Yang Gongming,

As you know, I've not been able to locate the original paper, but I 
think it might have been authored by my colleague Ellard.

If we can get a copy of the document to which you are referring we'll do 
our best to respond to your questions.

Thanks,

Tim
---


On 12/02/08 02:20, yang wrote:
> Hi all,
> The "sun cluster white paper" have a picture in the desicription. I have some 
> question,from the picture , I can't figure out what is the process of replica.
> question1: in step 1, what is the "transfer commit"of"request + transfer 
> commit" means, and what is the "+" means.
> question2: in step 6,why use the dot line and send confirm to secondary? in 
> my mind , the client should send it to primary ,because secondary is offline 
> from the client's aspect.
> question3:in the step 5, why the primary need "+ confirm" ? replay means 
> confirm already.
> 
> based on my understanding, i think the replica will work like this:
> 1/client send a request to primary.(+transfer commit means need commit,yet i 
> don't know why transfer commit yet not only commit?)
> 2/primary do checkpoint and then send it to secondary.
> 3/secondary receive checkpoint and make confirm to primary
> 4/primary receive commit and then continue to response to the reply, and keep 
> the force log for the steps.
> 5/after finish , send client a reply with a flag to tell client to response 
> the confirm to himself or secondary(no link to primary,do primary don't need 
> the confirm. how client send confirm to secondary ,and secondary is 
> offline,so why send to secondary?)
> 
> In my mind , I think this picture only fit for one special kind of 
> service.yet I really do need to know whether the process is right and what is 
> the impaction from the picture should be.  
> 
> the checkpoint struction in code shows it contain 
>       replica::ckpt_seq_t minseq;
>       replica::ckpt_seq_t value;
> So I am wonder how to use this two values? 
> Thanks
> Edward

-- 

Tim Read
Staff Engineer
Solaris Availability Engineering
Sun Microsystems Ltd
Springfield
Linlithgow
EH49 7LR

Phone: +44 (0)1506 672 684
Mobile: +44 (0)7802 212 137

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