Joe wrote:
I've tried to look at the code many times. But, as a clustered file
system is a complex thing, it gets hard to figure out what it's all
about. I tried to find a "big picture" documentation, at least for
on-disk layout. The only nearest thing i've found is :
http://opengfs.sourceforge.net/docs.php , which is the documentation
written at the time OpenGFS forked from Cistina's code. Although
principles may still be the sames (or not ?), the code has obviously
changed and on-disk layout may not be the same, too.
So, is there some sort of documentation about the principles found in
GFS (not a design doc, i've read
/usr/src/linux/Documentation/stable_api_nonsense.txt) ? This would
much help anybody who wishes to enter the code to do it more
efficientely...
Thanks !
Hi Joe,
I agree that there isn't much good design information out there
regarding GFS.
That might be because it started out as a proprietary product before Red
Hat open-sourced it.
There are some comments in the kernel's gfs_ondisk.h include:
http://sources.redhat.com/cgi-bin/cvsweb.cgi/cluster/gfs-kernel/src/gfs/gfs_ondisk.h?cvsroot=cluster
Perhaps I'll start working on a GFS1/2 design whitepaper based on some
of the information I've gathered.
Regards,
Bob Peterson
Red Hat Cluster Suite
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