Date: Thu, 14 Nov 2013 20:59:14 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Mark Felder" <feld@FreeBSD.org>, <freebsd-fs@freebsd.org> Subject: Re: Defaults in 10.0 ZFS through bsdinstall Message-ID: <0CBA81A49FFC447C9452C9A27BC2D017@multiplay.co.uk> References: <20131114173423.GA21761@blazingdot.com> <59A9B68B-4134-4217-83F3-B99759174EFE@fisglobal.com> <5285148E.6020903@allanjude.com> <3D3332FA-0ABF-4573-8E65-4E7FBB37100B@fisglobal.com> <1384462198.13183.47596065.6F8E7BCD@webmail.messagingengine.com>
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----- Original Message -----
From: "Mark Felder" <feld@FreeBSD.org>
To: <freebsd-fs@freebsd.org>
Sent: Thursday, November 14, 2013 8:49 PM
Subject: Re: Defaults in 10.0 ZFS through bsdinstall
> On Thu, Nov 14, 2013, at 12:35, Teske, Devin wrote:
>>
>> I have never heard a good argument for having atime on. The performance
>> penalty on ZFS is quite large, and it also makes your snapshots grow
>> constant. If you have a use for it, you can turn it on I guess. This
>> would be solved by having the dataset editor we're planning for 10.1
>>
>
> POLA and POSIX, even though it was a bad decision to invent atime :-)
> We've never turned atime off before and it would be a huge surprise to
> me, so I'd avocate that we let the admins who know what they're doing
> turn it off. I know many Linux distros install with noatime and/or
> nodiratime, but I'm 99% sure tools don't create filesystems with atime
> flagged to be off by default (tune2fs -O noatime).
>
> We don't even do installs on UFS with atime disabled by default in fstab
> so why should we so suddenly change course for ZFS?
While I can see the reason some would argue to keep it on by default
I personally think this is a good change.
Why punish everyone forever due to poor design decision made in the distant
past, just because a few select applications make use of said feature?
Is not a change which benefits the masses but comes with a slight
inconvenience of the select few, where they need to enable a feature
no one else needs a good idea?
Sure it needs to be clearly messaged so its not a surprise, but if thats
done I'm all for it.
Regards
Steve
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