Ubuntu
udev package

How to Update /dev/disk/by-uuid.

Asked by Ralph Corderoy

Hi, after copying partitions with gparted I had multiple partitions with the same UUID. Having now ensured there's no duplicates, `tune2fs -U random' followed by checking they're all unique with `vol_id', I find that `mount /mnt/point' still mounts the wrong partition, presumably because /etc/fstab specifies a UUID and /dev/disk/by-uuid/$UUID points to a block device that now has a different UUID. How does one get /dev/disk/by-uuid to be up to date? It seems potentially dangerous that it can be out of date, e.g. `mount /mnt/point' followed by removing data will be modifying a different partition than intended.

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Ralph Corderoy
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Ralph Corderoy (ralph-inputplus) said : 		#1

I've found `sudo /etc/init.d/udev restart' does the trick. If this isn't the preferred way, please say so here for others that come Googleling later.

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Michael B. Trausch (mtrausch) said : 		#2

sudo partprobe should do the trick, as well, without having to restart udev.

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Tom Hansen (tomh-uwm) said : 		#3

I just added a new hard drive to a Hardy (8.04) system, and once the drive was partitioned and the ext3 partition created, `sudo partprobe' did not work. Restarting udev did work, just as noted by Mr. Corderoy above, and it did not disrupt the system. It just printed "* Loading additional hardware drivers... ", paused a few seconds, and that was it.