Le 13/08/2018 à 16:58, Jason Dillaman a écrit : > > See [1] for ways to tweak the bluestore cache sizes. I believe that by > default, bluestore will not cache any data but instead will only > attempt to cache its key/value store and metadata. I suppose too because default ratio is to cache as much as possible k/v up to 512M and hdd cache is 1G by default. I tried to increase hdd cache up to 4G and it seems to be used, 4 osd processes uses 20GB now. > In general, however, I would think that attempting to have bluestore > cache data is just an attempt to optimize to the test instead of > actual workloads. Personally, I think it would be more worthwhile to > just run 'fio --ioengine=rbd' directly against a pre-initialized image > after you have dropped the cache on the OSD nodes. So with bluestore, I assume that we need to think more of client page cache (at least when using a VM) when with old filestore both osd and client cache where used. For benchmark, I did real benchmark here for the expected app workload of this new cluster and it's ok for us :) Thanks for your help Jason. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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