[Ocfs2-devel] 256 node limit

[Wim Coekaerts]

it would be entertaining to see how it even works... but uhm go ahead.
would be a good test we sure don't have the hardware to do that

On Wed, Jul 06, 2005 at 10:38:42AM -0700, Bruce Schwartz wrote:
> Thanks. From looking at the code it appears that the maximum number of nodes 
> are controlled by some #defines (OCFS2_NODE_MAP_MAX_NODES, O2NM_MAX_NODES) 
> and that bumping the number up to something like 300 should be a simple 
> matter. There is a note in the code that reads: "if we need more, we can do 
> a kmalloc for the map" which I would guess addresses the case where you'd 
> want thousands of nodes.
> 
> Is my reading correct? And would it be a bad idea to try to set up a 300+ 
> node OCFS2 system?
> 
> Thanks,
> Bruce
> 
> On 7/5/05, Sunil Mushran <Sunil.Mushran at oracle.com> wrote:
> > 
> > It's actually 255. Yes, that doc needs to be updated.
> > 
> > No, the algorithms did not play much role in setting this limit.
> > Guess, can say the limit is part arbitrary, part practical.
> > (That extra byte adds up pretty quickly.)
> > 
> > Bruce Schwartz wrote:
> > 
> > > Hi all --
> > >
> > > In the "what's new in OCFS2" document at
> > > 
> > http://oss.oracle.com/projects/ocfs2/dist/documentation/ocfs2-whats-new.txt
> > > it says that the 256 node limit is a software limit and could be
> > > lifted. Why is that limit there? Are there some algorithms that
> > > don't scale nicely with larger number of nodes? I'm guessing that
> > > there is more to it than saving a byte of RAM in a few data structures.
> > >
> > > Thanks,
> > > Bruce
> > >
> > >------------------------------------------------------------------------
> > >
> > >_______________________________________________
> > >Ocfs2-devel mailing list
> > >Ocfs2-devel at oss.oracle.com
> > >http://oss.oracle.com/mailman/listinfo/ocfs2-devel
> > >
> > >
> >

> _______________________________________________
> Ocfs2-devel mailing list
> Ocfs2-devel at oss.oracle.com
> http://oss.oracle.com/mailman/listinfo/ocfs2-devel