UUID anomaly

Florian Diesch diesch at spamfence.net
Sat Jul 10 22:16:18 UTC 2010

Nils Kassube <kassube at gmx.net> writes:

> Florian Diesch wrote:
>> Nils Kassube <kassube at gmx.net> writes:
>> > Nowadays I avoid the blkid command and
>> > use
>> > 
>> > ls -l /dev/disk/by-*/
>> > 
>> > instead. I'm quite confident that the output of this command is
>> > real and not from a cache file.
>> I'm not sure if that reflects a UUID change by e.g. tune2fs in real
>> time as that may not fire an udev event (I didn't check this).
> Good point. I just tried what happens if I create / change / remove a 
> disk label of one partition and afterwards check the links in 
> /dev/disk/by-label/. I used the commands
> sudo tune2fs -L NEWLABEL /dev/sda1;ls -l /dev/disk/by-label/
> where I changed NEWLABEL each time. Sometimes the new label was shown 
> immediately but usually it was still the old label. However if I 
> inserted a
> sleep 1
> between the commands, it always showed the new label. So your assumption 
> was right, it is not updated in real time. But in real life the update 
> seems to be fast enough.

Thanks for checking this :-)


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