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RAID information vanished after DISKPART delete disk

Posted on 2013-06-12
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Last Modified: 2013-07-11
Hello,

I have a RAID5 with 4 Disks in my Windows Home Server which serves as my primary Storage.
Due to a power outage (of my UPS(!) - go figure ;)) one of my disks is defective and my RAID degraded. I got a replacement Disk from WD, no problem.

The pull the old Disk out, put the new one in but it wouldn't let me repair the RAID.
So I opened the Command shell and started DISKPART.
I selected the defective DISK and wanted to remove it (Delete Disk=1).
Since this wasn't succesful either, I tried the Override switch.
Result: My whole RAID is vanished (no volume, all 4 Disks are 'empty').

Is there a way to easily recover all the RAID information on all the 4 drives?
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Question by:Smighty
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6 Comments
 
LVL 22

Expert Comment

by:Christopher McKay
ID: 39241751
http://www.runtime.org/raid-recovery-windows.htm

Please note, you will need an alternate location to copy the recovered data to.

Hope this helps!

:o)

Bartender_1
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Author Comment

by:Smighty
ID: 39242253
Thanks for the hint, but so far, the Runtime product is not able to determine a valid configuration I can mount.
I have a successful reconstruction with ReclaiMe Free RAID Recovery, but unfortunately I don't have a spare 6TB to write the whole reconstructed array to.

Rather than extracting the Data, my goal is to get the original RAID information back on the 4 disks to then copy out the Data over the network and building a new RAID (or installing Server 2012 and set up storage spaces ^^)

Is there a command line tool (like diskpart) that I could use for that?
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LVL 31

Expert Comment

by:Scott C
ID: 39242303
What about just rebuilding the RAID from scratch and then restoring from your backups?
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LVL 4

Author Comment

by:Smighty
ID: 39242383
unfortunately, there is no backup.... this is my home storage... otherwise I'd take that approach :)
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Accepted Solution

by:
Smighty earned 0 total points
ID: 39303767
for anyone interested, here is my solution:

Recover the RAID via the Free RAID Recovery Tool from ReclaiMe - thanks for releaseing this awesome thing for free.
I created a VHDX-File from it and saved it to another disk (neat thing about it: You only have reserve the Space that is actually used in the original RAID)
Further Note: While the Recovery itself does not use that much power, a 2GHz (AMD) CPU with 4GB RAM is not recommended to use for the process, I tried twice and both times ran into the problem of having 50k+ Handles open, all RAM exhausted and the SWAP-Files full. My other machine - a 3GHz (Intel) CPU with 8GB RAM didn't even break a sweat...

Mounting the VHDX did not succeed since windows had a problem recognizing the partitions on it. I had to use TestDisk (www.cgsecurity.org) to look into the then mounted - but in the Disk Management invalid - Disk. I didn't dare to mess with the Partition table in the file (mainly because I wanted to be done with the lengthy process and not do the 3day Recovery again).
But, TestDisk can do more:
You can copy single files or folders from the partition in a folder of choice (it even recreates the folder structure :)) - So I am currently 'extracting' all files and folders to another drive and have a 100% success rate recovering.

And all with Free Software :)
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LVL 4

Author Closing Comment

by:Smighty
ID: 39316906
I don't know if is allowed to award myself some points, but since I found it by myself and provided detailled information for others to reproduce my steps I do so anyway :)

If I may act against some rules (I don't know yet), please strip me off my points...
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