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Ultra 6 - X-RAID 2 (dual redundancy) volume not expanding
Hi, My ReadyNAS Ultra 6 X-RAID2 (with dual redundancy) configuration was: /dev/sda = 2TB /dev/sdb = 3TB /dev/sdc = 2TB /dev/sdd = 3TB /dev/sde = 4TB (3TB assigned) /dev/sdf = 3TB This c...
After unmounting volume c I've resized the physical volume /dev/md3 (since the RAID6 array has already been expended) and extendend the logical volume with 1.82T. After that I've resized the ext4 filesystem on /dev/c/c:
pvresize /dev/md3 lvextend -L +1.82T -n /dev/c/c /dev/md3 resize2fs -pf /dev/c/c
Now is everything as I expected it to be:
df -h Filesystem Size Used Avail Use% Mounted on /dev/md0 4.0G 1.4G 2.5G 37% / tmpfs 16K 0 16K 0% /USB /dev/c/c 11T 8.8T 2.1T 82% /c
Is far as I know from answers around the internet, RAID 6 bij default needs at least 4 drives (of the same size, that is) to operate (which is strange as technically for dual reduncandy 3 should be enough). I guess if you added a 4th 4TB drive, it would have expanded as expected.
It's good to know one can manually override this behaviour.
RAID-6 does require a minimum of four disks.
The volume capacity now is the same as it would have been with 6x3TB disks. If another 4TB disk is added then offline volume expansion may be possible to expand it a further couple of TB.
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