[Sugar-devel] Good filesystem for USB flash with compression?

[Jonas Smedegaard]

On Sat, Aug 29, 2009 at 09:12:03AM -0400, Luke Faraone wrote:
>On Sat, Aug 29, 2009 at 09:01, Jonas Smedegaard <dr at jones.dk> wrote:
>
>> For the underlying fs I believe the best (i.e. reliable + fast + 
>> non-wearing) is ext4 with journaling disabled.
>
>
>One of the problems we were seeing in the lab when using a overlay for 
>user changes was that if the students unplugged the USB device before 
>it was cleanly unmounted then all their data would be corrupted.
>
>Is ext4 (with journaling disabled) resistant to these sort of problems?

I believe these are the possible approaches, while avoiding wear:

  a) mount syncronously

  b) let fs corrupt, and rely on fsck at next mount

  c) use a true log fs

a) is dead slow so generally avoided. ext{2,3,4} use b) and a benefit of 
ext4 is a quite speedy fsck.

If you are more adventurous then maybe try nilfs2 which is a log fs - 
but it is not very mature so I wouldn't dare trusting my data to it.


  - Jonas

-- 
* Jonas Smedegaard - idealist & Internet-arkitekt
* Tlf.: +45 40843136  Website: http://dr.jones.dk/

  [x] quote me freely  [ ] ask before reusing  [ ] keep private
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 835 bytes
Desc: Digital signature
Url : http://lists.sugarlabs.org/archive/sugar-devel/attachments/20090829/496a0056/attachment.pgp