recursive-clients : recommended value for a high traffic recursive nameserver
blrmaani
blrmaani at gmail.com
Mon Nov 24 05:00:15 UTC 2014
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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