linux-kernel - Re: document ext3 requirements

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Message-ID: <20090105114329.7973057b@lxorguk.ukuu.org.uk>
Date:	Mon, 5 Jan 2009 11:43:29 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Theodore Tso <tytso@....edu>
Cc:	"Alexander E. Patrakov" <patrakov@...il.com>,
	Pavel Machek <pavel@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, mtk.manpages@...il.com,
	rdunlap@...otime.net, linux-doc@...r.kernel.org
Subject: Re: document ext3 requirements

> If dm supported barriers, this wouldn't be an issue.  Personally, I

"If the dm people applied the patches to support barriers" I believe is
the correct description - Andi ? 

dm and md want fixing and even in the md case it isn't hard to do right.

> > or disabling write cache (but, as Alan Cox said, this  
> > shortens the lifespan of the disk).
> 
> Huh?  I've never heard an assertion that disabling the write cache (I
> assume you mean using write-through caching as opposed to write-back
> caching), shortens the lifespan of disk drives.  Aggressive battery

Thats what I was told by a disk vendor - simply because the drive makes a
lot more mechanical movements and writes.

> your noticing it, you can avoid running fsck at boot time.  It's
> really more about shorting the boot time after a crash more than
> anything else.

That depends enormously on your environment. In a secure environment full
data journalling is practically essential to avoid the tiny risk of bits
of important data turning up in another users file.

Alan
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