linux-kernel - Re: writing file to disk: not as easy as it looks

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Message-ID: <20081215200805.GI7083@vanheusden.com>
Date:	Mon, 15 Dec 2008 21:08:05 +0100
From:	Folkert van Heusden <folkert@...heusden.com>
To:	Pavel Machek <pavel@...e.cz>
Cc:	Theodore Tso <tytso@....edu>, Chris Friesen <cfriesen@...tel.com>,
	mikulas@...ax.karlin.mff.cuni.cz, clock@...ey.karlin.mff.cuni.cz,
	kernel list <linux-kernel@...r.kernel.org>, aviro@...hat.com
Subject: Re: writing file to disk: not as easy as it looks

> > There are certainly things you can do.  Put your fileservers's on
> > UPS's.  Use RAID.  Make backups.   Do all three.  :-)
> 
> Okay, so we pretty much	know that ext3 journalling helps in "user hit
> the reset button" case. (And we are pretty sure ext2/ext3 works in
> "clean unmount" case). Otherwise
> 
> *) kernel bug -> journalling does not help.
> 
> *) sudden powerfail -> journalling helps works on SGI high-end
> hardware. It may or may not help on PC-class hardware.
> 
> We already do periodic checks, even on ext3. Maybe we should do fsck
> more often if we see evidence of unclean shutdowns (because we know
> PC hardware is crap...).

What we might need is on-line fsck. E.g. fsck while the fs is still
mounted.

Might be tricky to implement.



Folkert van Heusden

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