Quoting "Roman Mamedov" [off-list ref]:

On Wed, 20 Mar 2013 10:09:42 +0200
"Andris Berzins" [off-list ref] wrote:

quoted

I am running RAID5 array on 6x 3TB WD SATA disks.
I have problems with all of these disks (including replaced one).
Disks are being randomly kicked out from array and SMART shows
pending sectors which usually can be fixed by read-write or write to that se
ctor.

Perhaps you have a problem with something other than the drives, e.g.:

- a bad or insufficient PSU, providing too low (or too high) voltage over 5V
or 12V (this could manifest only under load, too);

I have bought 550W PSU specially for this. The server is connected through APC UPS.

- not enough cooling?

Putting a hand temperature seems lightly warm.

- inadequate case, resulting in overly high vibration or even resonance?

Well, the case is average workstation case.

quoted

Has anyone experienced something similar with WD green series?

If you see a sectors repeatedly appearing that become unreadable but are fix
ed
after a write, it is usually a symptom of a drive that is partially defectiv
e
and should be exchanged.

That one which I exchanged worked for 3 month without problems.

But since you have this symptom with all of them, maybe the cause is differe
nt.

quoted

Is this because of WD "green" series?

No.

"Green" series are special because they spin down after 7 seconds and they do not
return in timely manner when read error occurs.

--
With respect,
Roman