linux-ext4 - resilience against power loss

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Message-ID: <53CE9282.11182.166B0034@vicentiu.neagoe.ni.com>
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?

thanks

Vicentiu
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