[Lustre-discuss] OST redundancy between nodes?

[Brian J. Murrell]

On Thu, 2009-06-25 at 10:21 -0500, Carlos Santana wrote:
> 
> I am confused about this. Will the files in that OST be unavailable or
> some of the files in that filesystem be unavailable?

Both.  An OST contains objects.  For singly striped files (the default),
a single object is the entire file (data).  So losing an OST means
losing the object which means losing the file (contents).

> My impression is that lustre would stripe file data across many OSTs
> in terms of objects.

It *may*.  By default it does not.

> So wouldn't failure of one OST will potentially
> corrupt the files which have stripes/objects stored over that OST?

Yes.  This is the other side of the "both" I mentioned above.

b.

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