Rados bench with a failed node

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Hi
I'm developing my own erasure code and I'm trying to run rados
benchmark on it. My experiment consists of writing objects, then while
reading them I stop an OSD and see how it affects latency.
While running this experiment with 'rados bench' I get an error after
stopping the osd:

benchmark_data_adm-1_3806_object8 is not correct!
read got -5
error during benchmark: -5
error 5: (5) Input/output error


Is it expected to fail like this?
Is there a way to bypass it or somehow perform my experiment?

Thanks,
Oleg
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