SYMLINK assignment in udev rules file

SYMLINK assignment in udev rules file

[jacky.fong]

Hi,
I need some help with udev rule writing. I am having difficulty  
understanding the description for the SYMLINK assignment key  
(http://manpages.ubuntu.com/manpages/oneiric/man7/udev.7.html).  The  
manpage
says,
   "In case multiple devices claim the same name, the link always  
points to the device with the highest link_priority."

How can you have multiple devices that claim the same name? It is said  
in the description section of the manpage that "the kernel usually  
just assigns unpredictable device names based on the order of  
discovery." E.g. sda, sdb,...

The only situation I could think of where multiple devices claiming  
the same name is when the user decides to do NAME="sda", which is not  
recommended, as noted in the manpage.

Btw, none of the device file nodes are created in the filesystem  
(/dev) at this
point right?  Since filenames must be unique under a directory, I just  
don't see the case where "multiple devices claim the same name".

Thanks,
Jacky