[Linux-ha-dev] Re: Shared disk file Exclusiveness control program
alanr at unix.sh
Thu Aug 9 08:21:29 MDT 2007
OKADA Satoshi wrote:
> Hi Alan and all,
>> Hi Alan,
>> Thank you for your comment.
>> This program isn't considered as a quorum module for now.
>> It was developed as RA, I mean, it provides an independent function
>> some effects to Heartbeat's internal behavior.
>> since we don't have familiar with a quorum module,
>> what are the requirements for it?
>> We have no problem with improving it, but it's not known exactly how we
>> should do.
I don't know exactly either, because I didn't write that code, but only
> For example, SF-EX accesses to disk periodically by the active node to
> keep holding lock.
> We think quorum module can not operate this. Are we wrong?
The quorum server module operates in a very similar way. It has to send
periodic heartbeats to the quorum server, or the quorum server would
take away its quorum. So, in that sense it's very similar. They are
sending packets, and you are doing disk I/O - but both have to do it
periodically, or it won't be able to keep quorum.
I have CCed Huang Zhen, who added the plugin interface for the quorum
modules, and who also wrote the quorum daemon itself.
I suppose I should go read the code, but I'm on traveling with my wife
right now, and until Monday am on holiday.
Alan Robertson <alanr at unix.sh>
"Openness is the foundation and preservative of friendship... Let me
claim from you at all times your undisguised opinions." - William
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