Vsphere Mtu 9000 Full Production So

Lets take a quick look at the topic of VMware vSphere 6.5 Change VMkernel MTU size with the web client as well as with PowerCLI.

However, it is fairly straightforward with just pointing and clicking.

We then need to click the vmkernel port group and click the vmk nic and IP address.

Then click the pencil button which takes us to where we can modify the vmk nic settings.

Click the vSwitch above and the pencil icon above the vSwitch section.

The beauty of PowerCLI is that if you want to make mass changes, there is simply no way to do these kinds of bulk changes in the web client so PowerCLI is a much better option.

There are many great one liners out there written by Alan and others that are extremely useful making these types of changes.

If you get the error message Message too long it means somewhere on the way between your VMware host and the FreeNAS there is a limit not allowing MTU 9000.

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The FIs and Nexus 5000 do CoS based MTU and not interface based.

Tip: If the failing expression is known to be legally refer to something thats sometimes null or missing, either specify a default value like myOptionalVarmyDefault, or use when-present when-missing.

These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)myDefault, (myOptionalVar.foo).

I have good documentation for configuring jumbo frame support on the Nexus 5k and on ESX but nothing really specific for UCS.

All you need to do to enable jumbo frames is to enter the MTU to be 9000 in the MTU pulldown for whatever class the traffic is going to.

Its also given in the user guide - MTU drop-down list The maximum transmission unit for the channel.

Note This field is always set to fc for Fibre Channel.

Manish.

We currently do not have any QoS implemented so I was thinking that the QoS policies would not have any effect, but as you pointed out, everything falls into the Best Effort class.

I made the change to 9000 for the MTU on Best Effort and it works.

I had already set the MTU for the vNIC to 9000 which I assume is also required.

In Linux for example one would use ifconfig to set interface MTU etc.

In my scenario the configuration of the MTU value end-to-end would be: Virtual interface on the NFS storage System wide both Nexus 5020s Best Effort QoS policy on UCS vNIC Templates for the Service Profiles in UCS vSwitch in ESXi (this also sets the MTU of the physical uplink interfaces) vmknic for IP storage in ESXi Cheers, -R.

I also need to to change my Best Effort traffic to 9212 but all my traffic does indeed fall into this CoS.

Vsphere Mtu 9000 Full Production So

Im in full production so does anyone know the impact it may have on the FI vNICs or the current traffic passing through the interfaces.