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Date: Fri, 09 Nov 2007 23:28:27 +0100
From: Henri Hennebert <hlh@restart.be>
Organization: RestartSoft
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To: Richard Arends <richard@unixguru.nl>
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Cc: freebsd-current@freebsd.org, freebsd-stable@freebsd.org
Subject: Re: ZFS deadlock ?
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Richard Arends wrote:
> On Fri, Nov 09, 2007 at 09:35:59PM +0100, Henri Hennebert wrote:
> 
>>> This won't start the scrubs at the same time, but after each other. And
>>> the second will only start if the first one not fails (exitcode == 0)
>>>
>> Not at all, the scrub is asynchronious, I'm sure of it
> 
> Running 2 commands seperated by && will not run at the same time. Scrub
> could be asynchronious, i don't know, but that has nothing to do with the
> way you are running it.
> 
> See: echo "sleep 1" && time sleep 2 && echo "sleep 2" && time sleep 2
> and: ls -l /notfound && echo yes

Per the man page, zpool scrub *begin* a scrub witch go on in background, 
so two scrubs are running simustaneously on 2 different pools.

Henri