linux-ext4 - Re: resilience against power loss

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Date:	Mon, 28 Jul 2014 10:48:05 +0200 (CEST)
From:	Lukáš Czerner <lczerner@...hat.com>
To:	vicentiu.neagoe@...com
cc:	linux-ext4@...r.kernel.org
Subject: Re: resilience against power loss

On Tue, 22 Jul 2014, vicentiu.neagoe@...com wrote:

> Date: Tue, 22 Jul 2014 19:34:10 +0300
> From: vicentiu.neagoe@...com
> To: linux-ext4@...r.kernel.org
> Subject: resilience against power loss
> 
> Hello,
> 
> I'm trying to configure ext4 to prevent data corruption in case of a 
> power loss.
> 
> I test by doing a cold reset right after writing to a file.
> I tried the nodelalloc option, but the file still becomes corrupted 
> with trailing garbage.
> 
> Using ext3, I either get the old version of the file, or the new 
> version, and there is no corruption.
> 
> Does nodelalloc not guarantee data integrity?
> 
> Are there any other options that provide complete resilience against 
> power loss?

Well, that would be fsync. It'll make sure that your data actually reach
disk and that the disk actually write it from the cache to platters.

-Lukas

> 
> thanks
> 
> Vicentiu
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