Problem on the Physical NIC Adapters

[jerome27]

Hi Everyone!

We are experiencing slow response copying a single 2mb file from a virtual machine to a physical server. On the other hand, we get normal response copying the same file from the physical server to a virtual machine.

vmnic1, the network adapter being used by our Virtual machine is set to AUTO Negotiate but speed is 100 mb Half Duplex only while the other vmnic, vmnic0, being used by Service Console is also set to AUTO Negotiate and speed is 1000 mb Full Duplex.

I tried to set vmnic1’s speed to 1000 mb Full Duplex but the speed instead turns to DOWN so I set it back to AUTO Negotiate.

Hoping for your immediate response on this.

Thank you!

Regards,

Jerome

[Santhosh_vmware]

Hi Jerome,

you probably may have to check duplex settings of vmnic1 switch port on the switch side,if its auto try setting 1000 full duplex both on switch / host side..

regards

santhosh

[Texiwill]

Hello,

Other than switch port settings, ensure that the IRQ for the pNIC is not shared with something else. Some older HP DL585s for example had the ILO and first pNIC port sharing an IRQ which would bring the speed of the first pNIC down to 100MB and sometimes half duplex. I would verify that the hardware you are using does not have this type of issue as well.

Best regards,

Edward L. Haletky

VMware Communities User Moderator

====

Author of the book 'VMWare ESX Server in the Enterprise: Planning and Securing Virtualization Servers', Copyright 2008 Pearson Education. As well as the Virtualization Wiki at http://www.astroarch.com/wiki/index.php/Virtualization

[bggb29]

Have you looked at the ports on the pswtch, are there any error counts incremening if there are what counters

fast retrasnmits can be duplex issues.

Who is the pswitch vendor, have you tried a different port on the pwsitch..

[jerome27]

Hi Texwill,

We are using Dell PowerEdge 2950 ll and the two physical nics were onboard..How do I check for the IRQ on the ESX Server?

Thanks!

Jerome

[jerome27]

Hi bggb29,

I think there's no issue on the physical switch since on the other pnic which the service console is connected it transmits 1000 full duplex but on the other pnic where the virtual machines is connected it just transmits 100 mb half duplex.. Is there any other workaround on this matter.

Thanks!

Jerome

[jerome27]

Hi Santhosh,

If I selected the 1000 Full DUplex the pnic gets down. Is there any other workaround for this.

Thanks!

Jerome

[Santhosh_vmware]

Jerome,

How about 100 MB full duplex setting on switch and the host side ?.Also check for lan cable, sorry to be so basic

regards

santhosh

[jerome27]

Hi Santhosh,

Thanks for your response..

Actually, our main concern here is that when I transfer 2MB file physical to virtual the transferring of file is ok, but when I transfer from virtual to physical the transferring of file is very slow..

Hoping for your immediate response.

Thanks!

Jerome

[Santhosh_vmware]

Hi,

As others said did you find any errors on that NIC,you can find them in output #ifconfig -a,also run esxtop and then n to check network statistics .

regards

santhosh

[jerome27]

Hi Santosh,

How do I know if there are some errors if I type esxtop then n? Sorry if I'm being so naive with the CLI..:-(

Regards,

Jerome

[Santhosh_vmware]

Yes, esxtop with n option will do.

Sent from blackberry