I have a WD EX4 configured with three Red 3 TB drives and 1 Red 2 TB drive. The power led is flashing red and the display reads Vol 1. Degraded see dashboard.
The NAS is configured with one RAID 5 volume and when I open the dashboard it goes to the RAID Profile screen which says that RAID Health is degraded. I did a manual rebuild and it still reports the volume as degraded and the Disk Status, all four drives report GOOD. I took a look at the S.M.A.R.T status, but I’m not certain what it is telling me. I need to do some more research, Essentially what I am trying to understand is which disk is going bad (I am assuming that some disk error is the root cause).
I’m a little surprised by this as this NAS and the drives are under a year old and they don’t get that much use. It is used to backup a couple of MACs and a couple of PCs. I also have one additional question. If i determine which disk is going bad, can I simply swap out the bad disk for a new disk? I assume that I can, but can I replace the bad disk with one with more storage capability? If the 2 TB drive is the one going bad, I probably would like to replace it with another 3 TB or 4 TB drive. Somewhere when I first encountered this issue, I ran across a post saying something to the effect that the drive had to be the same size.
Thanks for any help/advice,