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Expanding Disk Space on raid 10
firmware 6.5.0 readynas 2120 I’m use 4---2TB drives with raid 10, total storage 4TB. I want to add more storage. I’ll either switch to raid 5 or get larger drives and stay with raid 10. I only h...
RAID6 on 4 HDDs with ARM CPU is going to be slower than RAID5. Imo, the difference of performance between RAID5 and RAID10 is not going to make any significant difference in your case. Unless you'll never use the capacity it would give you with the HDDs you have, I would pick RAID5.
You also can't setup a RAID5 on 2 HDDs.
Using Flex-RAID or X-RAID, if you use 2 HDDs, you can setup a RAID1 (X-RAID chooses for you).
Also, horizontal expansion in Flex-RAID doesn't happen at all like in X-RAID. Here, from 2 HDDs to 4 HDDs.
If you want to expand to RAID5, you must turn X-RAID back on. Which is perfectly fine btw, as you would do this only at the moment where you have only one volume left (it wouldn't work otherwise)
If you expand your volume in Flex-RAID, it will create a second RAID1 and concatenate the two arrays in the BTRFS volume. Data will be balanced between both RAID arrays, but it's not a true RAID10 (chunks are "single" not "RAID0").
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