Friday, February 4, 2011

VMWare data traffic with jumbo frames

Set the jumbo frames on vSwitch1 (which I am using for NFS). Log on to the console of the ESX host, and type:

esxcfg-vswitch -m 9000 vSwitch1

# remove the old vmkernel for storage which is on MTU 1500

esxcfg-vmknic -d "VMkernel - Storage"

# add the vmkernel back for storage again with MTU  9000 (vmkernel has ip 192.168.1.2)

esxcfg-vmknic -a -i 192.168.1.2 -n 255.255.255.0 -m 9000 "VMkernel - Storage"

Now the vSwitch1 and NFS vmkernel are using MTU 9000, and if your physical switch and SAN are configured for jumbo frames too, you should have a speed increase.

1 comment:

  1. Very informative stuff! thanks for sharing this with me.. please keep updating. have bookmarked!!

    Windows Guru

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