Enable jumbo frames – MTU 9000 on ESX
vswitch AND portgroup needs to support MTU 9000 for optimal iscsi performance.
esxcfg-vswitch -l
esxcfg-vmknic -l
Change MTU on vSwitch
esxcfg-vswitch -m 9000 vSwitch1
Add vmk with MTU 9000 support
esxcfg-vswitch -AÂ ISCSI vSwitch1
esxcfg-vmknic -a -i 172.16.0.32 -n 255.255.255.0 -m 9000 ISCSI
Jumbo frames MTU 9000 test to an iscsi target
vmkping 172.16.0.10 -s 9000
