fence device

[jagan]

Hi, can i use netgear gs108tv2 switch as fence device? And is proxmox commands is common to all vendor switches?can any one tell me what are the switches supports fencing.thanks in advance

 

[Richard]

can i use netgear gs108tv2 switch as fence device?

No - a fence device is not a(n IP) switch!

A fence device removes the power from a server if it cannot be reached any more in a cluster network.

 

[mir]

A switch is perfecly valid as a fence device. See the wiki.

 

[alatteri]

A switch is perfecly valid as a fence device. See the wiki.

Link to appropriate wiki?

 

[mir]

http://pve.proxmox.com/wiki/Fencing#Fencing_using_a_managed_switch

 

[Richard]

A switch is perfecly valid as a fence device. See the wiki.

But Power off/on is not possible with this solution!?

And: Does it make sense to isolate a node which is already not reachable in the network?

 

[NdK73]

The important part is that you "permanently" isolate the failed node both from users and storage. So even if it comes back online it can't be reached and can't alter disks.
That means that if you have a DAS as shared storage you can't just fence a node using a managed IP switch: the VM could still be running and updating data on the storage even if the network connection is not working.
On the other hand fencing by IP switch is perfectly fine if you're using iSCSI and fence all interfaces of the failed node.