ZFS: Failed pool causes system to hang

[Quartz]

> So, you're not really waiting a long time....

I still don't think you're 100% clear on what's happening in my case. 
I'm trying to explain that my problem is *prior* to the motherboard 
resetting, NOT after. If I hard-reset the machine with the front panel 
switch, it boots just fine every time.

When my pool *FAILS* (ie; is unrecoverable because I lost too many 
drives) it hangs effectively all io on the entire machine. I can't cd or 
ls directories, I can't run any zfs commands, and I can't issue a reboot 
or halt. This is a hang. The machine is completely useless in this 
state. There is no disk or cpu activity churning. There's no pool 
(anymore) to be trying to resilver or whatever anyway.

I'm not going to wait 3+ hours for "shutdown -r now" to bring the 
machine down. Especially not when I already know that zfs won't let it.

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