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From André Warnier>
Subject Re: Application crash after Migrate to different ESX
Date Tue, 17 May 2011 20:57:48 GMT
הילה wrote:

>> I'll try explaining it differently.
> we use smart keep alive with this application. the smart keep alive does a
> connection to the DB, query something that relates to the application, and
> if everything turned out good, it returns state OK. if not ok, as in this
> case, it returns error page 500 which means- unable to run the specified
> query, because unable to connect to DB due to server side issue, or because
> DB unavailable and such.
> so after migrate, it disconnect the users, and the keep alive is unavailable
> (page 500), then it's available (state ok), then after couple of seconds
> again unavailable. then it returns to state ok and stay like this (scenario
> 1) or stays unavailable (page 500) until I restart the tomcat service and
> then display state ok for good (scenario 2).
I have no idea what this "smart keep alive" is, of which you talk above.  Is that a part 
of Tomcat ? If it returns an "error page 500", then it sounds more like a webserver in its

own right.

..and also taking into account your other posts about this issue :

We would of course try our best to help you here, but this is a mailing list dedicated to

Tomcat, and it sounds as if the problem you are having is more about a more general 
problem of infrastructure and combining different pieces together, of which only one is 

I believe that questions and answers on this list are not the appropriate way to resolve 
that kind of problem, and I believe that what you really need is some expert help, from 
someone who really understands the different pieces and how they (should) fit together.
Maybe these external consultants to which you referred ?

To give you an idea : you said initially that the problem occurs when a VM is migrated (by

Vmware) to another ESX server, and that when that happens the network connections are 
lost.  Well, I am not even sure that this is supposed to happen, if Vmware is configured 
correctly.  So you may be looking in the wrong place for a solution, to start with.
better to call in an expert, you would probably save time and money in the end.

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