Changing the default for ZFS atime to off?

[Teske, Devin]

On Jun 8, 2013, at 11:54 AM, Steven Hartland 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?
> 

+1 we turn it off on every ZFS filesystem (but we also don't use ZFS for root)


> If so what about UFS, same change?
> 

We leave atime enabled for UFS root partition, /usr partition, /tmp partition, and /var

But if/when we do use UFS for non-system partitions, we turn it off there too.
-- 
Devin

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