> On 23 Oct 2019, at 04:00, I M <isabella.ghiu...@nrc-cnrc.gc.ca> wrote:
>
> Mark, SImon thank you for feedback!
>
> The connections between master to master is good same location but the one
> from to new DS slave on different location is poor, so this should imply to
> have 2agreements , also we are using memberof pluging , for each master
> host the memberof is excluded from replication ( cfg as fractional
> replication)
> and for master to slave ( I assume member off will not be excluded will be
> full replication)
> Than would make sense to have only one master to slave full replication
> agreement?
Think of it a different way - I like pictures with this
[ Write A ] <<-- repl -->> [ Write B ]
\
\ link a
\
\----> [ RO C ]
In the first scenario if something happens to Write A, or link a, or the repl
link you now isolate RO C such as:
[ Write A ] [ Write B ]
\
\ link a
\
\----> [ RO C ]
[ Write A ] <<-- repl -->> [ Write B ]
\
[ RO C ]
This way changes to Write B or Write A won't make it to C. And if the link is
"unreliable" then this is more likely to happen.
But if you have multipath:
[ Write A ] <<-- repl -->> [ Write B ]
\ /
\ link a link b /
\ /
\----> [ RO C ] <---/
Issues on repl, link a or link b will shield you from issues because the other
path will be selected to C.
So I'd advise you always try to have at least 2 incoming replication agreements
to any server in any topology
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—
Sincerely,
William Brown
Senior Software Engineer, 389 Directory Server
SUSE Labs
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