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* And you can also use it from inside your VMs, the results are usually similar to the above. Just note that the result also depends on the storage driver being used. Virtio is the fastest, virtio-scsi is slightly slower and everything else (like LSI emulation) is terribly slow. Results are also considerably affected by whether the RBD cache is enabled or not (RBD cache turns on automatically with cache=writeback/none). For random reads or writes, disabling RBD cache is faster.

First of all: