linux-ext4 - Re: raid is dangerous but that's secret (was Re: [patch] ext2/3: document conditions when reliable operation is possible)

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Message-ID: <4A9C5A7D.8000302@cox.net>
Date:	Mon, 31 Aug 2009 18:19:25 -0500
From:	Ron Johnson <ron.l.johnson@....net>
To:	Jesse Brandeburg <jesse.brandeburg@...il.com>
CC:	Theodore Tso <tytso@....edu>, Ric Wheeler <rwheeler@...hat.com>,
	Linux-Ext4 <linux-ext4@...r.kernel.org>
Subject: Re: raid is dangerous but that's secret (was Re: [patch] ext2/3:
 	document conditions when reliable operation is possible)

On 2009-08-31 17:26, Jesse Brandeburg wrote:
> On Mon, Aug 31, 2009 at 11:07 AM, martin f krafft<madduck@...ian.org> wrote:
>> also sprach Jesse Brandeburg <jesse.brandeburg@...il.com> [2009.08.31.1949 +0200]:
>>> In the case of a degraded array, could the kernel be more
>>> proactive (or maybe even mdadm) and have the filesystem remount
>>> itself withOUT journalling enabled?  This seems on the surface to
>>> be possible, but I don't know the internal particulars that might
>>> prevent/allow it.
>> Why would I want to disable the filesystem journal in that case?
> 
> I misspoke w.r.t journalling, the idea I was trying to get across was
> to remount with -o sync while running on a degraded array, but given
> some of the other comments in this thread I'm not even sure that would
> help.  the idea was to make writes as safe as possible (at the cost of
> speed) when running on a degraded array, and to have the transition be
> as hands-free as possible, just have the kernel (or mdadm) by default
> remount.

Much better, I'd think, to "just" have it scream out DANGER!! WILL 
ROBINSON!! DANGER!! to syslog and to an email hook.

-- 
Brawndo's got what plants crave.  It's got electrolytes!
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