019Aspirant
I originally put the additional 3T disk in and it synced up and I patiently waited a week and it didn't change from the 8.17T from the original two 3T & one 4T disks I started with.
So, it took three days of work to remove the 8T of data so I could wipe out the disks with a Factory Reset because it sure looked like the implementation of whatever the disk format was did not allow for addition like I thought it should.
Now the sync guess is up to 18 hours and 40 minutes. And it still says the disk is 8.17T. But in another place it says it is 8.98T, so whatever.
StephenB
Sep 10, 2019Guru - Experienced User
dave__ wrote:
I originally put the additional 3T disk in and it synced up and I patiently waited a week and it didn't change from the 8.17T from the original two 3T & one 4T disks I started with.
2x3TB+4TB would have given you a 6 TB XRAID-volume (5.45 TiB). 3x3TB+4TB would give you 9 TB (~8.18 TiB).
So it looks like the volume actually did expand the first time (and that you are seeing the correct capacity now).
Again: the capacity rule is "sum the disks and subtract the largest". The extra space is used for the parity blocks that protect from routine disk failures and also allow the volume to be expanded. The reported volume size doesn't include this "extra" space.
Note you would have gotten an additional TB of space if you'd gone with a 4 TB drive. Right now you are wasting 1 TB of the 4 TB drive.
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