From owner-freebsd-hackers  Thu Feb  8 22: 2:59 2001
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Date: Thu, 8 Feb 2001 22:02:38 -0800 (PST)
From: Matt Dillon <dillon@earth.backplane.com>
Message-Id: <200102090602.f1962cM19819@earth.backplane.com>
To: Andre Oppermann <oppermann@monzoon.net>,
	Rik van Riel <riel@conectiva.com.br>,
	Mike Silbersack <silby@silby.com>,
	Poul-Henning Kamp <phk@critter.freebsd.dk>,
	Charles Randall <crandall@matchlogic.com>,
	Dan Phoenix <dphoenix@bravenet.com>,
	Alfred Perlstein <bright@wintelcom.net>,
	Jos Backus <josb@cncdsl.com>, freebsd-hackers@FreeBSD.ORG
Subject: Re: soft updates and qmail (RE: qmail IO problems)
References: <Pine.LNX.4.21.0102061555550.1535-100000@duckman.distro.conectiva> <3A805035.C71AAD5E@monzoon.net> <200102061943.f16Jhp365113@earth.backplane.com> <3A805938.96ED890D@monzoon.net> <200102062018.f16KIdx66146@earth.backplane.com>
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    Well, after a long conversation with Mr Bernstein and Kirk it turns out
    that all my blathering about a normal FFS mount being easily corruptable
    due to a crash occuring during heavy disk I/O (e.g. from qmail) is so
    much smoke.

    The fsync()/rename() combination that QMail does should be sufficient to
    guarentee (baring a bug in kernel) that a crash will not result in any
    lost mail queue files when using a normal FFS mount (without softupdates).

    However, I still recommend using softupdates.

						-Matt




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