topic CSM serverfarm 'failaction' in Application Networking

CSM serverfarm 'failaction'

GBECHTEL_2 — Mon, 04 Oct 2010 16:37:32 GMT

Just a quick question regarding the 'failaction purge' serverfarm command. When you specify 'failaction purge', does the purge apply when you manually deactivate the serverfarm (as in manually marking the serverfarm and all its reals as no 'inservice')?

I know 'failaction purge' works when a real server fails the probe, but I wondered if it also closes sessions when you take down the serverfarm. We're running CSM code 4.2(9). Thanks.

Re: CSM serverfarm 'failaction'

litrenta — Mon, 04 Oct 2010 20:42:33 GMT

It will only purge on probe failure. no inservice will be graceful existing connections

preserved no new connections. If you want to tear down the connections after taking the real out of service do

clear mod csm x conn real y.y.y.y with xbeing slot for csm and y.y.y.y being ip of server.

CSM serverfarm 'failaction'

ajayku2 — Fri, 11 Jan 2013 10:51:31 GMT

This was answered sometime back in few discussion:

first, not all servers accept TCP connection to be reassigned to them.

This is because tcp requires 3-way handshake and keeps track of sequence/ack numbers.

Therefore, the servers need some way to exchange this information or to start in the middle.

On ace, we have 2 commands "failaction reassign" or "failaction purge".

The reassign is to simply move the connection to a backup server.

The purge is to kill the connection forcing the client to reopen a new one - this new connection will then be loadbalance to an active server.

CSM serverfarm 'failaction'

ajayku2 — Fri, 11 Jan 2013 10:57:20 GMT

Sorry the above is true for ACE.