Try caused recursion / non authorative.
On Feb 23, 2010 3:47 PM, "Timothy Holtzen" <t...@nebrwesleyan.edu> wrote:
I have seen references out there about cache hit rates of 50-70% being
normal. However I'm confused as to how to measure/calculate hit ratio?
I can't seem to find any good references on how to find it. The only
thing I've been able to find is to do
("responses sent") - ("queries caused recursion")
but this would include queries for local authoritative zones. In our
particular case if I divide by the total number of queries I end up with
a number around 66%. Is this the correct way? In our particular case I
suspect that the majority of those responses are for local authoritative
zones. Wouldn't a more accurate way to measure cache performance be to
take
("non authoritative answer")-("queries caused recursion")/Total Queries?
In our case calculating this way would yield a number closer to 13%
which looks low when compared to the "normal" range listed above. How
are others calculating hit rate/ratio and what do you tend to see as
"normal"? Obviously normal can vary wildly depending on configuration
and what kind of queries a system receives. I'm just trying to get a
handle on how our cache is performing and what I should expect. Cache
hit rate seems to be an important metric when considering overall DNS
performance.
--
Timothy A. Holtzen
Campus Network Administrator
Nebraska Wesleyan University
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