Hi, while we're happy running ceph firefly in production and also reach enough 4k read iop/s for multithreaded apps (around 23 000) with qemu 2.2.1. We've now a customer having a single threaded application needing around 2000 iop/s but we don't go above 600 iop/s in this case. Any tuning hints for this case? Stefan _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com