Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!samsung!munnari.oz.au!ariel!duty
From: duty@ariel.ucs.unimelb.edu.au (Duty Programmer)
Newsgroups: comp.unix.aix
Subject: Re: file fragmentation
Message-ID: <422@ariel.ucs.unimelb.edu.au>
Date: 28 Feb 91 05:59:34 GMT
References: <476@bally.Bally.COM> <3592@d75.UUCP>
Organization: Information Technology Services, University of Melbourne
Lines: 31

In article <3592@d75.UUCP> woan@peyote.cactus.org writes:
>In article <476@bally.Bally.COM> siva@bally.Bally.COM (Siva Chelliah/50000) writes:
>>I have few questions :
>>   1 ) Is there a way to find out the  fragmentation of a file system 
>>       (like the Norton utility for DOS)?
>
>I don't think so... Outside of some old UNIX/386 implementations, I
>don't really remember being able to do this with any UNIX file system
>(UFS perhaps? Certainly not BSD).
>

About two years ago (from memory) a program called 'fsanalyze' was posted
to the net. The program follows the inodes for a file and thereby determines
its fragmentation. I think it was posted to comp.sources.unix, so you
should check your local archives. If you get stuck, I think I have the code
buried on a tape somewhere.

>>   3) How to re-organize the file system ?
>

I presume you mean de-fragmentation. The trick is to sort the (inode) free list
by using 'fsck -s' (you will need to be root), which rebuilds the free list
and thereby makes it ordered, and then copy the fragmented file(s), then
delete the old one(s).

rab
--
Richard Brown                     | E-mail: rab@tauon.ph.unimelb.edu.au
School of Physics                 | Phone : +61 3 344 5081
University of Melbourne           | Fax   : +61 3 347 4783
Parkville Victoria AUSTRALIA 3052 | Telex : AA35185