Date: Wed, 12 Feb 2003 20:40:33 +0100 From: Heinrich Rebehn <rebehn@ant.uni-bremen.de> To: Bill Moran <wmoran@potentialtech.com> Cc: freebsd-questions@freebsd.org Subject: Re: fsck takes very long after crash/reset Message-ID: <3E4AA331.5040701@ant.uni-bremen.de> References: <3E4A5B77.5080103@ant.uni-bremen.de> <3E4A863E.2030801@potentialtech.com> <3E4A8EF5.1070308@ant.uni-bremen.de> <3E4A9712.8030609@potentialtech.com>
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Bill Moran wrote: > Heinrich Rebehn wrote: > >> Bill Moran wrote: >> >>> Heinrich Rebehn wrote: >>> >>>> Hi list, >>>> >>>> I operate a FreeBSD server with a 300GB Raid. This morning i had to >>>> hard reset it and when booting, fsck took some 20 minutes. >>> >>> >>> I would expect that from 300G >>> >>>> Most partitions, especially the large ones are mounted with >>>> soft-updates. >>> >>> >>> Good. >>> >>>> Also, some weeks ago, we had missing files after a crash/fsck. >>> >>> >>> Soft-updates will do that if the system crashes in the middle of >>> writes. >> >> >> I have read several times that soft updates ensure that the fs is >> always in a consistent state? > > > As I understand it, it is consistent. It's just consistent with the > way the filesystem was prior to those files being saved. > >> According to murphy's law this happens when the system is needed most >> urgently. fsck times of 20 minutes are not tolerable then. > > > Yeah ... isn't Murphy's law a bitch. > >> This is the point where people talk about journalling fs, and i think >> they're right. > > > Did you search the archives as I suggested? There was a lot of useful > information in some of the past discussions. I have searched freebsd-qustions, but the only info regarding fsck times was that fsck will be made in bg with 5.0 > >> Running fsck in the background might help when 5.0 becomes stable. If >> it really works, ok, otherwise i really think a journalling fs is needed. > > > I think journalling is a good idea anyway. Although it's not the solution > to every problem, journalling has some advantages that softupdates doesn't. > It would be nice if both were available. Are you volunteering, because I > seem to remember the conversation that nobody has had the time to port > something like Reiser to FreeBSD yet. I'm afraid not. I have very little experience with C programming (more FORTRAN, PASCAL, ASSEMBLER, MODULA, ADA). Also i'm not at all familiar w/ the internals of FreeBSD. Time would also be a problem, but not the biggest. Are the filesystem APIs of Linux and FreeBSD so much different? (Probably a silly question :-)) Heinrich To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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