Change corosync monitor network

[hmontoliu]

Hello

I have a 3nodes HA cluster which is having network stabiltiy issues. Probably switching issues. Each node is connected to two networks (external which I beliebe it has issues and internal which is more reliable). Can I change corosync to use the internal network by editing totem's bindnetaddr? if so how should I procced?

Thank you in advance

 

[wolfgang]

Hi,

see
https://pve.proxmox.com/wiki/Separate_Cluster_Network

 

[hmontoliu]

Hi,

see
https://pve.proxmox.com/wiki/Separate_Cluster_Network

Thank you. That's exactly what I was looking for.

 

[hmontoliu]

Hi again

I have some additional questions after reading the manual https://pve.proxmox.com/wiki/Separate_Cluster_Network
https://pve.proxmox.com/wiki/Separate_Cluster_Network
Each node on the cluster has a single nic/single switch link to LAN (where it is currently configured corosync) and a two nic/two switch redundant link to NAS-ONLY-NETWORK.

Since the NAS network is more reliable than the LAN connection my idea was to migrate corosync to the redundant and reliable NAS network. However the manual stays:

«Storage communication should never be on the same network as corosync!»

* Why is so important to separate storage communication and corosync? Given that, in my case, the most reliable network is the storage one
* By "same network" means same *physical* network?
* Would be an error to migrate corosync to our NAS network?

Thank you in advance

 

[wolfgang]

* Why is so important to separate storage communication and corosync? Given that, in my case, the most reliable network is the storage one

Corosync makes per second min 50 multicast packes per node.
So the latency goes up because the Switch CPU have to work.
The most network storage react not good on hight latency.

* By "same network" means same *physical* network?

Yes also VLan is no solution.

Would be an error to migrate corosync to our NAS network?

You can use this networks if need must as second ring (Backup network).

 

[hmontoliu]

Perfectly clear. Thank you