Why do you think that is slow? That's 4.5k write iops and 13.5k read iops at the same time, that's amazing for a total of 30 HDDs.
It's actually way faster than you'd expect for 30 HDDs, so these DB devices are really helping there :) Paul -- Paul Emmerich Looking for help with your Ceph cluster? Contact us at https://croit.io croit GmbH Freseniusstr. 31h 81247 München www.croit.io Tel: +49 89 1896585 90 On Thu, Jan 2, 2020 at 12:14 PM Ignazio Cassano <ignaziocass...@gmail.com> wrote: > Hi Stefan, using fio with bs=64k I got very good performances. > I am not skilled on storage, but linux file system block size is 4k. > So, How can I modify the configuration on ceph to obtain best performances > with bs=4k ? > Regards > Ignazio > > > > Il giorno gio 2 gen 2020 alle ore 10:59 Stefan Kooman <ste...@bit.nl> ha > scritto: > >> Quoting Ignazio Cassano (ignaziocass...@gmail.com): >> > Hello All, >> > I installed ceph luminous with openstack, an using fio in a virtual >> machine >> > I got slow random writes: >> > >> > fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 >> --name=test >> > --filename=random_read_write.fio --bs=4k --iodepth=64 --size=4G >> > --readwrite=randrw --rwmixread=75 >> >> Do you use virtio-scsi with a SCSI queue per virtual CPU core? How many >> cores do you have? I suspect that the queue depth is hampering >> throughput here ... but is throughput performance really interesting >> anyway for your use case? Low latency generally matters most. >> >> Gr. Stefan >> >> >> -- >> | BIT BV https://www.bit.nl/ Kamer van Koophandel 09090351 >> | GPG: 0xD14839C6 +31 318 648 688 / i...@bit.nl >> > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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