[Lustre-devel] "Simple" HSM straw man
Aurelien Degremont
aurelien.degremont at cea.fr
Thu Oct 16 07:09:09 PDT 2008
Nathaniel Rutman a écrit :
> Ok, I've been told I'm dead wrong here, and this will absolutely be
> required for "complex" HSM (not "simple"), and so therefore we should at
> least think about the arch now. Supposedly we need to keep X bytes at
> the beginning of the file for the unix "file" command, and supposedly
> icon/preview data, and Y bytes at the end of the file, not sure exactly
> why.
> We would still plan on deleting the OST objects in the middle. And
> clearly, a simple beginning/ending byte count is insufficient for the
> final "complex" requirement of enabling partial file reads while doing a
> copyin (where we would at a minimum need a per-object cursor). Anyhow,
> as I write this none of this sounds like something that can't be
> implemented at a later time, so I think we should stick with the
> simplest of the simple options for now.
>
Ok.
Can you just sum up the inplace copy-in mechanism that have been decided
(between Menlo Park version and the other ones)?
--
Aurelien Degremont
CEA
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