Re: [ogfs-dev]RE: "clusterizing" ext3

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"Stephen C. Tweedie" wrote:
> 
> Hi,
> 
> On Tue, 2003-07-08 at 04:05, Cahill, Ben M wrote:
> 
> > > Yes, that's possible for DLMs which include a "lock value block" (the
> > > IBM DLM has this).  But typically you don't have a huge
> > > amount of space
> > > in the LVB --- VMS had 16 bytes, and the IBM one is the same.
> >
> > I think OpenDLM (the version of the IBM DLM on sourceforge) can be set
> > to any arbitrary, but fixed, size, by a #define.
> 
> Yes, although I did see places in the code that don't use the proper
> #define so we'd have to do an audit to make sure we catch all the size
> assumptions.

The idea of the #define was to allow more flexible usage of the LVB for
different installations.  This was something that was not in the
original version of the lock manager, we added during the Linux port. 
It was never properly tested while we worried about getting DLM
functional at all, so we just left the #define to match the old setting.

As the original code was meant to emulate the VMS lock manager, it of
course matched VMS for the LVB.
> 
> <snip>
> 
> Cheers,
>  Stephen
> 

Peter
--
Peter R. Badovinatz aka 'Wombat' -- IBM Linux Technology Center
preferred: tabmowzo@us.ibm.com / alternate: wombat@us.ibm.com
These are my opinions and absolutely not official opinions of IBM, Corp.


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