Re: [ossig] FOSSCON: to who may concern, defrag tool

[Tze-Meng Tan <tmtan@opensos.net>]

More on fragmentation

DEFRAGMENTATION IN UNIX V.4 FILE SYSTEMS:
		     NECESSITIES AND TOOLS

			Robert A. Heath
		System Software Development Center
			MCPD--Columbia

The need to defragment file systems on NCR Sys V.4 and the tools
for doing so depend on the file system type.  There are 3 main types:

s5 File System Type
The s5 file system is susceptible to fragmentation.
Fragmentation reduces file system performance.
There's no tool released to measure s5 file system fragmentation.
If you need to defragment your s5 file system, there is a standard 
utility,
dcopy(1M)  which defragments while moving your file system to a new 
slice.
The good news: you probably aren't using the s5 file system.

ufs File System Type
Ufs is the standard file system of NCR's UNIX V.4-based operating 
system,
MP_RAS.  The ufs file system is designed to minimize performance
losses due to fragmentation.  There's no standard tool to measure ufs
fragmentation; there's no tool to defragment a ufs file system.
If you must defragment a ufs file system, the procedure is a) to back 
up the
file system using cpio(1), b) re-make the ufs file system, and c) 
restore the
data using cpio.  (OK. That's not very pretty, but then again, you're
not supposed to need to do this.)

vxfs File System Type
vxfs (a.k.a. the Journaling File System) is an optional file system
which is available when either the "vxfs" or the "vxfs.lite" package
is installed.
The vxfs file system is susceptible to fragmentation. However, it 
installs
a utility fsadm, documented as fsadm_vxfs(1M), which can both measure 
and
reduce file system fragmentation.

For more information, see "Elminating File System Fragmentation" in
the publication _Administrator Guide: Command Line Interface_, 
publication
D1-2266.

On Thursday, August 28, 2003, at 11:04 AM, kean wrote:

> someone was asking about the defragementer tools for
> linux. if you didn't manage to note down, here is the
> detail:
>
> defrag
> http://packages.debian.org/stable/admin/defrag.html
>
> it's seem like it's only support ext2, minix and xiafs
> filesystem. anyone know other defragementer tool to
> support the latest journaling filesystem ext3,
> reiserFS, JFS and XFS?
>
> kean
>
>
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