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[jibbler]

Hi, I was browsing my DNS-323 2 nights ago creating new files, saving others etc and all was ok then last night when I click the mapped folder in Windows Explorer it says it can't access the drive and that it might be corrupt. I have 2x Seagate 1.5TB drives in RAID1 and running 1.08 firmware.

I restarted the DNS, still no luck. I shut it down for 5mins and started it up, still no luck. I shut it down, removed the right drive, started up, still no luck. I ran a scan disk on the drive and showed no errors. In the status area it shows there's one 1.5TB Seagate in the left bay. But it shows the space available is -1 MB. I have email notification enabled for any problems and I didn't receive anything (until I removed the right disk and then I got a degraded RAID1).

Any ideas what went wrong? And/or how to get it up and running again? Is it possible to default the unit and start again but not format the drives?

[gunrunnerjohn]

Well, you don't have to format to reset to defaults, which would be my next step.  You can also remove that drive and stick the other one in the proper location and see if it's just one of the copies that is corrupt.

[Wiggs]

I agree with gunrunner - first try a factory reset.  You might want to remove one of the drives and plug it into a PC and BACKUP your data.


Regards,

[jibbler]

Ok, removed both discs, moved right to left and left right bay empty, turned on and could access data.

So that means that only the (original) left disc was corrupt.

Questions now are...
1. Why? Corruption due to disc, DNS, or just plain bad luck?
2. Where to? If corruption was due to DNS I'd think a default was in order. If it wasn't, what would the correct process be to restore RAID1 - I'm thinking remove both, return corrupt disc only, format, remove, put in both discs and let it restore the RAID. Any other thoughts/ideas?

[gunrunnerjohn]

First take the disk that had the problem and run the disk manufacturer's diagnostic on it connected to a PC directly.  Run the long full surface analysis and a write pass.  See if it comes up with errors.

[jibbler]

It was indeed a HDD failure on one disk. Seagate SeaTools failed the long DST test. Took a month or so but have just received the repaired (not replaced) disk back from Seagate.

What's the process for rebuilding RAID?

Not sure if "repaired" means that the actual components that store the store the data were replaced or if some other components were. So am unsure on the state of the disk. I'll try plugging it in to a Linux box I have using a SATA USB adapter. If there is something on it should I format from there?

As the left disk failed, and I moved the right disk to the left slot, should I put it back to how it was then insert the repaired disk to let the RAID repair itself or does the slot not matter?

Advice?



UPDATE:
Using Seagate DiscWizard on my Windows machine (Ubuntu wouldn't mount via USB SATA) it said the drive was empty so I put it in my DNS-323.

Regarding above questions about which slot it should go in, the same occured in both slots.

1. Turn off DNS-323
2. Insert "repaired" disk
3. Turn on DNS-323
4. Load DNS webpage
5. Presented with the following page

Hard Drive Configuration:
Click 'Next' to begin formatting the replacement drive. Re-synch will take place after the restart.

Vendor      Model      Serial Number   Size
Seagate      ST31500341AS   XXXXXXXX   1500 GB

  Reconfigure to RAID-1

               Skip   Next

* the 'Reconfigure to RAID-1' check box is not able to be ticked. Why??

6. Clicking Next anyway took me to this page...

Hard Drive Configuration:
The section allows you to setup a RAID configuration on the selected hard drives. Please note that the data stored on the drives will be erased during the formatting process.

  Enable Audo-Rebuild
  Disable Auto-Rebuild

* The 'Disable Auto-Rebuild' radio button is selected by default.

7. At this point I turn the DNS off, removed the "repaired" disk and made sure I could still access the data on the other disk which I could.

8. The fact that the 'Reconfigure RAID-1' option is greyed out and the fact that it says all data will be erased makes it sound like it's starting from scratch. Or is this just poor grammar and is in fact meaning that it will erase any data on the new drive?? If so then why is the 'Reconfigure to RAID-1' check box greyed out?


Advice??

[gunrunnerjohn]

I'd test the crap out of that disk on a computer before depending on it again!  I don't trust "repaired" or "recertified" disk drives!

[jibbler]

Yes but......

I will be testing the *** out of it. But as for the process for getting it back in RAID-1?

[gunrunnerjohn]

It should allow you to rebuild it if the drive is detected properly.