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Re: [Linux-cluster] nodes halted with net lost

Hello Gordan,

Fencing works fine when the switcher is ok. I can fence a node from the other, and when the communication is lost the cluster fence the node that needs to fence. (I have a funny issue when I start the firewall and the communication was lost, the nodes fences each other...)

You say its normal that the nodes halt until the switch comes up, but I prefer that they reboots. I use fence_ipmilan agent to fence
but I dont know how to configure to do what I want

any idea?



2009/4/28 Gordan Bobic <gordan bobich net>
On Tue, 28 Apr 2009 17:21:13 +0200, ESGLinux <esggrupos gmail com> wrote:

> The nodes are connected through a single switcher (I know, this is a
> point of failure...). If I reboot the switcher, the two nodes halt.
> (through
> fencing it can be done because the go through the same switcher)

If they can't fence each other, cluster services will pause until fencing
be performed and verified. If this isn't happening (because the only path
between them with also covers fencing, is gone), then the behaviour you are
seeing is expected. But when the switch comes back up, they should resume.

If they don't resume when the switch comes back up, then that sounds like a
fencing configuration issue. Have you verified that fencing works and that
each node can successfully fence the other?

It is normally a good idea to isolate the cluster communication to a
dedicated interface. If you only have 2 nodes, you could just connect them
directly on a dedicated interface, without a switch.

> I don´t know if this behaviour is normal and if its possible to control
> it.
> I want that when this happens the nodes dont do nothing  or at least they
> reboot, not halt.

You can configure the action you want the fencing agent to perform. Look
up the man page for the fencing agent you are using. I thought the default
was to reboot (at least it is for the DRAC agent).


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