Dear All,

        We have 4 Hyper V VM installations on 2 HP DL 380 G8 servers and have they are connected to HP NSA 2040 SAN Storage through 6 Gbps Fibre channel. The physical machines are clustered.

Out of the 4, 2 are Clustered Hyper V's running Microsoft Dynamics AX 2012 R3 and we have 2 Clustered Hyper V for Database server running MS SQL 2012 R2.

The issue here is that the APP servers are slow in communicating with the DB server. The Hyper V's have a dedicated 4 * 1Gbps interface cards teamed and the packets are getting timed out. But from any other machine in the subnet the communications are proper.

When ever i try to copy a file from the DB server to the APP server using SMB share it kills my network, the copy will happen but after the copy is completed the network comes backup.

Its strange scenario. APP server 2 APP server smb copy is fine, and from DB to DB smb copy is fine but cannot copy between them.

Can anyone please help?

Thanks,
Sriram A Das

• Moved by Eric__ZhangMicrosoft contingent staff Tuesday, April 21, 2015 7:45 AM more related

Hi Sriram A Das,

Please first refer the following article to confirm you have configured a correct cluster communication nic.

Configuring Windows Failover Cluster Networks

http://blogs.technet.com/b/askcore/archive/2014/02/20/configuring-windows-failover-cluster-networks.aspx

Im glad to be of help to you!

Hi ALex,

     Thanks a lot for your support.

Found out the issue, it was with the NLB configuration. We changed it form unicast to multicast and it seems to be holding good.

Will update in due course.

Thanks,

Sriram