ZFS: Failed pool causes system to hang

[Quartz]

> I don't know the ahci/cam stack from a hole in the wall, but it seems to
> me that if it can gracefully handle two drives dropping out and coming
> back randomly, it ought to be able to handle three. I suppose it's
> possible that zfs itself is not the root cause of the problem, but one
> way or another there's some kind of interaction here, as I only
> experience an issue when the pool is no longer solvent.

Although, if there's some way I can definitively test to see if it's an 
ahci/cam issue or not, I'll be glad to try it.

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