[ZFS] ARC accounting bug ?

[Ben RUBSON]

Yes Juergen, metadata only stores in ARC files' info (location in pool and some other useful info), not the user data.

I think "find" only needs metadata, as it does not read the files' content.
Which can be "verified" because :
- there is no IO at all on the pool (after the first find loop, once ARC has the needed metadata) ;
- there is no ARC demand data at all.
But I may be wrong, so of course feel free to correct me. Thank you.

Thank you for the links, I already read them before posting here, but I may have missed something.

Ben

> On 26 Aug 2016, at 14:16, InterNetX - Juergen Gotteswinter <juergen.gotteswinter at internetx.com> wrote:
> 
> so, you know the difference between
> 
> - metadata
> - data
> 
> ?
> 
> if yes, what is your find actually doing in this case?
> 
> regarding arc
> 
> http://dtrace.org/blogs/brendan/2012/01/09/activity-of-the-zfs-arc/
> https://www.patpro.net/blog/index.php/2014/03/19/2628-zfs-primarycache-all-versus-metadata/
> 
> 
> 
> Am 26.08.2016 um 14:06 schrieb Ben RUBSON:
>> Juergen, thank you for your answer.
>> So where do you think these ARC misses come from ? I can't find out :S
>> Thank you !
>> 
>>> On 26 Aug 2016, at 14:01, InterNetX - Juergen Gotteswinter <juergen.gotteswinter at internetx.com> wrote:
>>> 
>>> no bug, everything like i whould expect
>>> 
>>> Am 26.08.2016 um 11:40 schrieb Ben RUBSON:
>>>> uname -v
>>>> FreeBSD 11.0-RC2 #0 r304729: Wed Aug 24 06:59:03 UTC 2016 root at releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC
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>> 
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