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[tqn]

Hello all,

My DNS-321 (firmware version 1.01) has 2 WD 640 GB HDs running in RAID 1 (manual rebuild option), and is used mostly as a backup. It is often powered off. The problem is that the RAID 1 volume becomes degraded VERY often. I took out the disk and running extensive WD diagnostic tests on it detected no problem; and yet after many manual rebuilds, the volume keeps becoming degraded.

What is going on here? Is this expected for manual rebuild of RAID 1? Or my DNS-321 is the culprit? Help please. Thanks.

[srue]

I've been running a RAID 1 for many months now, also with manual rebuild, and I have not had this issue.  I've never had the volume become degraded.  I do not believe frequent degradation is typical, so it could be something particular to your setup or your unit.  Good luck sorting it out.

[tqn]

Thank you srue. My DNS-321 is running with minimal features enable. Only the FTP server is enable and the rest is disable (no quota, no user/group, no UPnP server, no iTunes server, etc.). I do turn on HDD Hibernation and select the "After 15 min" Turn Off Hard Drives option. For testing, I'm going to disable both FTP server and HDD hibernation. We'll see. Anyway, here we go again with another manual rebuild...

[tqn]

After disabling the HDD Hibernation option, the degraded volume problem is gone. Probably my WD 640 GB harddisks (WD6400AAKS) do not respond to the turn-off mode correctly. BTW, I notice the fan never stops running when the hibernation mode is disable.