I had a very similar problem. 8 external USB drives running OpenSolaris native. When I moved the machine into a different room and powered it back up (there were a couple of reboots and a couple of broken usb cables and drive shut downs in between), I got the same error. Loosing that much data is definitely a shock.
I m running zraid2 and I would have assumed that a 2 level redundancy should fine to toss a lot of roughness at the pool. After panicking a little, stressing my family out, and some playing with zdb that lead nowhere, I did a zpool export mypool zpool import mypool It complained about being unable to mount because the mount point was not empty, so I did umount /mypool/mypool zfs mount mypool/mypool zfs status mypool and to my relieving surprise it seems all fine. ls /mypool/mypool does show data. Scrub is running right now to be on the safe side. Thought that may help some folks out there. Cheers! Andy
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