On Jul 15, 2008, at 7:14 PM, Sean Dague wrote:
> Can you give an example?

I added an iSCSI LUN to be visible to my server, restarted the various  
fiddly bits that cause that LUN to suddenly become visible, causing a / 
dev/sdb to suddenly become /dev/sdc. When I looked at where /dev/sdb1  
was mounted, I was looking at the newly added LUN.

> The links in dev are created by coldplug (or some equiv) during boot,
> and hotplug during run time.  The uuids are coming out of device  
> mapper
> from what I can see.

Maybe, but the problem is that mount is resolving the links to their  
final destination (the /dev/sdXX device) and mounting THAT. The  
"symlink" inode isn't, itself, mountable, so mount traces it down to  
the final block-device inode and mounts that. When the symlink later  
changes to point to some other device, the mounted filesystems don't  
change because the symlink itself isn't what is mounted.

Cheers,
D

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