Forum Discussion
Stuart_Page_131
Nimbostratus
NimbostratusDiscrepancy: Current Virtual Server Connections
I've noticed a discrepancy between the way the F5 cluster and Exchange measures CAS connections. When checking the number of current connections in the F5 virtual server stats for Exchange OWA (HTTP/HTTPS), I was very surprised to see that the number of connections was far higher (as much as 5 times higher!) than the number being reported by Exchange.
I was wondering if this is due to a difference in how "connections" are counted. If so, how are connections counted by the F5 virtual server stats?
nitassEmployee
I was wondering if this is due to a difference in how "connections" are counted. If so, how are connections counted by the F5 virtual server stats?
i understand F5 connection is tcp connection which is in F5 connection table. is it same as in Exchange?
- nitassi do not think number of tcp connections is going to be equal to number of user sessions.
Stuart_Page_131I'm performing session based queries on Exchange.
nitass_89166Noctilucent
I was wondering if this is due to a difference in how "connections" are counted. If so, how are connections counted by the F5 virtual server stats?
i understand F5 connection is tcp connection which is in F5 connection table. is it same as in Exchange?
- nitass_89166i do not think number of tcp connections is going to be equal to number of user sessions.
- Stuart_Page_131I'm performing session based queries on Exchange.
- eey0re
Cirrostratus
Are you sure you're not comparing OWA user sessions to TCP connections? There will typically be up to 8 times as many TCP connections as there are user sessions (due to the 8-connections-per-hostname limit in most browsers). 5 sounds like an expected multiple.
Otherwise I'd say wherever you're monitoring connections in Exchange must be counting things differently - perhaps not counting Keep-alive (but idle) TCP connections.
adiezma_1656Hi,
If you have a proxy in the middle of the connection, you maybe exists duplicated in the connections.
A. Diezma
- Stuart_Page_131No proxy in use. Thanks.
Hi Stuart, are you using OneConnect on the VIP? If so, BIG-IP will reuse existing server-side connections. You won't see a 1-to-1 ratio of client/server connections. You can see OneConnect profile reuse stats in the GUI or by running "show ltm profile one-connect "
This is on top of the total number of connections to the VIP being divided (hopefully) evenly among your pool members.
Mike
- Stuart_Page_131As far as I can tell, I'm not using OneConnect. Good to know though. Thanks!
