XO-1 to switch back to JFFS2

Kevin Gordon kgordon420 at gmail.com
Wed Apr 4 17:40:56 EDT 2012

On Wed, Apr 4, 2012 at 5:33 PM, Daniel Drake <dsd at laptop.org> wrote:

> Hi,
> I'm planning on moving the XO-1 back to JFFS2 for 12.1.0 - and likely
> for the future too.
> The reasons being:
> 1. UBIFS is considerably less space-efficient than JFFS2.
> http://www.linux-mtd.infradead.org/faq/ubifs.html#L_jffs2_space
> We needed the disk space already, and we're battling constant growth
> of the Fedora platform. Deployments will also appreciate not losing
> 50mb of space which can be used for content, user data, etc.
> 2. UBIFS is less robust in the face of bad blocks.
> At image creation time, UBIFS allocates a number of blocks that are
> used when other blocks go bad. When that allocation is exceeded (i.e.
> when blocks go bad), UBI goes read-only and there is no simple
> recovery except another reflash.
> JFFS2 is more robust here.
> The ubifs_image module will remain in olpc-os-builder for those who
> wish to try it, but the OLPC configs and images will switch back to
> JFFS2 (which is what we've used in all stable releases til now).
> Comments/objections?

>From my narrow perspective, more space and robustness are more important
than a boost in re-flash speed or boot speed.


+1 from here.

> Thanks,
> Daniel
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