Notify "storms"

[Mark Andrews]

In message <91aa34af1001181327q7f5de882vf47052ed39d87d51 at mail.gmail.com>, Todd 
writes:
> Good day all,
> 
> We've run into a problem with our DNS servers.  The way we update our
> masters is via a CVS Checkout and reload of the zones modified.
> Sometimes though, we need to reload the whole config for big
> changs/etc.  When that happens, all 6 masters (I know, we're getting
> rid of some) send notifies to all 80+ (I know, we're getting rid of
> some) slaves for all 1800 zones.  This causes all the slaves to verify
> all 1800 zones on 6 masters, which then delays the changes we made
> from actually getting to the slaves.  Right now it's about 2.5 hours
> for all slaves to do all zones.
> 
> We would like to make this better.  We're trying to figure out what
> mechanism might be limiting the rate at which the slave does SOA
> checks against the master so it can perform that step quicker.  We
> have looked at the zone transfer limits on the master/slave, but that
> is related to the transfer mechanism, not the SOA query.
> 
> Can anyone help with ideas on this?  Are we missing something obvious?

serial-query-rate

 
> Cheers,
> 
> Todd.
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org