failover between server farms

[Amadou TOURE]

Hi,

I'm requesting advise on problem below :

- I have 2 datacenter with one server farm on each DC and 5 servers behind each server farm

- each server has 5k max connection limit on each server farm

- I want to be able to be able to failover to one SF to another when max connection for the server farm reach 25k (that mean each of 5 servers has reached its max conn)

Can I do that with partial-threshold ?

in Cisco documentation it's stated : "

Each time that a server is taken out of service (for example, using the CLI, a probe failure, or the retcode threshold is exceeded), the ACE is updated"

Would max-conn exceed be equivalent to "out of service" ?

thanks for any contribution

cheers

[gaursin2]

Hi,

I beleive Cisco ACE platform because of H/w design will not do failover for partial-threshold when primary server farms servers reached "MAXCONN" state and partial-threshold trigger. you will observe connection drop in that condition.

for your setup i will suggest to use simple backup server farm with no partial threshold. this work and when all the server in serverfarm are no longer usable (out of service or maxconn) back server farm will be activated.

[Amadou TOURE]

Hi Gaurav,

Thank you for your answer. I will Lab it and let you know the result.

thanks again.

[Cesar Roque]

Hi Amadou,

Yes, if all the rservers reach the max conn limit the ACE will failover to the backup serverfarm

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Cesar R
ANS Team