ZODB replication and high-availability across data centers

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Hi there,

we are currently investigating options for a large-scale solution
where the machines (ZEO clients and ZEO server) should be separated
across two data centers. Incoming traffic should be balanced between
both data centers. Automatic failover and online-replication are
desirable - "high-performance" is a must.

The well-known options are:

ZRS
(ZEO)
Relstorage on top of some RDBMS-related clustering/replication mechanism
NEO
DRDB
ZEORaid

Has anyone worked on such a setup or may share some experiences -
especially by using one of the options above across data-centers
(with a limited bandwidth inbetween and a higher latency compared to LAN).

Andreas

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