Re: RBD fio Performance concerns

[Mark Nelson <mark.nelson@inktank.com>]

Agreed with Alexandre, try putting the journal on a raw partition. 
That's pretty insane!  What controller are you using again?

Mark

On 11/23/2012 05:03 AM, Alexandre DERUMIER wrote:
> so correcly aligned...
>
> Maybe try to use journal directly on the full partition, without xfs ?
>
>
> ----- Mail original -----
>
> De: "Stefan Priebe - Profihost AG" <s.priebe@profihost.ag>
> À: "Alexandre DERUMIER" <aderumier@odiso.com>
> Cc: "Mark Nelson" <mark.nelson@inktank.com>, "ceph-devel" <ceph-devel@vger.kernel.org>, "Mark Kampe" <mark.kampe@inktank.com>, "Sébastien Han" <han.sebastien@gmail.com>
> Envoyé: Vendredi 23 Novembre 2012 11:49:10
> Objet: Re: RBD fio Performance concerns
>
> Am 23.11.2012 11:47, schrieb Alexandre DERUMIER:
>>>> when i switch the journal to the OSD Disk seperate partiton on each disk
>>>> (/dev/sdX1 for journal 1GB and /dev/sdX2 for OSD) i go down from 23.000
>>>> iops to 200 iops random 4k.
>> O_o , that's seem crazy...
>> Are you sure that your partitions are correctly aligned ? (starting first partition at sector 2048 is best for ssd)
>
> Model: ATA INTEL SSDSC2CW24 (scsi)
> Disk /dev/sdb: 468862128s
> Sector size (logical/physical): 512B/512B
> Partition Table: gpt
>
> Number Start End Size File system Name Flags
> 1 2048s 2342911s 2340864s xfs pri
> 2 2342912s 468860927s 466518016s xfs pri
>
> Stefan
>

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