On 02/11/2014 10:06 AM, JinHwan Hwang wrote:
I thought that Ceph evenly distribute client request among replications. But I've seen example rule set that assign primary replication for ssd and other two for hdd. Can i assign something like read affinity for replication? Or Ceph always choose primary replication first except the primary crashes? If that so, Can i evenly distribute among replications? That will be very helpful for traffic distribution. I can't find documents or article about prioritization until now. Thanks in advance for any help.
Why would it help? Since it's not that ONE OSD will be primary for all objects. There will be 1 Primary OSD per PG and you'll probably have a couple of thousands PGs.
Eventually the traffic will smooth out just fine in most use cases.
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