I think rados bench is actually creating new objects with each IO. Can you paste in the command you used? -Sam On Tue, Aug 20, 2013 at 7:28 AM, daniel pol <daniel_pol@xxxxxxxxxxx> wrote: > Hi ! > > Ceph newbie here with a placement question. I'm trying to get a simple Ceph > setup to run well with sequential reads big packets (>256k). > This is for learning/benchmarking purpose only and the setup I'm working > with has a single server with 2 data drives, one OSD on each, journals on > the OS drive, no replication, dumpling release. > When running rados bench or using a rbd block device the performance is only > 35%-50% of what the underlying XFS filesystem can do and when I look at the > IO trace I see random IO going to the physical disk, while the IO at ceph > layer is sequential. Haven't tested CephFS yet but expect similar results > there. > Looking for advice on how to configure Ceph to generate sequential read IO > pattern to the underlying physical disk. > > Have a nice day, > Dani > > _______________________________________________ > 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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