[Linux-cluster] power controller is interal/loss of pwer prevents failover: any ideas

Riaan van Niekerk riaan at obsidian.co.za
Mon Sep 11 15:31:14 UTC 2006

Lon Hohberger wrote:
> On Fri, 2006-09-08 at 11:16 -0700, Rick Rodgers wrote:
>> Does anyone know of a good solution to providing good failover 
>> for somthing like a Dell 1850? The issue here is that the power 
>> souce plug in the back provides power for both the internal power
>> controller
>> and the node itself. So if you pull the cord it will not failover
>> because
>> it can not Stonith the failed node (power controller is down also).
> Generally, you can't handle this without external fencing.
> https://www.redhat.com/archives/linux-cluster/2006-September/msg00026.html
> -- Lon

Lon - having reread that previous posting of yours, and esp the last 

(c) ... If a host does a "graceful shutdown" when
you fence it via IPMI, you need to disable ACPI on that host (e.g. boot
with acpi=off).  The server should turn off immediately (or within 4-5
seconds, like when holding an ATX power button in to force a machine

Just so I am absolutely sure about this: Is the above the only scenario 
when would have to disable ACPI? e.g. a graceful shutdown is easy to 
spot. If I don't see one in the logs, that means I can leave ACPI on?

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