linux-kernel - Re: New filesystem for Linux

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Date:	Sun, 05 Nov 2006 21:42:15 -0500
From:	Phillip Susi <psusi@....rr.com>
To:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
CC:	Grzegorz Kulewski <kangur@...com.net>, linux-kernel@...r.kernel.org
Subject: Re: New filesystem for Linux

Mikulas Patocka wrote:
> There was discussion about it here some times ago, and I think the 
> result was that the IDE bus is reset prior to capacitors discharge and 
> total loss of power and disk has enough time to finish a sector --- but 
> if you have crap power supply (doesn't signal power loss), crap 
> motherboard (doesn't reset bus) or crap disk (doesn't respond to reset), 
> it can fail.
> 
> BTW. reiserfs and xfs depend on this feature too. ext3 is the only one 
> that doesn't.
> 
> Mikulas

Yes, if your disk can not atomically commit a single sector, then it is 
broken.  And ALL filesystems rely on this behavior because they all 
expect NOT to have hardware IO read failures of important metadata after 
a power failure ( due to the sector ECC failing ).


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