what size are your current drives in the Synology?... I currently have a 2 bay Synology but need more drive space so I've been looking for 4+ bay units.
http://www.smallnetbuilder.com/nas/...-roll-into-trouble-when-expanding-nas-storageI would be very careful with RAID expansion. You really need to be techincal about what is happening with the expansion. I always felt better moving the data off and building the new RAID and then copying the data back. I think it is safer and faster.
Hot swap is a nice feature but I don't see it being neccessary for a home NAS. You usually have time at homr to power the device down and change the drive out. If you are under a time crunch or losing money then buy hot swap.
don't bet the bank on RAID. In small NASes, my view is that it shouldn't be used.
There's no substitute for external backup - like big USB3 drive(s).
I think you find this true with most software RAID. Server guys use a hardware RAID controller card. The controller card has a processor on it built to run RAID.Just saw the Thecus N4310 as well and it seems okay except for the underpowered single core processor that seems to be overwhelmed by Raid5. It does have cloud access which is nice.
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