Hi, We've run into a weird issue on our current test setup. We're currently testing a small low-cost Ceph setup, with sata drives, 1gbps ethernet and an Intel SSD for journaling per host. We've linked this to an openstack setup. Ceph is the latest Hammer release. We notice that when we do rbd benchmarks using the rbd bench tool, the benchmark never really complete. It starts, run for 3 seconds and then stop, despite the rbd drive being 10 GB and the tool using 4k block size. If I set the rbd caching to false, the benchmark runs normally and complete after a few minutes. How can the rbd_cache affect the benchmark tool in this manner and does it has direct impacts on the openstack cluster running of this ceph setup? -- ====================== Jean-Philippe Méthot Administrateur système / System administrator GloboTech Communications Phone: 1-514-907-0050 Toll Free: 1-(888)-GTCOMM1 Fax: 1-(514)-907-0750 jpmethot@xxxxxxxxxx http://www.gtcomm.net _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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