Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

From: Jamie Lokier
Date: Wed May 21 2008 - 15:38:30 EST

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?

Will a system reboot wipe the disk's write cache?

I had imagined only power loss would prevent the disk from
writing it's cache eventually; is that wrong?

-- Jamie

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