<br><br><div class="gmail_quote">On Wed, Apr 4, 2012 at 5:33 PM, Daniel Drake <span dir="ltr"><<a href="mailto:dsd@laptop.org" target="_blank">dsd@laptop.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
<br>
I'm planning on moving the XO-1 back to JFFS2 for 12.1.0 - and likely<br>
for the future too.<br>
<br>
The reasons being:<br>
<br>
1. UBIFS is considerably less space-efficient than JFFS2.<br>
<br>
<a href="http://www.linux-mtd.infradead.org/faq/ubifs.html#L_jffs2_space" target="_blank">http://www.linux-mtd.infradead.org/faq/ubifs.html#L_jffs2_space</a><br>
<br>
We needed the disk space already, and we're battling constant growth<br>
of the Fedora platform. Deployments will also appreciate not losing<br>
50mb of space which can be used for content, user data, etc.<br>
<br>
<br>
2. UBIFS is less robust in the face of bad blocks.<br>
<br>
At image creation time, UBIFS allocates a number of blocks that are<br>
used when other blocks go bad. When that allocation is exceeded (i.e.<br>
when blocks go bad), UBI goes read-only and there is no simple<br>
recovery except another reflash.<br>
JFFS2 is more robust here.<br>
<br>
<br>
The ubifs_image module will remain in olpc-os-builder for those who<br>
wish to try it, but the OLPC configs and images will switch back to<br>
JFFS2 (which is what we've used in all stable releases til now).<br>
<br>
Comments/objections?<br></blockquote><div><br>From my narrow perspective, more space and robustness are more important than a boost in re-flash speed or boot speed. <br><br>So<br><br>+1 from here.<br></div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
Thanks,<br>
Daniel<br>
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</blockquote></div><br>