SharePoint 2013 App Server Failover

In the process of fail over testing of a new farm, my App servers seem to fail over correctly when I cleanly shut a server down (OS Shutdown).

However, when I test for fail over simply by disabling the network connection (via V Sphere), fail over does not work.

To clarify. I am testing fail over simply by using search. When I shutdown one of the two servers, search still produces results and the same when the other app server is cleanly shutdown.

While both servers are running, if I disconnect one from the network, I receive no results and the ULS log show a "Query time out error".

So the question, why does this happen and how can it be avoided? If anyone can shed some light on this it would be greatly appreciated.

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Walter CurtisSharePoint AEDAsked:
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Ryan McCauleyConnect With a Mentor Data and Analytics ManagerCommented:
Does the F5 properly report that the node is offline when the network connection is removed? Or do requests go properly to the two online nodes, but SharePoint is just still attempting to refer search requests to the downed node?

Also, after a period of time passes, do search queries start working properly again, or are they broken until you bring the downed node back online?
Walter CurtisSharePoint AEDAuthor Commented:
This is additional information I did not include in the original question.

As described above, search produces no results when the network connection is disabled, however on the app server directly, (access via host file), I am able to search and I do get search results. It is just when coming in over F5 (load balancer) and hitting one of the three web front ends that I receive no search results. (Keep in mind, there is still one of the two app servers running during this fail over testing.)

Hope that additional information helps me get some bites on this question.

Walter CurtisSharePoint AEDAuthor Commented:
Thanks for the feedback -
As far as I know, the apps servers are not load balanced by the F5, just the 3 WFE servers. Considering that all request come in through the WFE's, how does a WFE know where to send the search request?

As to the second point. excellent question that I don't have an answer to because I didn't run the fail over test more than a few minutes. I will run a test again today after hours and see if there is a period of time when it might come back up.

Many thanks for the thoughts and questions, they help me think about the solution in a new light.
Walter CurtisSharePoint AEDAuthor Commented:
Thanks for the information. I am still testing but your suggestions helped greatly.
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