>>The results are with journal and data configured in the same SSD ? yes >>Also, how are you configuring your journal device, is it a block device ? yes. ~ceph-deploy osd create node:sdb # parted /dev/sdb GNU Parted 2.3 Using /dev/sdb Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) p Model: ATA Crucial_CT1024M5 (scsi) Disk /dev/sdb: 1024GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 2 1049kB 5369MB 5368MB ceph journal 1 5370MB 1024GB 1019GB xfs ceph data >>If journal and data are not in the same device result may change. yes, sure of course >>BTW, there are SSDs like SanDisk optimas drives that is using capacitor backed DRAM and thus always ignore these CMD_FLUSH command since drive guarantees that once data reaches drive, it will power fail safe.So, >>you don't need kernel patch. Oh, good to known! note that kernel patch is really usefull for theses cheap consumer crucial m550, but I don't see to much difference for intel s3500. >>Optimus random write performance is ~15K (4K io_size). Presently, I don't have any write performance data (on ceph) with that, I will run some test with that soon and share. Impresive results! I don't have choose yet my ssds model for my production cluster (target 2015),I'll have a look for this optimus drives ----- Mail original ----- De: "Somnath Roy" <Somnath.Roy at sandisk.com> ?: "Mark Kirkwood" <mark.kirkwood at catalyst.net.nz>, "Alexandre DERUMIER" <aderumier at odiso.com>, "Sebastien Han" <sebastien.han at enovance.com> Cc: ceph-users at lists.ceph.com Envoy?: Mercredi 17 Septembre 2014 03:22:05 Objet: RE: [Single OSD performance on SSD] Can't go over 3, 2K IOPS Hi Mark/Alexandre, The results are with journal and data configured in the same SSD ? Also, how are you configuring your journal device, is it a block device ? If journal and data are not in the same device result may change. BTW, there are SSDs like SanDisk optimas drives that is using capacitor backed DRAM and thus always ignore these CMD_FLUSH command since drive guarantees that once data reaches drive, it will power fail safe.So, you don't need kernel patch. Optimus random write performance is ~15K (4K io_size). Presently, I don't have any write performance data (on ceph) with that, I will run some test with that soon and share. Thanks & Regards Somnath -----Original Message----- From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Mark Kirkwood Sent: Tuesday, September 16, 2014 3:36 PM To: Alexandre DERUMIER; Sebastien Han Cc: ceph-users at lists.ceph.com Subject: Re: [Single OSD performance on SSD] Can't go over 3, 2K IOPS On 17/09/14 08:39, Alexandre DERUMIER wrote: > Hi, > >>> I?m just surprised that you?re only getting 5299 with 0.85 since >>> I?ve been able to get 6,4K, well I was using the 200GB model > > Your model is > DC S3700 > > mine is DC s3500 > > with lower writes, so that could explain the difference. > Interesting - I was getting 8K IOPS with 0.85 on a 128G M550 - this suggests that the bottleneck is not only sync write performance (as your S3500 do much better there), but write performance generally (where the M550 is faster). Cheers Mark _______________________________________________ ceph-users mailing list ceph-users at lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com ________________________________ PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify the sender by telephone or e-mail (as shown above) immediately and destroy any and all copies of this message in your possession (whether hard copies or electronically stored copies).
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