Our nameservers take upto 10KQPS (mostly NOERROR type most of the time). 

Twice or thrice a week, I have seen upto 10% of the queries are SERVFAIL and we 
have started exceeding the default value of 2000 for recursive-clients settings 
in BIND 9.9.x.

Is there a recommended value for recursive-clients option assuming huge number 
of SERVFAIL queries once in a 2/3 days?

I'm not convinced to increase it to some arbitrary huge number 20,000 or 
200,000. 

I am looking for answer like - if your peak SERVFAIL queries are 2000/second, 
then your recursive-clients value should be N.

Please help!

thanks in advance
Blr
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