Re: atomicity

Alan Cox (
Mon, 7 Dec 1998 13:01:41 +0000 (GMT)

> I am astonished to hear that ext2fs uses cyl groups.

They still make sense

> 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.

If it was meaningless then things like sorting write queues would also
be pointless. Its certainly true that the 3D information is less than
useful nowdays. Its not however true that relative distance (in time)
between sectors is not strongly proportional to the difference in sector
numbers, or that reading sectors is order of sequentional logical number
isnt a good thing

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