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?
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.pri...@profihost.ag>
À: "Alexandre DERUMIER" <aderum...@odiso.com>
Cc: "Mark Nelson" <mark.nel...@inktank.com>, "ceph-devel"
<ceph-devel@vger.kernel.org>, "Mark Kampe" <mark.ka...@inktank.com>,
"Sébastien Han" <han.sebast...@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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