[Triumf-linux-managers] TRIUMF customizations to Scientific Linux distributions

[Rod Nussbaumer]

Andrew Daviel wrote:
> On Thu, 8 Jan 2009, Rod Nussbaumer wrote:
> 
>> Recently, I've been working on cross-development of Linux applications 
>> for an ARM CPU based single board computer. The target SBC uses a SD 
>> flash memory for storage and as a boot media. To prevent wear and tear 
>> from write cycles, the SD flash memory uses a wear-leveling 
>> filesystem, JFS.
> 
> I believe that is JFFS2, not the IBM journalling filesystem "JFS"

That's what I first thought, too. Not so...
> 
> My Nokia tablet mounts the / partition using JFFS2, but the SD cards use 
> SCSI emulation and appear as SCSI disks. On which one can use VFAT 
> (default), ext2/ext3 etc. The emulation layer takes care of the wear 
> levelling.

I've never heard that before. What purpose do specific wear-leveling 
filesystems serve, then? Perhaps the vendor (Technologic Systems 
<http://www.embeddedarm.com>) chose JFS for another good reason.

---    rod.