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@xxxxxxxxxxxx>
À: "Alexandre DERUMIER" <aderumier@xxxxxxxxx>
Cc: "Mark Nelson" <mark.nelson@xxxxxxxxxxx>, "ceph-devel" <ceph-devel@xxxxxxxxxxxxxxx>, "Mark Kampe" <mark.kampe@xxxxxxxxxxx>, "Sébastien Han" <han.sebastien@xxxxxxxxx>
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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