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Date:      Sat, 6 May 2006 20:54:34 +0100 (BST)
From:      Robert Watson <rwatson@FreeBSD.org>
To:        Chris <chrcoluk@gmail.com>
Cc:        Mike Jakubik <mikej@rogers.com>, stable@freebsd.org
Subject:   Re: quota deadlock on 6.1-RC1
Message-ID:  <20060506204720.S46997@fledge.watson.org>
In-Reply-To: <3aaaa3a0605061238ib77bb38x6f61eb6cc1c1c6c1@mail.gmail.com>
References:  <4457A02C.9040408@rogers.com> <35c231bf0605032011s65fbb1aby742438465ee98ee7@mail.gmail.com> <20060504033300.GA39935@xor.obsecurity.org> <44598615.3040400@rogers.com> <20060504044758.GA41047@xor.obsecurity.org> <44599732.1050905@rogers.com> <20060505080543.GD5466@garage.freebsd.pl> <35c231bf0605051049t2761281ar97b9634b8279b1fd@mail.gmail.com> <445B991F.3050600@rogers.com> <6.2.3.4.0.20060505145259.10d8dca0@64.7.153.2> <3aaaa3a0605061238ib77bb38x6f61eb6cc1c1c6c1@mail.gmail.com>

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On Sat, 6 May 2006, Chris wrote:

> are snapshots a default setting?

In case people want to avoid using snapshots, here are the uses I'm currently 
aware of in the base system:

- Background file system check uses snapshots.  This can be disabled by using
   background_fsck="NO" in /etc/rc.conf.

- dump uses snapshots if the -L paramater is specified, in order to take an
   atomic backup of the system.  It won't use snapshots unless explicitly
   specified.

- mksnap_ffs uses snapshots, as it's the operator snapshot creation tool.

FWIW, I and a moderate number of other people use snapshots daily on quite 
busy and over-burdened machines without problems.

Also, as an FYI, several quota-related snapshot fixes went into CVS in the 
last 24-48 hours.  Once they've settled for a few weeks, and assuming they 
don't have complex dependencies, they will get merged to RELENG_6. 
Presumably if there is sufficient demand, and they adequately address the 
reports of deadlocks with quotas+snapshots, they could be merged to RELENG_6_1 
as an errata update.

Robert N M Watson



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