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: <20090905103442.GB1341@ucw.cz>
Date:	Sat, 5 Sep 2009 12:34:42 +0200
From:	Pavel Machek <pavel@....cz>
To:	Theodore Tso <tytso@....edu>, NeilBrown <neilb@...e.de>,
	Ric Wheeler <rwheeler@...hat.com>,
	Rob Landley <rob@...dley.net>, Florian Weimer <fweimer@....de>,
	Goswin von Brederlow <goswin-v-b@....de>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, mtk.manpages@...il.com,
	rdunlap@...otime.net, linux-doc@...r.kernel.org,
	linux-ext4@...r.kernel.org, corbet@....net
Subject: Re: raid is dangerous but that's secret (was Re: [patch] ext2/3:
	document conditions when reliable operation is possible)

Hi!

> > If it only was this simple. We don't have 'check brakes' (aka
> > 'journalling ineffective') warning light. If we had that, I would not
> > have problem.
> 
> But we do; comptently designed (and in the cast of software RAID,
> competently packaged) RAID subsystems send notifications to the system
> administrator when there is a hard drive failure.  Some hardware RAID
> systems will send a page to the system administrator.  A mid-range
> Areca card has a separate ethernet port so it can send e-mail to the
> administrator, even if the OS is hosed for some reason.

Well, my MMC/uSD cards do not have ethernet ports to remind me that
they are unreliable :-(.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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