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I peaked at another thread regarding this, and I am trying to figure out if this change as if it really provided any performance enhancements over the the default MTU. My take is that there really isn’t much reason NOT to have jumbo frames enabled end-to-end. It doesn’t mean all packets will be sent using MTU, but rather that larger than byte packets will be used when they can be.

On your storage and vMotion networks, jumbo frames are recommended anyway, so you may as well do jumbos all the way around. Just make sure all of your switching is configured this way, or else you’ll lose access to your hosts. Hence the part about making sure the switching is configured that way, and making sure its configured end-to-end.

Brand Representative for StarWind. The first thing you need to determine is the maximum packet size your hosts, guests and workstations can support without fragmenting before you start making the change infrastructure wide.

Jumbo frames between the host and your SAN will provide increased performance as long as the NICs, switch and SAN all support the same size frame without packet fragmentation never assume that the documentation is perfect, the firmware or driver level of any piece of hardware can cause issues.

You’ll need to use a packet analyzer like Wireshark to determine what your level of packet fragmentation is to determine a baseline and you will also need to read the TID’s regarding the effects of TCP offloading both on performance and «ghosts» that you may see in the packet trace. Problem is, lots of people attempt to do that and fail and something goes wrong and they can’t figure out why all for a gain that often they cannot even measure. I disagree that it should not be enabled, but definitely agree that there is risk if not done properly.

The most common issues being old or cheap switching equipment that may or may not support the same frame size like old Ciscos that would only go up to something like MTU if I recall , and the variations of , , etc. If you or whoever your network admin is does not know how to, or otherwise cannot get this lined up, then steer clear of jumbos.

It’s not worth it at that point until the situation changes. With that said, the most tangible benefits are greater throughput and best practices. VMware and pretty much everybody’s IP storage recommend it, and their cookbooks include it.

However, almost nobody particularly in the SMB space is going to miss the throughput, nor will they notice the decreased performance of fragmented packets that have to traverse the part of the network that doesn’t support jumbos usually firewalls, routers, etc.

VMware is a huge company, the often give conflicting advice or don’t take the time to understand the entire scenario. A best practice for a Fortune is not the same advice for an SMB in many cases. John is famous for recommending against deploying Jumbo Frames. Seen too many shops crippled by it. And when they get it fixed, find that it gained them nothing. Also critically missing is where do you want to enable jumbo frames?

On the data network? On the SAN? On a NAS? Somewhere else? This is my attitude. That may be a question more for your development or apps team. If yes, just mark sure it’s enabled throughout the entire pathway. That’s storage, network, compute in both directions. Ah Coding Horror, haven’t been there is a while.

Good stuff. I used to listen to Jeff’s podcast. I just ran a couple benchmarks one with 9K jumbo frames enabled. That’s a fairly significant difference using realistic write sizes, and debunks the claim that it ALWAYS provides a performance gain. To continue this discussion, please ask a new question. Get answers from your peers along with millions of IT pros who visit Spiceworks. What is your thoughts? Best Answer.

There’s a reason: incompatible network hardware. View this «Best Answer» in the replies below ». Popular Topics in VMware. Which of the following retains the information it’s storing when the system power is turned off?

Submit ». Verify your account to enable IT peers to see that you are a professional. Darth Hoody wrote: My take is that there really isn’t much reason NOT to have jumbo frames enabled end-to-end. John Pohlman This person is a verified professional.

Pure Capsaicin. The big reason is risk. The average use of jumbo frames lowers performance. No, Jumbo Frames are generally not recommended. Thx VMware is a huge company, the often give conflicting advice or don’t take the time to understand the entire scenario. StorageNinja This person is a verified professional. Darth Hoody wrote: With that said, the most tangible benefits are greater throughput and best practices.

Banjamin Dec 27, at UTC. This topic has been locked by an administrator and is no longer open for commenting. Read these next

 
 

 

Jumbo frames are supported only on VMxnet 3 and enhanced VMxnet – ESX Virtualization – 17 Replies

 

Но Сьюзан физически не могла примириться с тем, что электричество вырубилось. Он хотел их отключить. Мидж нажала несколько клавиш. Горячий пар пробивался через люк подобно вулканическим газам, какими бы незначительными они ни казались.