Btrfs issue - how to access old data?

I made a btrfs volume with mkfs.btrfs.
The volume was created from 6 offline devices and two online devices. The online devices are the ones that I need the data from (Why can you mkfs.btrfs on an already mounted volume????)
The computer has been reset.
If I mount the volume I don't see the data.
If I fdisk /dev/sdi it shows empty partition table.
Is there anyway to recover the data?
Thanks,

I did something like this: mkfs.btrfs /dev/sdb /dev/sdc /dev/sdd ... /dev/sdk . Where /dev/sdc (ext3) & /dev/sdd (ntfs) were mounted (online). Next reboot - No data.
fdisk shows no partitions.
I'd like to recover the data.
Mounting the (btrfs) volume shows no data.
I seriously don't understand how you are allowed to mkfs if a volume is mounted...
edit: What's also frustrating is that it said "resource busy"... So I don't understand where the partition went...
Last edited by scarletxfi (2012-07-03 14:20:42)

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