The drive will actually be writing 500MB/s in this case, if the journal is on the same drive. All writes get to the journal and then to the filestore, so 200MB/s is actually a sane figure.
Jan > On 11 Dec 2015, at 13:55, Zoltan Arnold Nagy <zol...@linux.vnet.ibm.com> > wrote: > > It’s very unfortunate that you guys are using the EVO drives. As we’ve > discussed numerous times on the ML, they are not very suitable for this task. > I think that 200-300MB/s is actually not bad (without knowing anything about > the hardware setup, as you didn’t give details…) coming from those drives, > but expect to replace them soon. > >> On 11 Dec 2015, at 13:44, Florian Rommel <florian.rom...@datalounges.com> >> wrote: >> >> Hi, we are just testing our new ceph cluster and to optimise our spinning >> disks we created an erasure coded pool and a SSD cache pool. >> >> We modified the crush map to make an sad pool as easy server contains 1 ssd >> drive and 5 spinning drives. >> >> Stress testing the cluster in terms of read performance is very nice pushing >> a little bit over 1.2GB/s >> however the write speed is pushing 200-300MB/s. >> >> All the SSDs are SAMSUNG 500GB EVO 850 PROs and can push 500MB/write speed, >> as tested with hdparm and dd. >> >> What can we tweak that the write speed increases as well over the network? >> >> We run everything over 10Ge >> >> The cache mode is set to write-back >> >> Any help would be greatly appreciated. >> >> Thank you and best regards >> //Florian >> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
