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Feature #9981
closedosd: cache: proxy writes (instead of unconditionally promoting)
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Description
This should work similar to the read recency checks that don't always promote on first read, but give the cache osd a choice.
Initially, use a similar (same?) tunable as the reads.
In the future, we can implement other heurstics, like not promoting on write_full (or very large writes), or deciding based on the IO hints in the client request.
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