Re: ext2 vs ext3/4 over eMMC


Marc Ferland
 

On Tue, Jun 26, 2018 at 6:27 AM, Mauro Ziliani <mauro@...> wrote:
Hi all.

I working on imx6dlsabresd clone board equiped with eMMC micron (4GB).

I try some boards with my final application. All boards are the equiped with
same hardware (I hope).


Some board with ext2 kernel tells


EXT2-fs (mmblk2p2): error: ext2_lookup: delete inode referenced: 138049

EXT2-fs (mmblk2p2): error: ext2_lookup: delete inode referenced: 138050

and the file behind the inode gives Input/Output error.


If I format the mmcblk2p2 with ext3 or better with ext4 the lookup error no
longer occurs (as I can see from some test)


Where is the problem?

Is it an hardware problem, that is solved by the journaling of ext3/4=?

Or ext2 has some kind of "misunderstaing" with eMMC?
Typically ext3 or ext4 will help you recover from system crashes and
power failures because they use a journal to keep track of changes not
yet committed to the media . Ext2 does not have that capacity.

It is not a hardware issue.

Nice review of filesystems wrt embedded systems:

https://elinux.org/images/archive/0/02/20150326011053%21Filesystem_Considerations_for_Embedded_Devices.pdf

Marc

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