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I just setup a test cluster at work to test this for you:

4 nodes, each node with 2x SAS SSDs, dual 25Gb NICs (one for front-end, one for back-end replication). The test pool is 3x replicated with Snappy compression enabled.

On a separate client (also with 25Gb) I mounded an RBD image with krbd and ran FIO:

  fio --filename=/dev/rbd1 --direct=1 --sync=1 --rw=write --bs=4096K --numjobs=1 --iodepth=16 --ramp_time=5 --runtime=60 --ioengine=libaio --time_based --group_reporting --name=krbd-test --eta-newline=5s
I get a consistent 1.4 GiB/s:

  write: IOPS=357, BW=1431MiB/s (1501MB/s)(83.9GiB/60036msec)



Thank you very much for the test. That gives me a good idea of what I could expect from my hardware, which is not quite that beefy.




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