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Date:      Fri, 26 Aug 2016 17:27:19 +0200
From:      Ben RUBSON <ben.rubson@gmail.com>
To:        FreeBSD FS <freebsd-fs@freebsd.org>
Subject:   Re: [ZFS] ARC accounting bug ?
Message-ID:  <9A3B2699-B077-4F72-90A5-63D7E22BE652@gmail.com>
In-Reply-To: <91665D7B-D2EA-4A7F-BE8D-67BE238DAF6B@gmail.com>
References:  <C2642B73-83F2-4A1C-88BE-322F376861FF@gmail.com> <5B8C6663-5D21-4C03-AC69-CB7E70D3A6C2@gmail.com> <067ac0ed-1f2d-c9fb-de4d-ed5da62fe10c@internetx.com> <9EAAEEC5-0FFF-474D-9AD0-4447CD6B549B@gmail.com> <c45b36de-b43f-6eae-4187-142f1e5c3e48@internetx.com> <91665D7B-D2EA-4A7F-BE8D-67BE238DAF6B@gmail.com>

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I'm sorry but I still can't find out where do these ARC demand metadata =
misses come from.
In addition, why they are not cached, as my ARC is 1% used.
And why I don't see any disk activity to honour them.

I would really be glad if you could enlighten me :)

Many thanks again,

Ben



> On 26 Aug 2016, at 14:28, Ben RUBSON <ben.rubson@gmail.com> wrote:
>=20
> Yes Juergen, metadata only stores in ARC files' info (location in pool =
and some other useful info), not the user data.
>=20
> 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.
>=20
> Thank you for the links, I already read them before posting here, but =
I may have missed something.
>=20
> Ben
>=20
>> On 26 Aug 2016, at 14:16, InterNetX - Juergen Gotteswinter =
<juergen.gotteswinter@internetx.com> wrote:
>>=20
>> so, you know the difference between
>>=20
>> - metadata
>> - data
>>=20
>> ?
>>=20
>> if yes, what is your find actually doing in this case?
>>=20
>> regarding arc
>>=20
>> 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/
>>=20
>>=20
>>=20
>> 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 !
>>>=20
>>>> On 26 Aug 2016, at 14:01, InterNetX - Juergen Gotteswinter =
<juergen.gotteswinter@internetx.com> wrote:
>>>>=20
>>>> no bug, everything like i whould expect
>>>>=20
>>>> 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@releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC



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