But the OSDs themselves introduce latency also, even if they are NVMe.
We find that it is in the same ballpark. Latency does reduce I/O, but
for sub-ms ones it is still thousands of IOPS even for a single thread.
For a use case with many concurrent writers/readers (VMs), aggregated
throughput can be quite high.
Den 2018-01-29 kl. 19:32, skrev Wido den Hollander:
Although the difference between 0.4ms and 0.2ms is just, yes, 0.2ms
it's a 100% increase and does half the amount I/O you can do in a second.
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