High load on primary

Mark Andrews Mark_Andrews at isc.org
Thu May 3 23:55:15 UTC 2007

	notify-delay (BIND 9.4)

> Hello,
> I use Bind 9.3.4 and have a load-problem on my primary DNS-Server.
> Each morning I have for about three hours a huge amount of dynamic updates 
> in serveral zones. This alone is no problem.
> But I also have several secondaries which all want IXFRs after every update.
> These IXFRS seem to produce such a high load on my primary, that several 
> dynamic-updates get a "timed out" (and the ISC-DHCP only try the update once)
> ,
> so some PC have no DNS-entry and therefore have a problem.
> Now my question is how to reduce the CPU-load on my primary. I cannot reduce
> the number of dynamic updates nor the number of secondaries.
> My first try was to add the line "transfers-per-ns 1;" in the options-part of
> configurationfile on every secondary in order to let them do less IXFRs 
> at a given time. But to my (negative) surprise it didn't helped at all. The
> number of IXFRs didn't changed nor are they better spread over a bigger
> amount of time (which I hoped to gain from this change).
> Is there any other possibility to reduce the number of IXFR in a given
> amount of time?
> Or is there another idea? (No, I have no bigger server to use)
> Thanks for any help,
> Tom.
> -- 
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org

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