Does the server you are running fio from have a valid ceph auth key? Can you check if you can kernel mount an RBD on the same server? > -----Original Message----- > From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Sascha Vogt > Sent: 06 December 2016 14:56 > To: ceph-users@xxxxxxxxxxxxxx > Subject: Re: Ceph Blog Articles > > 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 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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