ESXi 5 dvswitch and MTU settings

Edit: I'll post the config info here for anyone else looking for a quick "How To".  It's super simple but not obvious.

After you add a host to the DVSwitch, navigate to Configuration, Networking, vSphere Distributed Switch, manage virtual cards.

Here you can add virtual NICs that you can set the MTU value for each of your groups of port.  Hope this helps someone else.

I have a question about MTU settings.

In my scenerio I only have 1 2 port 10gig card at my host.  I have every port as a dvuplink to separate switches.

My question is, when you set the MAX 9000 MTU to support frames for ISCSI dvPortGroups, do all your other traffic in VM network exchanges 9000 thus, change d ' assign my stand alone equipment is 10/100/1000 MTU 1500.

so I guess what I'm wondering really is,

a guest virtual OS/machine running on this dvswitch in a dvportgroup, MTU is always maybe 1500? While he could talk to hold single device on the fabric.

I know to support ISCSI frames and must be supported from BEGINNING to END, mine is esxi to switch to the san.

so I just need a dvswitch dedicated for MTU 9000 and a dvswitch dedicated for MTU 1500 or 1500 traffic cannot exist in the 9000 switch?

I'm relatively new to the frames, so I will try to figure out how my design "should" be.

I do not have the budget to add more 10gig network adapters on each host.  I know that sounds bad but that is where we are. It would be just a waste of flow... I just don't need that much flow.  2 uplinks of 10gig already more than meet are needs.

I have attached a presentation of how visio I wanted to put this out, but once I started to think through MTU, I was like uh... which will not work, it will be?

Samples of Robert wrote:

My question is, when you set the MAX 9000 MTU to support frames for ISCSI dvPortGroups, do all your other traffic in VM network exchanges 9000 thus, change d ' assign my stand alone equipment is 10/100/1000 MTU 1500.

so I guess what I'm wondering really is,

a guest virtual OS/machine running on this dvswitch in a dvportgroup, MTU is always maybe 1500? While he could talk to hold single device on the fabric.

Allowing a large MTU on the dvswitch will not do damage to your virtual machines. It is easy to get confused about this, but the MTU setting on the switch, it's just that it will allow the biggest executives to 1518 bytes. The MTU size changed the switch will be invisible to your virtual machines and they will continue to use default MTU 1500 without problems.

In other words, you can have with 9000 VMkernel iSCSI adapters and virtual machines with 1500 on the same dvswitch.

Tags: VMware

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