Re: File system compression, not at the block layer

[Timothy Miller]

Ben Greear wrote:
> Timothy Miller wrote:
>
> > > Wouldn't this pretty much guarantee worst-case latency scenario for 
> > > reading, since
> > > on average at least one of your 32 disks is going to require a full 
> > > rotation
> > > (and probably a seek) to find it's bit?
> >
> >
> >
> >
> > Only for the first bit of a block.  For large streams of reads, the 
> > fifos will keep things going, except for occasionally as drives drift 
> > in their relative rotation positions which can cause some delays.
>
>
> So how is that better than using a striping raid that stripes at the
> block level or multi-block level?


It's only better for large streaming writes.  The FIFOs I'm talking 
about above would certainly be smaller than typical RAID0 stripes.

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