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Date:	Wed, 14 Nov 2012 11:41:59 +0100
From:	"Ohlsson, Fredrik (GE Healthcare, consultant)" 
	<Fredrik.Ohlsson@...com>
To:	<linux-ext4@...r.kernel.org>
Subject: ext4 settings in an embedded system

Hi,
I would like to have advice regarding features and options.
I am working with an embedded system equipped with an IDE Flash Disk and the ext4 filesystem. I have identified 3 problems that I would like to solve in our product. The power is abruptly turned off from time to time, this has sometimes resulted in broken Superblock (inode8) and empty files with size 0 bytes. It also happens that file changes is not committed to disk even if minutes pass before a power loss. This is very undesirable and expensive in our case, we are searching for a solution or a workaround to the problems.
List with my problems I like to solve:
1. Broken Superblock (inode8).
2. Empty files, size 0.
3. Very long auto commit times, several minutes with default settings.


Is ext4 a bad choice for an embedded system with I 1Gb IDE Flash Disk and Debian 2.6.32-5-686?  Should we change filesystem?

I am planning to set the mount flags: barrier=1, commit=1 and data=journal, is this the way to go with an embedded system and ext4? 

Is there more ext4 options/settings I can use to get an embedded system reliable when a power loss occurs?

Best Regards

Fredrik Ohlsson
Software Engineer



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