Two production data centers and just purchased two i5800's

Hi,

in general we place one equipment by datacenter. the advantage of having a DRP/anoter DC is to having 2 completely independent sites. in case of problems on a site (even the worst problem: fire). the other can take over without problem.

For me the best alternative is to have one equipment in each site (that's what we did for all our customers and it's the best practice to adopt).

Regarding HA between your equipment:

Ed Summers message: Network failover is a heartbeat sent via IP and can be treated as any other network traffic. Depending on network conditions you may need to tune the timeout value (default = 3 seconds)...but 3 seconds is, relatively speaking, a long time. Just consider your overall HA strategy.

https://support.f5.com/csp/article/K2397

Regards