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Scheduling replication to avoid bottle-neck updates

We have a circular master-slave setup where any one of the 2 servers
can become master at any time (by human decision). The two servers are
placed at geographically different sites. The servers contain à number

of databases which are all replicated both ways.
When we have full usage of one master ~500 inserts/updates per second,
the bandwidth between our sites becomes a significant bottle-neck. This

we can accept at database level not on server level, ie
- if database A on site B has a lag of 30min because of important
activity on database A on site A, it is acceptable.
- if database B on site B has a lag of 30min because of important
activity on database A on site A, it is not acceptable.
Is there a work-around? We never have updates concerning 2 databases in

the same query.
Creating multiple mysql servers at each site could be one, but that
means some 10-50 servers on every physical computer. What side-effects
does that create?
Johan Martinsson

Jul 23 '05 #1
0 1002

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