How to activate the MTU 9000 after installation?

yannick
3 Posts

May 29, 2018, 8:53 pm

Hi,

The cluster is operational, but during the installation, I did not configure the MTU. How can I configure it without having to reinstall everything ?

Congratulations on this amazing project.

Thank you

Yannick

PS : please excuse me for my English, I use a translator.

admin
2,930 Posts

May 29, 2018, 10:49 pm

This is stored in the json config file /opt/petasan/config/cluster_info.json

An example

{
"backend_1_base_ip": "10.0.4.0",
"backend_1_eth_name": "bond0",
"backend_1_mask": "255.255.255.0",
"backend_2_base_ip": "10.0.5.0",
"backend_2_eth_name": "bond0",
"backend_2_mask": "255.255.255.0",
"bonds": [
{
"interfaces": "eth3,eth4",
"is_jumbo_frames": true,
"mode": "balance-rr",
"name": "bond0",
"primary_interface": ""
}
],
"eth_count": 5,
"iscsi_1_eth_name": "eth1",
"iscsi_2_eth_name": "eth2",
"jumbo_frames": [
"eth2",
"eth3",
"eth4"
],
"management_eth_name": "eth0",
"management_nodes": [],
"name": "demo"
}

of interest are "jumbo_frames" listing the nics and "is_jumbo_frames" for bond definition. You can also create a test config yourself by installing a single vm and select "Create New Cluster" during deployment,,you do not have to deploy other nodes but you can use the json file generated without messing with manual editing.

This file needs to be changed on all nodes, then all need to be rebooted. If you have many nodes you can use the file sync utility rather than copying it one by one:

/opt/petasan/scripts/util/sync_file.py /opt/petasan/config/cluster_info.json

yannick
3 Posts

May 30, 2018, 1:19 pm

Hello,

What responsiveness ! Thank you

Yannick