> Several times, I destroyed the pool and recreated it completely from
> backup. zfs send and zfs receive both work fine. But strangely - when I
> launch a VM, the IO grinds to a halt, and I'm forced to powercycle
> (usually) the host.
A shot in the dark here, but perhaps one of the disks involved is taking a
long time to return from reads, but is returning eventually, so ZFS doesn't
notice the problem? Watching 'iostat -x' for busy time while a VM is hung
might tell you something.
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