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Severe Network issues with Exchange 07 in ESXi

Posted on 2009-04-06
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Last Modified: 2012-05-06
I recently migrated our Exchange 2007 server from VMware server to a new server running 3i 3.5.0 build 12369, I used VMWare standalone converter on the vmdk. I am getting extreme latency on the NIC, even pinging other machines within the same host and vswitch. I have 5 other virtuals on this system and none have the same problem.

Running on a Proliant DL385, dual opteron 2.3 quads, 16gb ram. It's just a standalone ESXi with high med and low priority resource pools Exchange is alone in the high. There are 6 VMs total though one is powered off. Storage iscsi off a netapp fas270. iSCSI is in a seperate dedicated network and I have a dual port iSCSI HBA in the server. I have two physical NICs dedicated to the network the problematic vnic is in.

So far I've installed VMWare tools, uninstalled then reinstall again. Tried e1000 and enchanced vmxnet NICs.
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Question by:CSGRP
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Expert Comment

by:Veerappan Sundaram
ID: 24087024
Do you have any hidden NICs on this VM?
  1. You can check this if you open the properties of the NIC(s) and (do nothing) just Apply - if you get the warning that this IP address is already assigned to another NIC on this machine, then you have a hidden NIC.
  2. Use WMIC command to find the hidden device. If you have any NIC with very few metrics set and without deviceID then you have a hidden NIC.
  3. Try changing the default gateway on the current NIC and try to traceroute to another machine on a different network and check is it following the route you specified. If not, you have a hidden NIC.
You need to remove that first.
>>>>Veera.
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Expert Comment

by:kumarnirmal
ID: 24087953
I suggest that you check your Speed and Duplex Configuration of the NICs connected to the vSwitch on the
Exchange Server Port Group. If its set to Auto Negotiate, please change them to manual and set the speed to Fast Ethernet or Gigabit Ethernet and speed to Full Duplex or Half Duplex as per your Network Architecture.
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Author Comment

by:CSGRP
ID: 24088338
I do indeed have a hidden NIC.  As part of my initial troubleshooting process I removed the e1000 nic and added a vmxnet.  Is this:
http://www.nthelp.com/NT6/hiddennetworkcard.htm

The best way to delete it?  It needs a reboot so I need to wait til after hours.  Promising catch though.

kumarnirmal, I will try your suggestions as well.
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CSGRP earned 0 total points
ID: 24306763
I ended up building a new Exchange virtual on a different SAN and migrating everything to it.   I think our NetApp was just collapsing under the load.
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