Configure Cluster MTU

The default packet size of the cluster is 1500 bytes; however, it is possible to change the Cluster's MTU through the mtuDB fact, which is stored in the file at /var/run/cluster-control/facts/switchfabric-mtu.

Note

This file does not exist by default, and will need to be created.

The default MTU is a special network named "@default"; therefore, to change the default cluster MTU to 9000, you would place the switchfabric-mtu file along with the contents @default 9000 in cluster-control/facts, as seen below:

root@hypercloud-dashboard~# echo "@default 9000" > /var/run/cluster-control/facts/switchfabric-mtu
root@hypercloud-dashboard~# cat /var/run/cluster-control/facts/switchfabric-mtu
@default 9000

The format of the file is:

<network> <mtu>

Danger

Ensure that your switch fabric supports the MTU you set!