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Begining of xfs partition destroyed

To: xfs@xxxxxxxxxxx
Subject: Begining of xfs partition destroyed
From: smuszlak <sacha.muszlak@xxxxxxxxxxxx>
Date: Tue, 04 Jun 2013 11:46:58 +0200
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Hi all,
Sorry for this long email, but I do hope you've got a solution to recover my lab's data (mostly unanalysed research data, a big part being mostly videos).

Hardware is 3ware 9096SA-4I RAID controler with 16 disks of 931.5M totalizing 13.6 To on an lvm xfs formated volume in RAID 5. It is in VERIFYING state in the 3ware bios.

I don't now original state of the server as I wasn't it's administrator and there isn't much written procedures left. (no idea if lvm patritions got expanded and so on)

I guess it was the /data partition of the FreeNAS volume on
lvm with VG called rosalbarray, and one LV

As I saw it with df -h there was a small partion prior to the VG, I guess it was a /boot partition on the raid but outside of the lvm.

But I did a mistake. Here it is :
I added a small IDE disk to receve a new FreeNAS OS.
At the formating step to install the os, booting form iso on CD from usb-CD reader I was on the other server waiting for the install disk to load when the keyboard and mouse switch (with a remotte button) changed machine inextedly and I hit return on the format step but on the wrong device : FreeNAS installed itself at the begining ot the 13.5T of data thus destroying partition information and about 2Go of /data as well as the supposedly /boot partition...

Now I ve booted on an crunchbang live cd where I've installed lvm2 package.
And of course what I see are 4 partitions created for FreeNAS and "unallocated" free space of 13ish To

Since yesterday I am running

Regarding data, I beleave disk it is about 50% full with about 5 to 7 To filled up.
Regarding lvm stucture all I have is speculations that needs to be checked.
Regarding original FreeNAS version, I have found an FreeNAS 8.3 CD and it is the one I subsequently used. Is there a way to recover xfs partition size and data (minus the about 2Go) from the secondary superblocks and then restore it to a mountable state ?

when xfs_repair is over (it takes ages) I will post it's result

for now the output is
Phase 1 - find and verify superblock...
bad primary superblock - bad magic number !!!
attempting to find secondary superblock...
with some
found candidate secondary superblock
Sacha Muszlak

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