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Today, I did the dumbest thing I've ever done in my life. I have a PowerEdge server with a PERC 710 RAID controller. I had 4 drives in RAID 5 configuration (1 2.7 TB Virtual Disk) and I wanted to add 4 more drives and expand the RAID (actually I would have settled for a new virtual disk). Anyway, the original virtual disk hosted an ESXi server with some 6 hosts include AD, Exchange, Lync, etc. If you haven't guessed by now, I redid the RAID controller configuration and have now lost everything! I don't have a backup. I have since restored the RAID configuration to the original configuration. I haven't written anything to the disk since that point. Is there any remote chance of recovering the original VMFS volume?

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Ouch. I hope this isn't a job-ending disaster for you. I have no idea if anything you can do will help. Can you be more specific with what the changes you made? A professional data recovery service is definitely worth considering, e.g. krollontrack.com/data-recovery/data-recovery-services/… but I would expect it to be well into the thousands of dollars and weeks of time for a RAID array. –  TessellatingHeckler Apr 27 '13 at 4:08
I went into the Lifecycle Controller interface on the Dell server, selected Configure RAID and then selected all the 8 drives I had, hit ok, rebooted - poof it was all gone. Then went back to the first 4 drives. Still nothing. Booted ESXi from USB and it doesn't see a VMFS partition on the virtual disk. Its not a "job-ending" disaster since I own my company but its a one-week-of-lost-productivity disaster. I am glad i didn't pull this on my data storage server! Thanks for the link though, i will investigate. –  pvenky Apr 27 '13 at 4:18
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