Support for Jumbo Frames is one of the major new features for ESX 3.5. Especially for the people who are using an iSCSI SAN configuring jumbo frames could be very beneficial. Instead of having an MTU(maximum size of transmitted packet) of 1500 an MTU of 9000 would be possible. That would cut out a lot of the iSCSI overhead. But [...]

During a VMware healthcheck at one of my customers I ran across the following error in /var/log/vmkwarning: “Memory is incorrectly balanced between the NUMA nodes of this system which will lead to poor performance. See /proc/vmware/NUMA/hardware for details on your current memory configuration.”