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The Graveyard - Products No Longer Supported => D-Link Storage => DNS-323 => Topic started by: btaveira on May 31, 2010, 07:56:20 PM

Title: RAID Degraded - removed HD but don't wanna lose my data
Post by: btaveira on May 31, 2010, 07:56:20 PM

Hi All

My RAID 1 was showing degraded, so I used the Manual Rebuild option which took about 2-3 days running and finished with FAILED.

I saw on another forum that someone removed the failed HD and when replaced back it was recovered, since it actually had no real problems. So I also removed the 'bad' HD and put it back.

Now current Status is: Volume_1 : RAID 1 (Degraded)
Seagate     ST31000333AS     9TE1SSX4     0 GB

* If I select Autorebuild nothing happens.

* If I click on "Select RAID type and Reformat" it shows me both HDs:

 Seagate     ST31000333AS     9TE1NXAE     1000 GB
 Seagate     ST31000333AS     9TE1SSX4     0 GB

But only first option is available:
Select a RAID type:     (X)  Standard (Individual Disks)
      () JBOD (Linear - Combines Both Disks)
      () RAID 0 (Striping - Best Performance)
      () RAID 1 (Mirroring - Keeps Data Safe)

But when I click next it gives me the message "You are about to reformat the hard drive(s).  All data will be erased.  Do you wish to continue?"

So I click CANCEL. Is there anyway I can recover without loosing my data? I'll check that one disk externally to make sure it's good/or not so I can replace it if that's the case.

Thanks !!

Title: Re: RAID Degraded - removed HD but don't wanna lose my data
Post by: jamieburchell on June 01, 2010, 02:29:14 AM

Sounds like a bad disk, hence the failed RAID and inability to re-build it.

Switch the NAS off, take out the good disk and connect it to a PC directly if you can. Then use a linux file system driver from http://www.fs-driver.org/ (http://www.fs-driver.org/) and mount the drive read-only. Then backup your data somewhere.

If you have a USB drive enclosure, or USB to SATA cable, it makes it even easier to do the above.

If you use Linux, you don't need any external software to read the disk.

You should keep backups of what's on your NAS.