Hi<
We have 3 ESXi 5.5 hosts. 2 are PowerEdge R815 and the 3rd is a PowerEdge R805.
I'm using iperf to test network performance as I've noticed that file copying and backups are slow from the VMs when they are on this problematic host.
This is the results using the same VM (Windows 2008 R2 and VMXNET3) and migrating it to the different hosts. I'm doing a iperf to the same VM I'm hosting from:
1st Host (R815) (Working OK)
[ 4] local 172.16.2.72 port 5001 connected with 172.16.2.72 port 52713
[ 4] 0.0-10.0 sec 2.54 GBytes 2.18 Gbits/sec
2nd Host (R805) (Working OK)
[ 4] local 172.16.2.72 port 5001 connected with 172.16.2.72 port 52713
[ 4] 0.0-10.0 sec 2.62 GBytes 2.20 Gbits/sec
3rd Host (R815) (Problematic host)
[ 4] local 172.16.2.72 port 5001 connected with 172.16.2.72 port 53063
[ 4] 0.0-10.0 sec 1.06 GBytes 912 Mbits/sec
As you can see the 3rd host is half the speed of the others. This test should hopefully exclude pNICs as it is all internal to the one host.
The things I've tried are:
1. Compare vSwitch settings to other hosts and confirm they are exactly the same.
2. Wipe and rebuild the 3rd host from scratch.
3. As a test move the physical connections on our switch to a new one (I didn't expect it to make any difference as the internal speed was slow)
4. Update firmware on everything for the server (Inline with the identical host 1)
I'm at a complete loss and this is really annoying me now. I really don't know what else to try. I'm hoping someone can help?
Thanks