> Yes you can.
> Or you can "mount -o remount,noxino /usr" before "umount -l /usr".
> The noxino option closes xino files.

FYI,
(from the aufs1 manual)

           When your aufs is the root directory of your system, and your system 
tells you some of  
           the filesystem were not unmounted cleanly, try these procedure when 
you shutdown your   
           system.                                                              
                   
                                                                                
                   
           # mount -no remount,ro /                                             
                   
           # for i in $writable_branches                                        
                   
           # do mount -no remount,ro $i                                         
                   
           # done                                                               
                   
                                                                                
                   
           If your xino file is on a hard drive, you also need to specify 
'noxino' option or 'xino=
           /your/tmpfs/xino' at remounting root directory.                      
                   


J. R. Okajima

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