[yocto] tmp on NFS

[Luke (Lucas) Starrett]

I should clarify, the sanity check warning I'm referring to is about the Yocto build/tmp directory not /tmp as in the system level tmp dir.

Thanks, Luke.


-----Original Message-----
From: yocto-bounces at yoctoproject.org [mailto:yocto-bounces at yoctoproject.org] On Behalf Of Mike Looijmans
Sent: Wednesday, October 07, 2015 3:01 AM
To: yocto at yoctoproject.org
Subject: Re: [yocto] tmp on NFS

I can think of various things that would go wrong with tmp on NFS. One of the most obvious example would be to try and change the network configuration while running, and needing some temporary file to manage that.\

I think the expectation is that /tmp should be accessible at all times, and that it's local and (at least somewhat) volatile.

I tend to mount /tmp/ in RAM on all systems. Even my desktop. Not having to do wait for a device IO queue when performing actions in /tmp/ can greatly improve the responsiveness of the system.

If your application's /tmp/ storage requirements are such that they don't fit in RAM, I don't think /tmp/ is the place where they should be stored.



On 07-10-15 03:37, Luke (Lucas) Starrett wrote:
> Hi,
>
> Can anybody give a brief history of time on why using an NFS drive for tmp is
> necessarily a bad thing, and why we have a sanity check for it?  We’re doing
> this without any obvious side effects.
>
> I’m aware of the checks added by changes like this:
>
> patchwork.openembedded.org/patch/61107/
>
> However, I don’t see the reasoning/background documented as to exactly what is
> actually broken when putting tmp on NFS.  Is it time skew, problems with
> concurrent file access, something else?
>
> Thanks,
>
> Luke
>
>
>



Kind regards,

Mike Looijmans
System Expert

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