64MB is pretty large for a rados bench object - most of the interfaces above rados stripe at a 4MB boundary. It could be that larger sized writes like those require adjusting various knobs in the OSD. Do you see the same thing happen with 4MB work workloads? What are your EC profile(s)? On Wed, Aug 9, 2017 at 4:44 AM, Oleg Kolosov <olekol@xxxxxxxxx> wrote: > Hi > I've began experimenting with rados bench and I've noticed bizarre > behavior for jerasure and lrc plugins. I'm writing very large amounts > of data: ~2000 objects of size 64MB. > When reading the data with 9 parallel client, I'm noticing a linear > increase in latency around the middle of the read experiment (latency > was steady up to that point). > Is that an expected behavior? > How can it be explained? > > Thanks, > Oleg > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Kyle Bader -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
