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Article View: comp.sys.amiga.tech
Article #10598

Re: Faster File Systems

#10598
From: Scott Henry
Date: Thu, 15 Dec 1988 16:56
29 lines
1891 bytes
From article <65@microsoft.UUCP>, by w-colinp@microsoft.UUCP (Colin Plumb):
> I realise it's pretty obvious, but just in case I confused anybody when
> describing how adding data to extent "c" in a track packed like so:
> aaaaabbcccddddeeeeee----------ff would result in its being repacked as
> aaaaabbccc----------fddddeeeeeef, that was a typo.  It should have been
> aaaaabbccc----------ddddeeeeeeff, with f staying where it was.  Sorry.
> 
> P.S. I've received a few replies, but so far it seems as if I'm the best FS
> designer in this newsgroup.  Isn't anyone going to prove I'm not? :-)
> Really, there must be *something* wrong, or the Amiga wouldn't have been
> designed with sectors in the first place.
> -- 
> 	-Colin (uunet!microsof!w-colinp)

The biggest problem that I see with your scheme is that it will only work
with floppy disks (hard disks need not apply). The hard disks that I am aware
of know about sectors (frequently, in the case of SCSI, in the drive itself).
OFS works fine on HD's, but your scheme would need a separate file system
for HD's. I know of (at least) one extent-based HD file system (Silicon
Graphics uses one), but it uses sectors as the level of granularity (this
is all I know about it!, except that it is very fast).

	Scott Henry
	<scotth@sgi.com>
#include <std/disclaimer.h>
--
              Scott Henry <scotth@harlie.sgi.com> {or, also on the Internet:}
                          <skywalker@cup.portal.com>
#include <std_disclaimer.h>
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Message-ID: <23498@sgi.SGI.COM>
Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!lll-tis!ames!sgi!scotth@harlie.SGI.COM
References: <65@microsoft.UUCP>

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!lll-tis!ames!sgi!scotth@harlie.SGI.COM
From: scotth@harlie.SGI.COM (Scott Henry)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Faster File Systems
Message-ID: <23498@sgi.SGI.COM>
Date: 15 Dec 88 16:56:01 GMT
References: <65@microsoft.UUCP>
Sender: daemon@sgi.SGI.COM
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 28