Hi, no ceph read from the primary PG - so your reads are app. 33% local. And why? better distibution of read-access. Udo Am 2017-03-24 09:49, schrieb mj:
Hi all, Something that I am curious about: Suppose I have a three-server cluster, all with identical OSDs configuration, and also a replication factor of three. That would mean (I guess) that all 3 servers have a copy of everything in the ceph pool. My question: given that every machine has all the data, does that also imply that reads will be LOCAL on each machine? I'm asking because I understand that each PG has one primary copy optionally with extra secondary copies. (depending on the replication factor) I have the feeling that local reads will usually be faster than reads over the network. And if this is not the case, then why not? :-) Thanks for any insights or pointers! MJ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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