Default nastavenie je vyuztie jedneho jadra pre vmotion.

varianta 1 zvysit pocet vmotion vmkernel interface

With each created VMkernel interface that is enabled for vMotion, a new vMotion stream is spun up. Each stream containing the helpers as discussed. The multiple stream helpers assist in putting more data on the vMotion network and by doing so, utilization more bandwidth to copy the memory pages across the vMotion network, reducing the time it takes to get to memory convergence between the source and destination ESXi host. That results in vMotion operations being completed faster.

A single vMotion stream has an average bandwidth utilization capability of 15 GbE. When we look at various NIC speeds, that lead to the following:

• 25 GbE : 1 stream = ~15 GbE
• 40 GbE : 2 streams = ~30 GbE
• 50 GbE : 3 streams = ~45 GbE
• 100 GbE : 6 streams = ~90 GbE

That means that you would need six vMotion VMkernel interfaces on a single ESXi host to be able to use the available bandwidth, using a 100GbE NIC, efficiently.

Option 2: Tune Single vMotion VMkernel Performance

Docieli sa rozlozenie na viacere jadra

REF:

https://blogs.vmware.com/vsphere/2019/09/how-to-tune-vmotion-for-lower-migration-times.html