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Setup: We have an environment that is heavily IO bound (we are reading hundreds of images on a web page and hundreds of connections at peak times). Our environment consists of 4 physical servers and 4 virtual servers tied to a load balancer. We are seeing the following error on ONLY our virtual servers when under heavy traffic:

The specified network name is no longer available.

The network name that the error is referring to is a UNC path (\\server01\images\blahblah.jpg) The RAM on the physical vs. the virtual servers is similar. Physical and virtual servers have 8GB main memory with a 2GB page.

Question: Has anyone run into this error before? This is ONLY happening on our virtual servers. We have since taken the virtual servers out of the load balancing cluster and error has not been seen since, even under the same load during peak times. Could this be a limitation of the virtual environment that only so many file handles can be open at once? or would this point more towards a network saturation?

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What operating systems are you using? Which hypervisor are the virtual servers running on? What's the load balancer? –  Dan Jun 18 '12 at 12:12
    
I would test on IP livel whether there are drops in traffic. This error simply means that NetBIOS resolution was impossible for that server. Still, you could test if DNS and IP-level resolution work to pinpoint the issue. –  Bojan Markovic Jun 18 '12 at 12:16
    
How busy are your virtual switch/es and their associated uplinks? this has NIC-exhaustion written all over it –  Chopper3 Jun 18 '12 at 12:22
    
@Dan I'm not the network administrator so I'm unfamiliar with the term "hypervisor" ... can you elaborate? –  Scott Vercuski Jun 18 '12 at 12:26
    
That's not a networking term, it's a server/OS term - to be honest I don't think this is the site for you. I don't mean to be rude so sorry if you take it that I am - but this site's for professionals who do this stuff all day long and it appears you might be out of your depth. Again no rudeness intended. –  Chopper3 Jun 18 '12 at 12:39
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