Hi!
> > If It happenned, Sun or someone has port it to linux.
> > We will need some VFS changes to handle 128 bit FS as "Jörn ENGEL"
> > mentionned previous mail in this thread. Is there any plan or action
> > to make VFS handle 128 bit File Sytems like ZFS or future 128 bit
> > File Systems ? Any VFS people reply to this, please?
>
> I believe that on 64 bit platforms, Linux has a 64 bit clean VFS. Python says
> 2**64 is 18446744073709551616, and that's roughly:
> 18,446,744,073,709,551,616 bytes
> 18,446,744,073,709 megs
> 18,446,744,073 gigs
> 18,446,744 terabytes
> 18,446 ... what are those, petabytes?
> 18 Really big lumps of data we won't be using for a while yet.
>
> And that's just 64 bits. Keep in mind it took us around fifty years to burn
> through the _first_ thirty two (which makes sense, since Moore's Law says we
> need 1 more bit every 18 months). We may go through it faster than we went
> through the first 32 bits, but it'll last us a couple decades at least.
>
> Now I'm not saying we won't exhaust 64 bits eventually. Back to chemistry, it
> takes 6.02*10^23 protons to weigh 1 gram, and that's just about 2^79, so it's
> feasible that someday we might be able to store more than 64 bits of data per
> gram, let alone in big room-sized clusters. But it's not going to be for
> years and years, and that's a design problem for Sun.
>
> Sun is proposing it can predict what storage layout will be efficient for as
> yet unheard of quantities of data, with unknown access patterns, at least a
> couple decades from now. It's also proposing that data compression and
> checksumming are the filesystem's job. Hands up anybody who spots
> conflicting trends here already? Who thinks the 128 bit requirement came
> from marketing rather than the engineers?
Actually, if you are storing information in single protons, I'd say
you _need_ checksumming :-).
[I actually agree with Sun here, not trusting disk is good idea. At
least you know kernel panic/oops/etc can't be caused by bit corruption on
the disk.]
Pavel
--
Thanks, Sharp!
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