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Re: [Linux-cluster] [Q] Good documentation about comman d line interface??



On Mon, 30 May 2011 11:06:45 -0400, Digimer <linux alteeve com> wrote:
> On 05/30/2011 10:49 AM, Hiroyuki Sato wrote:
>> Hello Digimer.
>>
>> Thank you for your advice.
>> It is very very useful information for me.
>>
>>> a) Forcing a node to power off, or does it just start an ACPI
shutdown?
>>
>> Maybe ok. I'll test it.
> 
> To test, hang the host (echo c > /proc/sysrq-trigger), then try to force

> it to power off with wol. If this succeeds, you are in business. I have 
> my doubts though.
> 
>>> b) Can you check that the node is successfully off using wol?
>>
>> I'm not sure, I'll test it.
> 
> Please do. If you can though, it will make IPMI far less needed. :)
> 
>> Could you tell me one more thing.
>>
>> Where fenced will call fence agent??
>> It is mean that  the following
>>
>>   * Can I check where fenced daemon will call fence_agent when I
>> execute fence_node??
>>     (that message send to master fenced, or localhost??)
>>   * And Can I check ``where are master''  with command?? (If fenced is
>> master-slave type)
>>   * Can I control master priority.
>>     (for example I want to specify gfs1, gfs2, gfs3 as fenced master)
>>
>> Thanks again
>>
>> Regards.
> 
> I'm not sure about the internals of cman, so I am not sure which machine

> actually sends the fence command. I do know that it has to come from a 
> machine with quorum, and I do believe it is handled by the cluster 
> manager. It's not like pacemaker where a DC is clearly defined.
> 
> I'll try to sort out how the internals work and will let you know.

Not sure where i got this information from (i think it was on this list),
but for sure: the node with the lowest ID, which is quorate, will take the
responsibility to call the fencing script


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