[Lustre-discuss] Question on setting up fail-over

Kevin Van Maren Kevin.Van.Maren at oracle.com
Mon Aug 9 11:08:20 PDT 2010


On Aug 9, 2010, at 11:45 AM, David Noriega <tsk133 at my.utsa.edu> wrote:

> My understanding of setting up fail-over is you need some control over
> the power so with a script it can turn off a machine by cutting its
> power? Is this correct?

It is the recommended configuration because it is simple to understand  
and implement.

But the only _hard_ requirement is that both nodes can access the  
storage.


> Is there a way to do fail-over without having
> access to the pdu(power strips)?

If you have IPMI support, that can be used for power control, instead  
of a switched PDU.  Depending on the storage, you may be able to do  
resource fencing of the disks instead of STONITH.  Or you can run fast- 
and-loose, without any way to ensure the dead node is really "dead"  
and not accessing storage (at your risk).  While Lustre has MMP, it is  
really more to protect against a mount typo than to guarantee resource  
fencing.


> Thanks
> David
>
> -- 
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