[Beowulf] Parallel File system as a storage Solution
hahn at physics.mcmaster.ca
Sat Aug 13 15:50:39 EDT 2005
> I'm one of the PVFS2 developers -- just warning you that I might be a
> bit biased :>
I wonder if you could offer some comments on how you see PVFS2 vs Lustre.
> Typical /home directory usage patterns are quite different from
> typical other file systems. Users have lots of small files
> (.dotfiles, directories, mail (if it's in maildir or mh format),
> source code). They run 'ls' (so end up calling stat(2) all the time.
yes - we actually force users to organize their files such that
they only get a fairly small /home quota (~200MB), but tons of
other space (/work (which is shared cross-cluster), /scratch,
node-local /tmp, etc). it's also worth pointing out that even the
underlying raid structure for these filesystems should really be
different: /home has fairly small blocks, for instance, so a big-stripe
raid5 is really a bad bet. but /scratch can be raid0, and /work something
like raid 50...
or that /home makes effective use of the pagecache, and /scratch is
> I think you're on the right track here: have an NFS-hosted /home
> directory where users can compile their applications. have a pvfs2
> /scratch file system where those applications can write their IO when
> they run.
hmm. it would be nice if FS's like Lustre and PVFS could be parameterized to
provide adequate /home performance as well, since it's not nearly as easy
to scale NFS.
anyone using fscache to speed up NFS in an HPC environment (even just
thanks, mark hahn.
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