Re: application server and SQL server on same box fails

Bill Dossett wrote:

 

Hi,

 

I have a IIS application with SQL backend on ESXi5.1.  When I run them on the same host it fails after about 5 to 10 minutes.  I can still ping between them, but can't make an ODBC connection.  If I migrate either of the vms to another host, then it starts working again, and appears, to keep working.  A friend told me that this can be an issue as they are on the same vswitch and as it responds so fast that it basically gets jammed.  Has anyone else heard of this and if so is there any way to fix it?  As i only have two hosts at the moment, it means I can't take one down for maintenance...  I am addig  a third host soon, so if that's the case then I can work around it, but it certainly seems strange.

Thanks

Bill

Not saying your friend is wrong, but I have never heard of this.  I have run similar configurations in the past and have not had these issues.

When you say "it" fails, I wonder where in the chain of communication it is failing?  Can the IIS server telnet to the the TCP port on the SQL Server?  Does  SQL Server see the attempts to initiate the connection at all?