Network Pauses

[goapps.us]

Hello everyone, 

I've been fighting an issue for a while now and I'm really not making any progress. The issue is simple, but tracking down the cause has been elusive! 

Facts: 

• MS 2012R2 Hyper-V cluster (scvmm 2012R2) 
• 4X B200M4
• 1340 VIC
• VMQ = Enabled on vNics that constitute the vSwitch in HV host
• RSS = Enabled on SMB Nics, management and Live Migration
• infrastructure firmware 2.2(5b)
• Blade firmware 22(5b) 
• ENic version 3.4.0.12
• FI's 6248 
• FI switching mode - End Host

Issue: When I boot a VM, there is a pause on my network. In many cases, clients connected to XenApp server will notice a warning in outlook. In other cases, user are reporting a 3 to 5 second "freeze" in their XenApp session.

If I look at the event logs on the exchange CAS and DAG servers,  I can see that access to the network was lost. I also did various PING tests while booting VM and I get the following: https://www.evernote.com/l/ADlulLi0eBVBpKXILKPxCNsWqXf91qdq4UQ

Any assistance from the community would be greatly appreciated. 

Best regards 

[Philip D'Ath]

I have a vague recollection of reading about someone else with the same issue on this forum and if turned out to be a firmware issue on the B200M4.  My memory is very grey now.

Are there any firmware updates available for the B200M4?

[goapps.us]

Hello Philip 

Yes there are some updates, but we have been observing this issue for a while and we have been through 4 firmware updates since June... 

I wish it was that easy. 

[goapps.us]

Hello everyone 

It looks like I found the cause of the issues. Basically, the issue is caused by the Load Balancing algorithm which is set to Dynamic. 

I will be changing the mode to Hyper-V port. 

Thanks