On 04/24/2018 05:01 AM, Mohamad Gebai wrote: > > > On 04/23/2018 09:24 PM, Christian Balzer wrote: >> <snip> >>> If anyone has some ideas/thoughts/pointers, I would be glad to hear them. >>> >> RAM, you'll need a lot of it, even more with Bluestore given the current >> caching. >> I'd say 1GB per TB storage as usual and 1-2GB extra per OSD. > > Does that still stand? I was under the impression that with Bluestore, > the required RAM is mostly a function of the Bluestore cache size rather > than raw storage size (we're currently in the process of confirming this). > It is. The amount of storage doesn't matter, but the BlueStore cache is a per OSD config value indeed. So a 1TB of 4TB won't have a big difference in the amount of memory it uses in most situations. Setting the BlueStore cache to a higher value will improve performance though as RocksDB lookups are faster. Wido > Mohamad > >>> Regards, >>> >>> Florian >>> _______________________________________________ >>> 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 > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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