ANSWER:

It looks as though your pool, tank, is comprised of four disks in a striped configuration; e.g. RAID-0 with no redundancy.

Try bringing the disk back online (reseat it, if it’s hot-pluggable), check its connections. Run the zpool online command, as given in the error message. See what happens. Short of that, I don’t believe there’s a way to get a listing of the files.

by ewwhite from http://serverfault.com/questions/379672