Date: Sat, 15 Jun 2013 09:54:43 -0500 From: Chuck Burns <break19@gmail.com> To: freebsd-fs@freebsd.org Subject: Re: Changing the default for ZFS atime to off? Message-ID: <51BC8033.6020605@gmail.com> In-Reply-To: <2AC5E8F4-3AF1-4EA5-975D-741506AC70A5@my.gd> References: <16FEF774EE8E4100AD2CAEC65276A49D@multiplay.co.uk> <2AC5E8F4-3AF1-4EA5-975D-741506AC70A5@my.gd>
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On 6/9/2013 5:39 AM, Damien Fleuriot wrote: > On 8 Jun 2013, at 20:54, "Steven Hartland" <smh@freebsd.org> wrote: > >> One of the first changes we make here when installing machines >> here to changing atime=off on all ZFS pool roots. >> >> I know there are a few apps which can rely on atime updates >> such as qmail and possibly postfix, but those seem like special >> cases for which admins should enable atime instead of the other >> way round. >> >> This is going to of particular interest for flash based storage >> which should avoid unnessacary writes to reduce wear, but it will >> also help improve performance in general. >> >> So what do people think is it worth considering changing the >> default from atime=on to atime=off moving forward? >> >> If so what about UFS, same change? >> > > I strongly oppose the change for reasons already raised by many people regarding the mbox file. > > Besides, if atime should default to off on 2 filesystems and on on all others, that would definitely create confusion. > > Last, I believe it should be the admin's decision to turn atime off, just like it is his decision to turn compression on. > > Don't mistake me, we turn atime=off on every box, every filesystem, even on Mac's HFS. > Yet I believe defaulting it to off is a mistake. > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" +1 here. I, too, usually turn it off, and doing so isn't especially difficult. Changing DEFAULTS is only good when the defaults actually break stuff. -- Chuck Burns <break19@gmail.com>
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