On 06 Dec 1998 23:34:53 -0500, Mirian Crzig Lennox <mirian@xensei.com>
said:
> I am astonished to hear that ext2fs uses cyl groups.
It doesn't exactly. It uses fixed size block groups (8MB each by
default). Doing so is rather important: it helps the filesystem's
fragmentation resistance and keeps performance up by grouping like files
together.
> I was of the impression that these were an artefact of ffs, and really
> not useful anymore.
They are still somewhat useful: having some concept of locality still
makes a performance difference, but ext2fs does not try to optimise for
the disk's precise geometry at all.
--Stephen
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