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Bug #756
closedOSD should have max write size
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Description
To prevent crashes if an incoming write is larger than the journal, we need an OSD max write size in the config. OSD journals need to warn if they are smaller than that max write, and if they get a too-large write, return ETOOBIG or similar.
Other portions of the system should then preemptively check against that max write size. (Maybe a separate task.)
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