Hi, What makes this cluster a non-local cluster? 0'6 and 1 millisecond RTT latency seems too high for all-flash clusters and intense 4K write workloads. The upmap-read or read balancer modes may help with reads but not writes where 1.2ms+ latency will still be observed. Regards, Frédéric. ----- Le 1 Oct 24, à 18:23, Victor Rodriguez vrodriguez@soltecsis.com a écrit :
Hello,
I'm trying to get the most from a Ceph Reef 3 node clusters, with 6 NVMe OSD each. Each node is between 0'6 and 1 millisecond RTT. Obviously performance isn't as good as with local clusters, usually around ~0'2ms. 4k in Q1D1 I/O write request are the most affected by this, as expected, with a performance loss of around 70% from an all local cluster with similar hardware. In general, measurements match the increased latency.
Are there any guidelines about what to tune or adjust to get the most of this kind of setups with "high" latencies?
Thanks in advance!
Victor
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