From owner-freebsd-fs  Mon Aug 27  8:28:48 2001
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Date: Mon, 27 Aug 2001 11:28:35 -0400 (EDT)
From: Robert Watson <rwatson@FreeBSD.ORG>
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To: Rex Luo <rexluo@synology.com>
Cc: freebsd-fs@FreeBSD.ORG
Subject: Re: quick question: softupdate - metadata logging & data logging?
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Take a look at:

http://www.usenix.org/publications/library/proceedings/usenix2000/general/seltzer.html

This paper by Seltzer, et al, compares the semantics and performance of
journalling and soft updates, and was presented at USENIX in 2000.

Robert N M Watson             FreeBSD Core Team, TrustedBSD Project
robert@fledge.watson.org      NAI Labs, Safeport Network Services

On Mon, 27 Aug 2001, Rex Luo wrote:

> Dear,
> 
>   Sorry to not survey thoroughly, and maybe someone can give me some information 
> quickly.
> 
>   Since Filesystem logging can be 3 common forms:(Solaris interinals Core Kernel 
> Architecture Jim Mauro. Richard McDougall)
> 
>   1. Metadata logging -- logs only file system structure changes
>   2. File and metadata loggging -- Logs all changes to the filesystem
>   3. Log-structured file system -- The entire file system is implemented as a log
> 
>   I remember I have seem on mailinglist that FFS with softupdate has similar 
> function as journal filesystem. What kind of journal filesystem it can be?
> or I am totally wrong.
> 
> Thanks
>  
> --
> 
>  -- Rex Luo
> 
> Tel : 886-2-25521814 Ext. 824
> Fax : 886-2-25521824
> e-mail : rexluo@synology.com
> 
> 
> 
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