On 04/12/2016 01:48 AM, Christian Balzer wrote: > On Mon, 11 Apr 2016 09:25:35 -0400 (EDT) Jason Dillaman wrote: > > > In general, RBD "fancy" striping can help under certain workloads where > > small IO would normally be hitting the same object (e.g. small > > sequential IO). > > > > While the above is very true (especially for single/few clients), I never > bothered to deploy fancy striping because you have to plan it very > carefully, as you can't change it later on. > > For example if you start with 8 OSDs and set your striping accordingly (as > Alwin's example suggested) but later add more OSDs you won't be taking > full advantage of the IOPS availalbe. I didn't think about that, thanks for pointing that out. As we have a mixed workload on our new cluster, VMs and cephfs for login directories and sources, I am definitely going to test these settings. > > Christian > Thanks for your replies. -- with best regards, Alwin Antreich IT Analyst antreich@xxxxxxxxxxxx Cognitec Systems GmbH Grossenhainer Strasse 101 01127, Dresden Germany Geschäftsführer: Alfredo Herrera Amtsgericht Dresden, HRB 20776 Tel.: +49-351-862-92 0 Fax: +49-351-862-92 10 info@xxxxxxxxxxxx http://www.cognitec.com VAT ID: DE 222661897 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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