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Date:      Fri, 30 Aug 2013 10:17:11 +0200
From:      Maurizio Vairani <maurizio.vairani@cloverinformatica.it>
To:        Andriy Gapon <avg@FreeBSD.org>
Cc:        freebsd-fs@FreeBSD.org, freebsd-stable@FreeBSD.org
Subject:   Re: Boot problem if a ZFS log device is missing
Message-ID:  <52205507.4030802@cloverinformatica.it>
In-Reply-To: <521F0DEB.20408@FreeBSD.org>
References:  <521F05F0.4090607@cloverinformatica.it> <521F0DEB.20408@FreeBSD.org>

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On 29/08/2013 11.01, Andriy Gapon wrote:
> on 29/08/2013 11:27 Maurizio Vairani said the following:
>> I am able to boot the PC without a cache device but not without a log device. Why ?
> The log could potentially contain uncommitted entries.  Without the log device
> there is no knowing if it did or did not.  And if it did then the pool is
> inconsistent state without the log device and so it can not be imported.
>
> The cache is not persistent and so there is nothing needed from it upon a boot.
>
Thank you for the clear and concise reply.

Yesterday I have done some test. If I remove the stick from the USB 
port, before the shutdown the PC, it  don't crash but continues to 
works. Then  I am able to reboot the laptop without inserting the stick 
with a pool that works in degraded mode.

 From the end user point of view a PC should always boot, even with a 
missing ZFS log device.

Regards
Maurizio




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