<br><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Tiago Marques</b> <span dir="ltr"><<a href="mailto:tiagomnm@gmail.com">tiagomnm@gmail.com</a>></span><br>Date: Fri, Apr 10, 2009 at 5:58 PM<br>
Subject: Re: Hints for ext3 filesystems on flash...<br>To: Martin Langhoff <<a href="mailto:martin.langhoff@gmail.com">martin.langhoff@gmail.com</a>><br><br><br><br><div class="gmail_quote"><div class="im">On Fri, Apr 10, 2009 at 3:55 PM, Martin Langhoff <span dir="ltr"><<a href="mailto:martin.langhoff@gmail.com" target="_blank">martin.langhoff@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Mitch,<br>
<br>
I'm working on getting bootable ext3 images to put on SD cards to use<br>
on the XO, to run the XS distro.</blockquote><div></div></div><div>I've been doing these kinds of tests but using ext2, which has been working fine and should provide more durability. If you still want to go the ext3 route, take a look at this, if you haven't already: <a href="http://thunk.org/tytso/blog/2009/03/01/ssds-journaling-and-noatimerelatime/" target="_blank">http://thunk.org/tytso/blog/2009/03/01/ssds-journaling-and-noatimerelatime/</a></div>
<div></div><div>I have had to have rootdelay=11 in olpc.fth, since my sdcard sometimes takes 10s to get detected instead of 0.5s or less, as usual. I'm using the kernel from OLPC's repositories, snapshot from last saturday.</div>
<div></div><div>Best regards,</div><div> Tiago Marques</div><div class="im"><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
<br>
While I am not expecting the SD card to deal with a heavy write<br>
workload (the recommended strategy is to use an external disk for<br>
/var/lib and /library ), I am still keen on avoiding early SD card<br>
death...<br>
<br>
Do we have any good rule of thumb on any partition alignment +<br>
blocksize that is likely to work well on current SD cards in the<br>
market?<br>
<br>
I've read your notes, and Tytso's blogposts about it; but maybe I'm<br>
not cultured enough to come up with a confident rule of thumb, and<br>
definitely have no idea whether it's possible to write a script to run<br>
on current linuxen that probes an SD card and Does The Right Thing.<br>
<br>
cheers,<br>
<br>
<br>
m<br>
--<br>
<a href="mailto:martin.langhoff@gmail.com" target="_blank">martin.langhoff@gmail.com</a><br>
<a href="mailto:martin@laptop.org" target="_blank">martin@laptop.org</a> -- School Server Architect<br>
- ask interesting questions<br>
- don't get distracted with shiny stuff - working code first<br>
- <a href="http://wiki.laptop.org/go/User:Martinlanghoff" target="_blank">http://wiki.laptop.org/go/User:Martinlanghoff</a><br>
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</blockquote></div></div><br>
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