linux-kernel - Re: document ext3 requirements

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Message-ID: <4960FE39.2060307@msgid.tls.msk.ru>
Date:	Sun, 04 Jan 2009 21:21:45 +0300
From:	Michael Tokarev <mjt@....msk.ru>
To:	"Alexander E. Patrakov" <patrakov@...il.com>
CC:	Pavel Machek <pavel@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, tytso@....edu,
	mtk.manpages@...il.com, rdunlap@...otime.net,
	linux-doc@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: document ext3 requirements

Alexander E. Patrakov wrote:
[]
> Ext3 means either hardware that supports barriers (not sure how to
> check, and anyway I have to use encryption on the work laptop due to the
> corporate policy) or disabling write cache (but, as Alan Cox said, this
> shortens the lifespan of the disk). Does this requirement apply to other
> journaling filesystems? Do I need journaling at all, given that I have
> an UPS on my desktop and a battery in the laptop?

There's another possibility too, somewhat more risky.  Namely, run with
write cache ON by default, and switch it off when running off battery
(either UPS or notebook).  Should save both worlds, PROVIDED the battery
actually/UPS works :)

/mjt


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