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Moif_Murphy
Enthusiast
Enthusiast

How VMware sees Physical Adapters

Hello,

I'm trying to reinforce my understanding of vSS and vDS for VCAP study and I'm after some clarification.

When we're talking about Physical Adapters in VMware and when I see them in the GUI, am I right in assuming we're talking about one of these:

http://img.systemaxdev.com/productmedia/htmlimages/cten/hp/Q165720-html.jpg

That is, a Physical Adapter with one port. And this looks like this in VMware:

vmnic1.png

If that is the case then I can relate to that quite easily. If a server has 8 NICs (or 6 in the example above) then that is correctly represented above. However, what if we're using one of these:

http://i00.twenga.com/computers/network-card/startech.com-4-port-pci-p_586834vb.jpg

A four port NIC? How is that represented in VMware? Am I right in assuming like this:

vmnic0123.png

What's confusing me is that when I create a vDS I'm asked how many uplink ports I need and underneath it says 'Maximum number of physical adapters per host'. Are these supposed to be one and the same thing?

vds.png

Because if we stick to the 8 separate physical NICs all with 1 port each then I can understand that but at work we have two 4 port NICs and that's skewing my perception somewhat.

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vmroyale
Immortal
Immortal

Correct on the first two points.

What's confusing me is that when I create a vDS I'm asked how many uplink ports I need and underneath it says 'Maximum number of physical adapters per host'. Are these supposed to be one and the same thing?

They are not. You can have 12 NICs in a box but only allow 4 of them to connect to the dvSwitch via uplink ports. The number of uplink ports determines the max number of physical NICs you could use.

Brian Atkinson | vExpert | VMTN Moderator | Author of "VCP5-DCV VMware Certified Professional-Data Center Virtualization on vSphere 5.5 Study Guide: VCP-550" | @vmroyale | http://vmroyale.com
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Moif_Murphy
Enthusiast
Enthusiast

vmroyale wrote:

Correct on the first two points.

What's confusing me is that when I create a vDS I'm asked how many uplink ports I need and underneath it says 'Maximum number of physical adapters per host'. Are these supposed to be one and the same thing?

They are not. You can have 12 NICs in a box but only allow 4 of them to connect to the dvSwitch via uplink ports. The number of uplink ports determines the max number of physical NICs you could use.

Ok, I think I'm confusing myself by trying to imagine how this all works with 2 x 4 port NICs when I should be thinking of the NICs as single ports.

I've almost got it, I need a few more hours breaking my lab I think.

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vmroyale
Immortal
Immortal

I should be thinking of the NICs as single ports.

Agree - a port is a port.

Brian Atkinson | vExpert | VMTN Moderator | Author of "VCP5-DCV VMware Certified Professional-Data Center Virtualization on vSphere 5.5 Study Guide: VCP-550" | @vmroyale | http://vmroyale.com
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