Server crashed

[damienginty]

in need of some urgent advice - we have a poweredge R720 with a number of vdevs made up of mirrors (48 in total using powervault md 1000) - from what we can tell a drive failed and later the system crashed. the server has been rebooted but get disk vdev '/dev/.................eli' failed to open [error=2] while the server boots. freenas eventually loads but no configuration appears.

any help or advice would be very much welcome.