ZFS Pool files are missing!!!

Hey guys!

Need your help please!

I am using Proxmox 2.2 with zpool called: DATA
after a recent reboot my VM's that are stored on DATA won't boot with error the files are missing, when i tried to locate them the whole pool is empty.
but when i run this:

root@proxmox:~# zfs list
NAME USED AVAIL REFER MOUNTPOINT
data 860G 52.5G 860G /data

it shows the right amounts, still no files!
after some research i understand it is some kinda mount issue, which i have no idea how to fix.

Please help!
Sincerely
Andrey

- - - Updated - - -

one more thing:
the zpool is intact:
root@proxmox:~# zpool status
pool: data
state: ONLINE
scan: scrub repaired 0 in 2h26m with 0 errors on Fri May 3 20:01:12 2013
config:

NAME STATE READ WRITE CKSUM
data ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
sdb ONLINE 0 0 0
sdc ONLINE 0 0 0
sdd ONLINE 0 0 0

errors: No known data errors
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