Hi Rick :) What is the life test implemented on the Netscaler? If it's "just" the ARS TCP port ping it will not be enough as LJ mentioned and you will have the same problems using the BigIP F5. I was recently at a customer site where the F5 did not detect that the ARS was out due to the "ping" on the ARS TCP port.
Indeed there are cases where an ARS server can just be "out" (not handling requests) but continue to accept connection on the TCP port. As LJ said, one of the option is to write a "real" life test using ARS Java APIs (for example): -> Login, -> Query on COM:Company to search for "- Global -", -> Logout, -> It would write a file somewhere, -> This file would be parsed by the Load Balancer to check if the ARS Server is answering requests and to exclude or include it from the Load Balancer, Best regards. Laurent. On 11 Jul, 2016, at 04:12 PM, Rick Cook <remedyr...@gmail.com> wrote: ** Mark, FWIW, we are seeing issues with Netscalers as well, on an 8.1 platform. Servers that are part and running get dropped from the LB, etc. We've been working with our system engineers on it, but it may be a limitation in the Netscaler architecture. We asked for F5s.... Rick On Jul 11, 2016 06:49, "Brittain, Mark" <mbritt...@navisite.com> wrote: ** Hi All I have two mid-tiers and two AR Servers in a server group with netscaler load balancing in-between. Had a situation where the second AR Server in the group stopped responding but the load balancing did not detect this and whole server group became inaccessible. Digging a little deeper into the load balancing determined the netscaler pings the per port but doesn’t go any deeper. So in this situation, the port was up and netscaler continued to push traffic to the hung server. Is there something better that netscaler can monitor that would detect when the AR Server stops? If not, is there any way to ensure that if one server quits, everything goes to the other server and users are not interrupted? ARS 7.6.04 SP5 ITSM 7.6.04 SP2 Mid-Tier 7.6.04 SP5 Thanks Mark Mark Brittain | Sr. Systems Engineer | 315.637.9337 O 315.882.5360 M 125 Elwood Davis Road | Syracuse NY 13212 This E-mail and any of its attachments may contain Time Warner Cable proprietary information, which is privileged, confidential, or subject to copyright belonging to Time Warner Cable. This E-mail is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient of this E-mail, you are hereby notified that any dissemination, distribution, copying, or action taken in relation to the contents of and attachments to this E-mail is strictly prohibited and may be unlawful. If you have received this E-mail in error, please notify the sender immediately and permanently delete the original and any copy of this E-mail and any printout. _ARSlist: "Where the Answers Are" and have been for 20 years_ _ARSlist: "Where the Answers Are" and have been for 20 years_ _______________________________________________________________________________ UNSUBSCRIBE or access ARSlist Archives at www.arslist.org "Where the Answers Are, and have been for 20 years"
