From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
Subject: Re: RBD fio Performance concerns
Date: Fri, 23 Nov 2012 11:31:15 +0100
Message-ID: <50AF5073.8070006@profihost.ag>
References: <CAOLwVUmJGZNaZsySsw8eQmLy1ZCha+AAGCp-5i42=mr0aKHMyA@mail.gmail.com> <3210b770-431e-44ed-8d86-4610de89dd92@mailpro> <CAOLwVUn5EAC4QaWgU+TkodcJea7ayKUANUpfzWUG+cTBunao5g@mail.gmail.com> <50ACF8C8.7020908@inktank.com> <50AD02AC.60802@inktank.com> <50ADFC23.2030208@profihost.ag> <CAOLwVUmp7wrfead8qX2BZPbyeN_JY_XBN+wkEWmbY6q1-5u0fw@mail.gmail.com> <50AE1107.5060606@profihost.ag> <CAOLwVU=VpDPg6iuZM=UFy5bcDm-Rm_dVRkeZrAu-DoFXp9cDKw@mail.gmail.com>
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To: =?ISO-8859-1?Q?S=E9bastien_Han?= <han.sebastien@gmail.com>
Cc: Mark Nelson <mark.nelson@inktank.com>, Alexandre DERUMIER <aderumier@odiso.com>, ceph-devel <ceph-devel@vger.kernel.org>, Mark Kampe <mark.kampe@inktank.com>

Hi,

when i switch the journal to the OSD Disk seperate partiton on each dis=
k=20
(/dev/sdX1 for journal 1GB and /dev/sdX2 for OSD) i go down from 23.000=
=20
iops to 200 iops random 4k.

Greets,
Stefan
Am 22.11.2012 13:50, schrieb S=E9bastien Han:
>> journal is running on tmpfs to me but that changes nothing.
>
> I don't think it works then. According to the doc: Enables using
> libaio for asynchronous writes to the journal. Requires journal dio
> set to true.
>
>
> On Thu, Nov 22, 2012 at 12:48 PM, Stefan Priebe - Profihost AG
> <s.priebe@profihost.ag> wrote:
>> Am 22.11.2012 11:49, schrieb S=E9bastien Han:
>>
>>> @Alexandre: cool!
>>>
>>> @ Stefan: Full SSD cluster and 10G switches?
>>
>> Yes
>>
>>
>>> Couple of weeks ago I saw
>>> that you use journal aio, did you notice performance improvement wi=
th it?
>>
>> journal is running on tmpfs to me but that changes nothing.
>>
>> Stefan
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