Re: RBD fio Performance concerns

[Stefan Priebe - Profihost AG <s.priebe@profihost.ag>]

Am 23.11.2012 14:24, schrieb Stefan Priebe - Profihost AG:
> Am 23.11.2012 14:18, schrieb Mark Nelson:
>> Agreed with Alexandre, try putting the journal on a raw partition.
>> That's pretty insane!  What controller are you using again?

uhu crazy now i have the same with tmpfs... no idea what's going on here.

I've updated ceph to latest git next. Maybe i should rollback.

Stefan

>
> Makes no difference. No Controller. Just using the SATA 3.0 onboard
> Ports for each SSD.
>
> fio directly on SSD gives me 45.000 rand 4k write iops and 270Mb/s seq
> write speed. So that's ok.
>
> Stefan
>
>> 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
>>>
>>
--
To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html