linux-kernel - Re: ext2 + -osync: not as easy as it seems

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Message-ID: <20090113144233.GC1983@elf.ucw.cz>
Date:	Tue, 13 Jan 2009 15:42:33 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	kernel list <linux-kernel@...r.kernel.org>, jack@...e.cz,
	tytso@....edu
Subject: Re: ext2 + -osync: not as easy as it seems

On Tue 2009-01-13 13:45:03, Alan Cox wrote:
> > Plus it has a nasty behaviour where it reverts to -W1 if disk
> > connection is momentarily lost. (If you unplug/replug SATA disk, linux
> > will happily rediscover and use it, but -W0 was already forgotten at
> > that point, right?)
> 
> If you momentarily lose power your disk state isn't defined anyway. If
> you do that with the SATA code it should treat it the same as a scsi disk
> swap so it'll get a new device and the old fs will go down.

No, that is not what happened :-(. If I replug disk within 10 seconds,
it just behaves as if nothing happened, and continues operating on the
disk. AMD machine... but I don't think that matters.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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