[Lustre-discuss] Lustre MDS Queries

Daniel Ferber Daniel.Ferber at Sun.COM
Wed May 14 12:36:12 PDT 2008


I need to find out what MDS data I can access directly from an application,
via IO system calls or Lustre commands ­ assuming I am the owner of the
file. 

Or is any access to MDS data indirect, e.g. stat() and does that go just to
the MDS, or to the file as well?

I have a customer who has a large number of 1K files, that I suspect are
simply pointers to something ­ a crude MDS in other words. So on one hand
this is a perfect app for Lustre, just load the real files into Lustre and
the Lustre MDS points to the actual files!

But if the small files point to other objects that are not files, like a
physical file cabinet, are there system calls or commands that can be used
to load and read data into the Lustre MDS itself?

This probably isn¹t a good app for Lustre, and am asking in part to learn.

Dan



-- 
Daniel Ferber
Lustre DOE, DOD, and NSF Partnerships
Sun Microsystems
+1 651-204-0801 (Office)
+1 651-356-9481 (Cell)
Daniel.Ferber at Sun.com
Sun Internal: x29704


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