Re: what is our answer to ZFS?

From: Rob Landley
Date: Tue Nov 22 2005 - 01:41:00 EST

On Monday 21 November 2005 18:45, Pavel Machek wrote:
> Hi!
> > 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 :-).

You need error correcting codes at the media level. A molecular storage
system like this would probably look a lot more like flash or dram than it
would magnetic media. (For one thing, I/O bandwidth and seek times become a
serious bottleneck with high density single point of access systems.)

> [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.]

But who said the filesystem was the right level to do this at?

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