[Lustre-devel] some thoughts on COS
Alex Zhuravlev
Alex.Zhuravlev at Sun.COM
Mon Jun 30 04:04:14 PDT 2008
Nikita Danilov wrote:
> Alex Zhuravlev writes:
> > Hi,
> >
> > all access to an object can be broken into 3 phases:
> > 1) lock is acquired and used to modify data, no concurrent
> > access as data is inconsistent
> > 2) data is consistent, but uncommitted; thus same client can
> > access data, others can not
>
> Other clients cannot read uncommitted data, but they can safely
> overwrite them. Do we care about such use cases?
this is true for data, but most of metadata operations do read first.
thanks, Alex
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