Messages in this thread | | | Subject | Re: atomicity | Date | Mon, 07 Dec 1998 12:10:42 -0300 | From | Horst von Brand <> |
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Mirian Crzig Lennox <mirian@xensei.com> said: > alan@lxorguk.ukuu.org.uk (Alan Cox) writes:
> > ext2fs tries to grab linear chunks of disk and divides the disk into > > cylinder groups to also help to maintain locality. The BSD ffs papers > > [McKusik et al] describe this sort of stuff well.
> I am astonished to hear that ext2fs uses cyl groups.
> I was of the impression that these were an artefact of ffs, and really > not useful anymore. With modern disks, chances are excellent that the > specific 3D geometry the file system sees is an utter fiction, and > that cylinder locality is thus more-or-less a meaningless concept.
It is a meaningless as such, but block locality is important anyway. And "cylinder groups" are an approximation to that. -- Dr. Horst H. von Brand mailto:vonbrand@inf.utfsm.cl Departamento de Informatica Fono: +56 32 654431 Universidad Tecnica Federico Santa Maria +56 32 654239 Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513
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