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Hi all, I’ve been playing with Ceph across high latency high speed links, with a range of results.
In general, Ceph MDS, monitors, and OSDs are solid across thousand kilometre network links. Jitter is low, latency is predictable, and capacity of the network is well beyond what the servers can push. I get the obvious expected slowdowns
to do with quorum and other communications, the cluster remaining reliable and in sync. What is the generally accepted maximum latency for a usable Ceph cluster between nodes? I realise it’s quite an open ended question ,with quite a number of ifs and buts about it. I am however interested to hear what people have done in
production and accepted, and what tweaks have been done. For reference, I have an experimental cluster running across 12ms between the nodes, and while the IOPS itself is down, I’m able to write in at a few hundred Mbps which would cover many use cases. The latency was the obvious issue.
David Jericho Senior Systems Administrator AARNet Pty Ltd t.
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David.Jericho@xxxxxxxxxxxxx w.
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