Re: RE: [Opendlm-devel] ODLM/OGFS Recovery

[snip]

>I did a little googling on DLM persistent locks and found this man
>page.  It looks like it is for trucluster.  It describes persistent
>locks and how recovery was done.  This one is similar to what
>I remember (which makes since since persistent locks were implemented
>for a large database software company and many vendors implemented
>what they asked for :) )
>
>http://h30097.www3.hp.com/docs/cluster_doc/cluster_16/MAN/MAN3/0024____.HTM
>
>I am a bit surprised that openDLM's persistent locks do not provide
>the same kind of functionality.  The whole point was to give an
>application a chance to do a recovery before granting more locks
>without having to keep the locks open.
>
>Are there any openDLM folks who can explain how these ORPHAN can be used
>in a distributed application if it cannot handle node death?  I thought
>node death was one of the big reasons for clusters and DLMs...
>
>Depending on the order of lock recovery seems to be asking for trouble.
>  
>
Sorry for late responding :)

I finally get the url you mentioned from Google's cache, thanks a lot 
for your help :)
And I'm trying to find how they store the orphan/persistent locks, but 
failed to get that. Do you have any ideas about that? AFAIK, it's the 
major barrier for current OpenDLM to support orphan/persistent lock even 
on node failure cases. (For worest case, the failed node holds one 
orphan lock, and it also acted as both directory/master for this lock. 
To avoid this happening, we need keep one copy for each orphan lock on 
each node, is that right?)

Thanks again,
Stan

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