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 >
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