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Re: [Linux-cluster] Fence device, How it work

Lon Hohberger wrote:

On Mon, 2005-11-07 at 11:37 +0000, nattapon viroonsri wrote:
I tend to use APC AP7900 as fence device.

So when failover have occure backup node control APC to power cycle failnode.
But im not sure how kind of  this device work .
Is it  just power off or power cycle at outlet that fail node was pluged ?

I always wondered about this. If the node has a problem, chances are that rebooting does not fix it. Now if the node comes up semi-functional and attempts to regain control over the ressource that it owned before, then that could be bad. Should it not rather be shut-down so an human intervention
can fix it before it is being made operational again?

I/O fencing instead of power fencing kind of works like this, you undo the i/o block once you know
the node is fine again.


Michael Will
Penguin Computing Corp.
Sales Engineer
415-954-2899 fx
mwill penguincomputing com

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