OK, I'll try to answer your original question
revaaron wrote:I'm looking to upgrade my full RAID 5 3x3TB, RAID 5 3x2TB into one single 6x4TB RAID 6.
changing it to a 3x3TB + 1x4TB RAID 5 until the 4TB WD40EFRX come out, swap out with the reds.
but if the 639 will support the WD50EFRX... I would love 6x5TB...
There is possibility to configure 6x4TB as RAID5 (~20TB) or RAID6 (~16TB). It's quite possible that you will be able to do the same with 5TB disks.
You can migrate existing RAID up to 16TB capacity, so you can now replace disks and expand any RAID up to the 16TB capacity.
Currently you can not expand existing >16TB RAID, this might be possible in the future.
It is not possible to expand already existing RAID to >16TB capacity, due to limits on present RAIDs, which means it won't be possible in the future.
It's possible that in the future you will be able to expand RAID over 16TB, maybe even those that will be created <16TB.
fantomas wrote:Which drobo? Are you sure it does not support over 4TB? When searching for this, I haven't seen anything about such limit.
you know what... I never thought about it.. I have the Drobo 4-bay second gen. When I originally configured it, I could only format it in seconds that added up to 16TB. I originally have 2 8TB Shares and then when I re-did the whole thing, I was only able to make a maximum of 1 16TB share (after they upgraded to ext4 internally), but I never tried to make it 2 16TB with apportionment of actually TBs to the different virtual partitions. IDK if that would be possible and looking at the current drobo dashboard, I don't know how I would even try that.
OK, we will leave this to DROBO. in fact, DROBO can have its own RAID levels with its own limits and they do not care about the filesystem (which AFAIK causes the 16TB the limit on QNAP)
experience with administration of UN*X (mostly linux) and applications on internet servers since 1994...