[Pacemaker] How to make a redundant structure of arbitrator?

[Yuichi SEINO]

Hi Jiaju,

Thank you for a reply.
I could understand some ways that the arbitrator is redundant.

Sincerely,
Jiaju

2012年3月27日22:38 Jiaju Zhang <jjzhang at suse.de>:
> On Tue, 2012-03-27 at 12:22 +0900, Yuichi SEINO wrote:
>> Hi Jiaju,
>>
>> Thank you for a reply. I understand the case that a arbitrator have to
>> be redundant .
>> And I want to ask two questions .
>>
>> 1. I think about a satisfied way. Its way is that we make a special
>> site of arbitrator.
>>     Can this way satisfy?
>>     For example, if a running arbitrator node is stop,  this node is
>> fail-over to a other node.
>
> Ok, no problem. If the boothd on the original arbitrator node fails, it
> can be started on another node to be functional, or just restarted on
> the original node to proceed, but please ensure that the IP address will
> be floating with the boothd as well. So, in this scenario, it seems that
> you have two machines on the 3rd site to be as an arbitrator, you may
> want to configure boothd as a primitive resource and let pacemaker
> manage it.
> If you have 3 machines on the 3rd site, you can also configure the 3
> machines as 3 different arbitrators.
> If you have 3 different sites (besides that 2 cluster sites) to put one
> machine each to be as arbitrator, it'll also be OK.
>
> If the running arbitrator node is stop, the ticket won't be failed over
> from one site to the other if that two sites and the connection between
> them are fine. However, the danger is: if the arbitrator is down for
> quite a long time, just at that moment, one site is down or the network
> connection between them is broken, the other site won't be able to get
> the ticket.
>
>>
>> 2. In the case " for example, you have 2 sites, and configure 3 arbitrators",
>>     if 1 arbitrators stop, the structure is 2 site and 2 arbitrators.
>>     In this case, because the number of instance is an even number,
>>     i think that the arbitrator can't stop anymore.
>>     Am I correct　think?
>
> Site itself is kind of arbitrator as well. So, if you have 2 sites and 3
> arbitrators, totally is 5. We allow that 2 of 5 can be down to make the
> booth work. Of course, the 2 should be two arbitrators or one site plus
> one arbitrator. If the failed 2 are two sites, booth doesn't work;)
>
> Thanks,
> Jiaju
>
>



-- 
Yuichi SEINO
METROSYSTEMS CORPORATION
E-mail:seino.cluster2 at gmail.com