Re: RBD fio Performance concerns

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

*arg* don't do bandwith limit tests to 10Mbit/s in parallel...

Am 23.11.2012 14:33, schrieb Stefan 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
>>>>
>>>
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