Jumbo frames for Nutanix Cluster

Jumbo Frame is basically a ability to increase packet payload size which can be beneficial when processing a large amount of data through the network itself.

Nutanix AHV uses the standard Ethernet max transmission unit (MTU) of 1,500 bytes for all external communication by default. Jumbo frames are optional, because the standard 1,500 byte MTU still delivers excellent performance, but increasing the MTU can be beneficial in some scenarios

Default MTU vaule is 1500

Jubmo Frame MTU Vault is 9000

Nutanix recommanded to use Jubmo frame to use for Nutanix Volume to represent high Performance ISCSI Storage External Server which can help to increase Effciency for application such as oracle database connected to the Nutanix volumes .

Be sure to plan carefully before enabling jumbo frames. Configure the entire network infrastructure from end to end with jumbo frames to avoid packet fragmentation, poor performance, or disrupted connectivity.

Check the current configuratin :-

root@ahv# ovs-appctl bond/show
root@ahv# ip link | grep mtu


Reconfigure CVM to make changes :-

nutanix@cvm$ sudo ip link set eth0 mtu 9000 
nutanix@cvm$ sudo ip link set eth2 mtu 9000

To permanently modify the MTU so it persists through a restart, append the string ‘MTU=”9000“’ to the end of the following configuration files on the CVM:

nutanix@cvm$ sudo echo ‘MTU=“9000”’ >> /etc/sysconfig/network-scripts/ifcfg-eth0 
nutanix@cvm$ sudo echo ‘MTU=“9000”’ >>  /etc/sysconfig/network-scripts/ifcfg-eth2

host reboot is required hence follow the safe reboot task.

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