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Hi @miniature-lock-53926, you can't modify that network. If you want to, for example, optimize storage replication traffic, you can create a dedicated network and use jumbo frames there.

And for the Storage Network, how can I set Jumbo Frames there?

You should create a new Cluster Network and, in the Uplink section, select the physical interface and the MTU you want to use. Once that is created, you must go to Advanced/Settings/storage-network and select the network you created in the previous step.

Ah, so it really is enough to change the MTU settings in the Harvester GUI. I was not sure about that. And we can only set this on a different bond than the mgmt-bo. Yet another reason to separate the real traffic from production VMs/Clusters from the Harvester MGMT Cluster traffic. Thank you