AW: Why are XFRs to Secondaries equally fast?
Klaus Darilion
klaus.darilion at nic.at
Thu Jul 27 13:37:51 UTC 2023
Hi Petr!
> > For example, there are 8 secondaries (Mumbai, LosAngeles, Melbourne,
> > Atlante, SaoPaulo...) to which the XFR took 2361 seconds.
> >
> > Are there some mechanisms in Bind that put multiple XFRs together into
> a
> > common stream? Or do you have any other ideas how it come that several
> > XFRs are equally fast?
>
> Are you sure all these transfers were _actually_ running in parallel?
Yes. I checked the logs on the secondaries too and also these logs say that the XFR were finished at the same second.
> I suspect it will boil down to some sort of configured limit like
> transfers-out
> transfers-in
> transfers-per-ns
> serial-query-rate
> which cause some transfers to serialize and reduce parallelism.
$ egrep 'serial-query-rate|transfers' *
named.conf.options: serial-query-rate 500;
named.conf.options: transfers-in 50; // number of total concurrent zone transfers from the masters to me
named.conf.options: transfers-per-ns 50; // number of concurrent zone transfers per master from the masters to me
named.conf.options: transfers-out 200; // number of concurrent zone transfers from me to my slaves
regards
Klaus
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