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Date: Wed, 21 May 2008 15:40:35 -0400 From: Chris Mason <chris.mason@...cle.com> To: Jamie Lokier <jamie@...reable.org> Cc: Theodore Tso <tytso@....edu>, Andrew Morton <akpm@...ux-foundation.org>, Pavel Machek <pavel@...e.cz>, Eric Sandeen <sandeen@...hat.com>, Andi Kleen <andi@...stfloor.org>, linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org Subject: Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes On Wednesday 21 May 2008, Jamie Lokier wrote: > Theodore Tso wrote: > > On Wed, May 21, 2008 at 11:03:24AM -0700, Andrew Morton wrote: > > > afaik there is no need to enable this feature if the machine (actually > > > the disks) are on a UPS, yes? > > > > Yes, as long as you're confident that there won't be a kernel > > bug/regression causing a lockup while the server is under severe > > memory pressure while doing lots of fsync's, file creations, renames, > > etc. And as long as your 100% confident that UPS's will never fail, > > janitors will never accidentally hit the Emergency Power Office > > Can a kernel lockup cause this kind of corruption? No > > Will a system reboot wipe the disk's write cache? > Only if you reboot with the power switch (some test rigs do) > I had imagined only power loss would prevent the disk from > writing it's cache eventually; is that wrong? > -chris -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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