MR_RJ
Apr 29, 2009Cirrus
Draining issues with Ms IIS and F5 LTM/BigIP 9.4.6
Hi,
Maybe this question doesn't belong in this forum but since it involves the LTM and load balancing I'll post it anyway since there must be others out there with similar issues.
We have a environment like this:
|Webfront1 MS IIS| |Webfront2 MS IIS|
----LTM-HA-PAIR----
|Appserver1 MS IIS| |Appserver1 MS IIS|
The Appservers are LBing HTTP traffic without persistance of any kind.
...when im trying to drain Appserver1 by setting the node to disabled, most of the connections will drain out but there is always 7-10 connections that wont. Something is keeping these ones alive from the webfronts.
I can list them in the LTM from CLI, I can see the traffic in the IIS logs.
The only way I can "solve" this is by restarting the IIS so the LTM notice it as down (at least I think it does, the connections is zeroed anyway).
Do anyone have any ideas how to do a nice and normal draining, is there any command I can run on the MS/IIS to clear some cache or on the LTM to force a TCP-reset to the active connections to the disabled node?
I've spent plenty of time trying to solve this, googling, opening cases to F5 support etc.
Help? =)
//Robert