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Ah, OK. Then all we need to see if the readv() was passed through or not.

Indeed! From earlier in the thread I wrote:

Right. Ceph can be perfectly healthy and performant and still not be fast enough to beat the request timeout. One thing you can monitor for is the ratio of data in / out of the cache process -- you can likely see this impact when there's much greater data in than out.

I still think this is a good thing to examine. It should be extremely obvious from Ganglia / Zabbix / your-favorite-host-monitoring-software whether 9 megabytes or 39 gigabytes is being sent to the host.

@osschar - to confirm, when the "pass through" logic is triggered, nothing goes into the cache, right?

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