active/active sites.

i haven't really read much on isessions but i want these two datacenters to be symmetric, and if i understand isessions correctly it's more along the lines of master/slave.

 

 

regarding the other solution - it looks very much like what i want to test, having nodes from BOTH datacenters in each pool. the only problem i'm not sure how to work around looks like this.

 

 

let's say www.fu.bar has two round-robin entries, one for dc1 and one for dc2. this would mean that most of the time a single user would hit one of those but sometimes request data from the other

 

 

1) dc1 up, wan up, dc2 up -> success in both locations

 

2) dc1 up, wan up, dc2 dn -> success in both locations

 

3) dc1 up, wan dn, dc2 up -> success in both locations

 

4) dc1 up, wan dn, dc2 dn -> failure in dc2 & no way to talk to dc1

 

 

kinda what i was looking to do was something along the lines of

 

 

if (i am up) and (remote is up) { return content }

 

if (i am up) and (remote is down) { return content }

 

if (i am down) and (remote is up) { break connection, round-robin goes to next ip }

 

if (i am down) and (remote is down) { return downtime page}

 

 

this would be easy if my company didn't want downtime pages :]