Hi Nick, m( of course, you're right. Yes, we have rbd_cache enabled for KVM / QEMU. That probably also explains the large diff between avg and stdev. Thanks for the Pointer. Unfortunately I have not yet gotten fio to work with the rbd engine. Always fails with > rbd engine: RBD version: 0.1.9 > rbd_open failed. > fio_rbd_connect failed. Regardless if I set the clustername or not (to either ceph or the fsid) and if I specify the clientname as ceph.client.admin, client.admin or admin. Any pointer what I might be missing here? Greetings -Sascha- Am 06.12.2016 um 15:49 schrieb Nick Fisk: > Hi Sascha, > > Have you got any write back caching enabled? That time looks very fast, almost too fast to me. It looks like some of the writes > completed in around 70us which is almost the same as a single hop of 10G networking, where you would have at least 2 hops > (Client->OSD1->OSD2). > > What are your write cache settings for qemu? _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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