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managerharry
 Post subject: G-RAID 4TB Gen 4 Recovery
PostPosted: June 23rd, 2013, 12:31 
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Joined: March 24th, 2010, 21:08
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Location: California
Working on a G-RAID 4TB Gen 4 raid box. Drive refused to mount. SMART reporting on both drives shows one OK, the other with some bad sectors. Failing drive was imaged with minimal corruption. Now trying to reconstruct RAID in UFS Explorer 5.6 but cant seem to find the correct parameters. Have identified first disk by EFI part in hexedit but running rebuild as RAID 0 with stripe size set to 64KB, 512KB, or 256KB (mentioned elsewhere as a possible for G-RAID models) does not result in a valid rebuild. Thinking perhaps it's a problem with the start sector or some other parameter?

Thank you!
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DR-Kiev
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 23rd, 2013, 16:31 
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Joined: March 7th, 2009, 12:43
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Location: Angel Data Recovery
NOP . You just don't know how to cook them. Solution is very nearest. Keep patience and continue trying another stripe sizes. The correct one is very unusual, and you will find it in the very end :roll:

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mr_spokk
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 23rd, 2013, 17:12 
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Joined: May 21st, 2007, 16:10
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DR-Kiev wrote:
NOP . You just don't know how to cook them. Solution is very nearest.:roll:

:wink:

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pcimage
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 24th, 2013, 13:30 
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Joined: November 29th, 2006, 10:08
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Location: UK
DR-Kiev wrote:
NOP . You just don't know how to cook them. Solution is very nearest. Keep patience and continue trying another stripe sizes. The correct one is very unusual, and you will find it in the very end :roll:



Yep, it's very unusual on these! :-)

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lcoughey
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 24th, 2013, 14:25 
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Joined: February 9th, 2009, 16:13
Posts: 2574
Location: Ontario, Canada
managerharry wrote:
Working on a G-RAID 4TB Gen 4 raid box. Drive refused to mount. SMART reporting on both drives shows one OK, the other with some bad sectors. Failing drive was imaged with minimal corruption. Now trying to reconstruct RAID in UFS Explorer 5.6 but cant seem to find the correct parameters. Have identified first disk by EFI part in hexedit but running rebuild as RAID 0 with stripe size set to 64KB, 512KB, or 256KB (mentioned elsewhere as a possible for G-RAID models) does not result in a valid rebuild. Thinking perhaps it's a problem with the start sector or some other parameter?

Thank you!

Just to confirm, you only mirrored the one drive that was reported bad? If so, be aware that your assumption that there are no issues with the other drives may be incorrect and your attempts to recover using original drives may result in destroying any chances of recovery.

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managerharry
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 25th, 2013, 1:37 
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Joined: March 24th, 2010, 21:08
Posts: 111
Location: California
Hmmm... my cooking skills are still not sufficient for this recipe, perhaps you could help with some more specific details? HFS+ volume label is at sector 131137 on first drive. Tried running the rebuild with all the preset stripe sizes from 1KB to 1024KB with no success. Also I'm not sure about start sector settings for each drive when rebuilding, should they be the same?

@lcoughey -- Both drive have been imaged. Working off the disk images, not original drives.
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dmarques
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 25th, 2013, 3:13 
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Joined: November 6th, 2006, 6:58
Posts: 1752
Try to check for footer as well as header.
Also, are you sure it's a RAID0, not a RAID5 ?
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hddguy
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 25th, 2013, 3:39 
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Joined: November 9th, 2006, 15:15
Posts: 2984
managerharry wrote:
rebuild with all the preset stripe sizes from 1KB to 1024KB with no success.



pcimage wrote:

Yep, it's very unusual on these! :-)
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DR-Kiev
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 25th, 2013, 5:23 
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Joined: March 7th, 2009, 12:43
Posts: 1091
Location: Angel Data Recovery
managerharry wrote:
Tried running the rebuild with all the preset stripe sizes from 1KB to 1024KB with no success. Also I'm not sure about start sector settings for each drive when rebuilding, should they be the same?


Hmm.... was very close , 1 step beside.

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hddguy
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 25th, 2013, 6:12 
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Joined: November 9th, 2006, 15:15
Posts: 2984
Alternatively, if you cant figure it out, just put the cloned images to the unit in the relevant order and work through the enclosure. Assuming it mounts, read off your data, if not recover it with software as the unit will build it for you.

Also, is much faster to recover this RAID via the enclosure...
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managerharry
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 25th, 2013, 12:49 
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Joined: March 24th, 2010, 21:08
Posts: 111
Location: California
mmm, stripe 512b aka 1 sector, correct :?: still this soufflé does not rise. maybe I need to manually define partition start?

I will try putting the imaged drives back in the enclosure and see if it rebuilds but I'd still like to figure out the correct parameters.
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DR-Kiev
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 25th, 2013, 15:35 
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Joined: March 7th, 2009, 12:43
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Location: Angel Data Recovery
managerharry wrote:
mmm, stripe 512b aka 1 sector, correct :?:

Bingo!!
Bonus game:
managerharry wrote:
still this soufflé does not rise. maybe I need to manually define partition start?

Answer here:
Quote:
HFS+ volume label is at sector 131137 on first drive.

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managerharry
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 25th, 2013, 16:59 
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Joined: March 24th, 2010, 21:08
Posts: 111
Location: California
Even with the correct stripe and partition start UFS is unable to autodetect the partition as it usually does. Error size on the bad drive was only 1197kb but perhaps that was enough to damage the partition table... Maybe UFS's scan feature would do the trick. I think I will try & put the imaged drives in the enclosure and see if it rebuilds. Thanks for all the pointers! :D
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DR-Kiev
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 26th, 2013, 4:50 
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Joined: March 7th, 2009, 12:43
Posts: 1091
Location: Angel Data Recovery
managerharry wrote:
Even with the correct stripe and partition start UFS is unable to autodetect the partition as it usually does. Error size on the bad drive was only 1197kb but perhaps that was enough to damage the partition table... Maybe UFS's scan feature would do the trick. I think I will try & put the imaged drives in the enclosure and see if it rebuilds. Thanks for all the pointers! :D



You gave up too early. UFS doesn't know well oxRI raid serviceMeta standart. It keeps S/N of all drives which give you troubles when you connect non original drives(clones) to the G-raid box .

May be you did mistake with order as addiotion?

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managerharry
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 27th, 2013, 15:45 
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Joined: March 24th, 2010, 21:08
Posts: 111
Location: California
Indeed DR-Kiev you are correct -- G-RAID enclosure does not appear to like the cloned drives. Pretty sure I've got the drive order correct; first drive is the one with the GPT signature at start and HFS+ further on. I'm missing some ingredient...
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hddguy
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 28th, 2013, 10:19 
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Joined: November 9th, 2006, 15:15
Posts: 2984
Maybe partition is bad. Create region in r-studio starting at start of HFS+ partition for direct access to data
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DR-Kiev
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: June 30th, 2013, 0:54 
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Joined: March 7th, 2009, 12:43
Posts: 1091
Location: Angel Data Recovery
managerharry wrote:
Indeed DR-Kiev you are correct -- G-RAID enclosure does not appear to like the cloned drives. Pretty sure I've got the drive order correct; first drive is the one with the GPT signature at start and HFS+ further on. I'm missing some ingredient...


Yes you are. You forgot , stripe size is the 512bytes. And where do you think sector with EFI header have to start ?

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lcoughey
 Post subject: Re: G-RAID 4TB Gen 4 Recovery
PostPosted: July 1st, 2013, 9:49 
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Joined: February 9th, 2009, 16:13
Posts: 2574
Location: Ontario, Canada
Next step will be to understand how HFS+ works, then you will be able to figure out the drive order...or just try all possible options and compare the results.

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