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[nick_s19]

Hi,

I have had my 343 running for 6 months. It was in a 3 1TB drive raid 5 configuration on a UPS with v1.02 FW. One day we couldn't find the volume anymore so I logged into the GUI and saw that it was re-syncing. After it completed and rebooted the volume was gone. All three drives were there and tested good.

Has anyone seen this happen? The re-syncing process is suppose to give you your data back not erase it 

More importantly, does anyone know of a way to tell the unit to recover the volume w/o formatting? Raid is suppose to protect the data so I'm about 6 mo behind on manual backups.

Please help.

thanks

[ECF]

Have you rebooted the device again to see if the volume returns? also try the \\192.168.xx.xx (DNS-343 IP address) or whatever it is in the Windows command line and see if it shows Volume_1.

[nick_s19]

Unfortunatly yes, I rebooted several times and tried both windows explorer and IE to try to get at the data. Any idea why this would happen and what to do next?

thanks

[ECF]

Did you try what I recommended? Trying to access the device in the command line? Do you see a Volume_1?

[dar905]

I also had the same problem of loosing the RAID 5 volume with 4 Seagate 1.5T drives running R1.02 FW.

From the front panel, I pressed the "Next" button and the display return with the message " No Volume Detect" I rebooted the DNS-343 many times but still have the same problem.

As Nick asked, can I recover the RAID volume by configuring it again but without reformatting the 4 harddrives ?

Is there a way to recover my data/volume ?

[sliderwkw]

For seagate harddrives... pelase update the firmware for all your seagate harddisks. this was a old problems.... seagate harddrives has a issue

[dar905]

My drives are at the right level of firmware: CC1H.

The NAS can see all 4 drives 1 2 3 4 but lost the RAID Volume_1   

[nick_s19]

Hi again,

Sorry for the delay in responding back. I have spent the last few weeks trying to use ZAR to recover the data from the drives. The program takes forever to work and at the end of the day, always crashed prior to completion.

ECF, I did try command line you suggested and got network path not found. My firmware is also up to date.

I have been looking for a better program to use to recover the data. Can anyone recommend one that works? I found another program called UFS Explorer. It requires some knowledge of how the RAID was created. Can anyone tell me the following configuration information?

Stripe Size
Raid 5 parity Distribution
Parity lenght (stripes)
Reserved sectors, beginning and end

thanks,

Nick

[sliderwkw]

try to use this program http://www.runtime.org/raid.htm

[nick_s19]

Thanks sliderwkw

The program looks interesting. I tried it with the defaults and it found nothing significant. The next steps are to answer the same questions I asked earlier. Then it has more to go on.

I tried another program called disk digger. It only works on single drives, not raids. It was able to find portions of files, the stuff on the disk you are looking at. I think there is enough information left to recover, I just haven't found the right tool yet.

If anyone knows the answer to the configuration questions, please chime in. Someone at D-link should know.

thanks,

[nick_s19]

Hi,

Can someone from D-link look up the answers to my earlier questions? I need to try everything in order to get my data back. Most raid recovery programs work better if they know what they are looking for. Please help.

Stripe Size
Raid 5 parity Distribution
Parity lenght (stripes)
Reserved sectors, beginning and end

thanks,

[dar905]

Finally able to recover all my data in the RAID 5 Volume 1 by putting all 4 hard drives in another PC and use the R-Studio program on a Windows XP machine to recover the data:

1. You need to specify the correct disk order, ie. first, second... forth disk. Do not select the whole disk, only       select the partition that has the same size as the disk.
2. Strip size  = 64K
3. No need to specify offset.
4. Only search for EXT2/EXT3 file system to save time.

I think my RAID failed because of over heating. Seagate specified the disks should not be operating above 55 degree C.

[iuliand]

Oau!
Great news! So it can be done!

This was one of my greatest concerns regarding this unit: What if some day I will need to recover the data... is it possible? It seems it is! Thank you for sharing. Now there is hope

Edit: I studied R-Studio features a little and it seems to be a really nice tool for recovering data from RAID. I'm impressed by the capabilities. You may have to do some research (or trial and error) but eventually you have very good chances to recover data from virtually any RAID5. Nice to know.
Again, thank you dar905 for this info.

[JAB]

Did you have to put the hd's in a computer with a raid controller or just standard?

[iuliand]

I didn't tested, but theoretically from r-studio tutorial is not necessary to have a raid controller. You just have to connect the hard drives in a computer in order to read the data. You may even just make images from the disks (if you have enough space available... ) and virtually join the images in r-studio to form a virtual raid and recover the data.