Defaults in 10.0 ZFS through bsdinstall

Teske, Devin Devin.Teske at fisglobal.com
Thu Nov 14 21:04:11 UTC 2013


On Nov 14, 2013, at 12:59 PM, Steven Hartland wrote:

> ----- Original Message ----- From: "Mark Felder" <feld at FreeBSD.org>
> To: <freebsd-fs at 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.
> 

Sounds like a vote for enabling it where-needed by-default (e.g., /var as a whole
or more selectively, /var/mail)
-- 
Devin

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