I purchased my first NAS a Synology 411J 1½ month ago (without disks).
I already had a WD Caviar Green 2TB (WD20EARX)drive, so talking with the dealer I bougth another 3 2TB disks (WD20EARX). Also I checked that the WD Caviar Green are recommended on the Synology Web page. And many dealers sell them with the 411J. I set the thing up in a Raid5 setup. Everything has worked fine, and I started the process of filling stuff pictures and audio to the NAS.
Then 2 days ago suddenly the NAS started to beep, and it turned out, that one of the disks failed. I looked on the net, and then I removed the faulty disk, and put it in again. And then I was able use the repair on the disk control screen. The consistency check is now 100%, and now everyting is fine again and all the diskes are running normal.
Now I have looked on the net regarding the issue of LLC count on WD Caviar Green.
My diskes react different to this.
Look the schedule below:
Disk 1, Type=WD20EARX, RRER=0, SUT=6091, POH=697, LCC=189
Disk 2, Type=WD20EARS, RRER=163, SUT=1216, POH=886, LCC=676
Disk 3, Type=WD20EARX, RRER=0, SUT=5525, POH=673, LCC=37570 (This disk failed!, but works now)
Disk 4, Type=WD20EARX, RRER=0, SUT=6416, POH=673, LCC=37580
Explanation: RRER = Raw_Read_Error_Rate
SUT = Spin_Up_Time
The idea with a nas and raid 5 was to have all data collected safe and like a backup in Raid 5. With Raid 5 I would be OK in the unlikely event that one of the WD disks should fail.
Im worried reading on the net, is WD20EARX no good for NAS and especially Raid 5?
Is there a safe workround from WD, maybe a jumper setting ?
Please give me comments om this.