From owner-freebsd-hackers Fri Feb 9 15:24:37 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from earth.backplane.com (earth-nat-cw.backplane.com [208.161.114.67]) by hub.freebsd.org (Postfix) with ESMTP id 4523437B698 for ; Fri, 9 Feb 2001 15:24:17 -0800 (PST) Received: (from dillon@localhost) by earth.backplane.com (8.11.1/8.9.3) id f19NODX15558; Fri, 9 Feb 2001 15:24:13 -0800 (PST) (envelope-from dillon) Date: Fri, 9 Feb 2001 15:24:13 -0800 (PST) From: Matt Dillon Message-Id: <200102092324.f19NODX15558@earth.backplane.com> To: Andre Oppermann Cc: Rik van Riel , Mike Silbersack , Poul-Henning Kamp , Charles Randall , Dan Phoenix , Alfred Perlstein , Jos Backus , freebsd-hackers@FreeBSD.ORG Subject: Re: soft updates and qmail (RE: qmail IO problems) References: <3A805035.C71AAD5E@monzoon.net> <200102061943.f16Jhp365113@earth.backplane.com> <3A805938.96ED890D@monzoon.net> <200102062018.f16KIdx66146@earth.backplane.com> <200102090602.f1962cM19819@earth.backplane.com> <3A84659C.F841F58E@monzoon.net> Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG :I do. Is it safe there as well (from your point of view)? : :-- :Andre Yes. In general softupdates will make the entire filesystem safer. The commit sequencing doesn't match what qmail expects, but there are so many fsyncs going on that the absolute worse that can happen in a crash is a just-deleted queue file showing up in the queue directory after crash recovery. And, really, qmail shouldn't be making assumptions about system calls committing operations to disk synchronously. Very few modern filesystems actually do that... FFS (without softupdates) is one of the last ones. -Matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message