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Hello,
my hd is mounted via UUID (seems to be standard with arch installation), its just that for one of the partitions the UUID is nozt changed into a device-name like /dev/sda3.
So if I do a df the output is:
udev 10240 216 10024 3% /dev
/dev/disk/by-uuid/8d2a1a14-7050-41d3-b7ca-f5460ab6770e
10323128 4663572 5135272 48% /
shm 1019152 0 1019152 0% /dev/shm
/dev/sda4 142416680 6951072 128231260 6% /home
/dev/sda1 64240 14662 46252 25% /bootsame is true for /etc/mtab and /proc/mounts. At which time is the name-switching between UUID and normal device names made?
Thanks a lot in advance!
Last edited by miro279 (2010-10-07 18:17:38)
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It's a known "bug".
A similar one was closed: https://bugs.archlinux.org/task/19785
Last edited by karol (2010-10-07 11:48:42)
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for me in every output I can only find the UUID for /dev/sda3:
findmnt -rnu -o SOURCE,TARGET,FSTYPE,OPTIONS
proc /proc proc rw,relatime
sys /sys sysfs rw,relatime
udev /dev devtmpfs rw,nosuid,relatime,size=10240k,nr_inodes=218530,mode=755
/dev/disk/by-uuid/8d2a1a14-7050-41d3-b7ca-f5460ab6770e / ext4 rw,relatime,barrier=1,data=ordered
devpts /dev/pts devpts rw,relatime,mode=600,ptmxmode=000
shm /dev/shm tmpfs rw,nosuid,nodev,relatime
/dev/sda4 /home ext4 rw,relatime,barrier=1,data=ordered
/dev/sda1 /boot ext2 rw,relatime,errors=continueand also
cat /proc/self/mountinfo
12 15 0:3 / /proc rw,relatime - proc proc rw
13 15 0:12 / /sys rw,relatime - sysfs sys rw
14 15 0:5 / /dev rw,nosuid,relatime - devtmpfs udev rw,size=10240k,nr_inodes=218530,mode=755
15 1 8:3 / / rw,relatime - ext4 /dev/disk/by-uuid/8d2a1a14-7050-41d3-b7ca-f5460ab6770e rw,barrier=1,data=ordered
18 14 0:10 / /dev/pts rw,relatime - devpts devpts rw,mode=600,ptmxmode=000
19 14 0:15 / /dev/shm rw,nosuid,nodev,relatime - tmpfs shm rw
20 15 8:4 / /home rw,relatime - ext4 /dev/sda4 rw,barrier=1,data=ordered
21 15 8:1 / /boot rw,relatime - ext2 /dev/sda1 rw,errors=continueWhere is the source for all of this?
Also, blkid does know the right translation:
blkid
/dev/sda1: UUID="dd98976f-fc27-4a32-8db7-d92fa36317e4" TYPE="ext2"
/dev/sda2: UUID="28955678-413a-4fd5-a459-2b129667c94e" TYPE="swap"
/dev/sda3: UUID="8d2a1a14-7050-41d3-b7ca-f5460ab6770e" TYPE="ext4"
/dev/sda4: UUID="b3d9152c-61f2-4fb2-89d3-337ee1764b04" TYPE="ext4"for some reason its just not passed to mtab for one of these devices.. strange problem
Last edited by miro279 (2010-10-07 12:48:15)
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Have you read 'man findmnt'?
findmnt --fstab --evaluateYou can patch your initscripts or make some aliases if you prefer the values to be shown in another way: http://projects.archlinux.org/initscrip … 84a8d1536e
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the problem is that both outputs only show the uuid:
/bin/findmnt -rnu -o SOURCE,TARGET,FSTYPE,OPTIONS
proc /proc proc rw,relatime
sys /sys sysfs rw,relatime
udev /dev devtmpfs rw,nosuid,relatime,size=10240k,nr_inodes=218530,mode=755
/dev/disk/by-uuid/8d2a1a14-7050-41d3-b7ca-f5460ab6770e / ext4 rw,relatime,barrier=1,data=ordered
devpts /dev/pts devpts rw,relatime,mode=600,ptmxmode=000
shm /dev/shm tmpfs rw,nosuid,nodev,relatime
/dev/sda4 /home ext4 rw,relatime,barrier=1,data=ordered
/dev/sda1 /boot ext2 rw,relatime,errors=continueand
cat /proc/mounts
rootfs / rootfs rw 0 0
proc /proc proc rw,relatime 0 0
sys /sys sysfs rw,relatime 0 0
udev /dev devtmpfs rw,nosuid,relatime,size=10240k,nr_inodes=218530,mode=755 0 0
/dev/disk/by-uuid/8d2a1a14-7050-41d3-b7ca-f5460ab6770e / ext4 rw,relatime,barrier=1,data=ordered 0 0
devpts /dev/pts devpts rw,relatime,mode=600,ptmxmode=000 0 0
shm /dev/shm tmpfs rw,nosuid,nodev,relatime 0 0
/dev/sda4 /home ext4 rw,relatime,barrier=1,data=ordered 0 0
/dev/sda1 /boot ext2 rw,relatime,errors=continue 0 0Where do they get their names form?
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'/bin/findmnt --fstab' will take them from fstab. The default source is /proc/self/mountinfo.
It's in the man page.
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but thats cosmetics..
the general problem is, that there are different devices for one where it seems that the /dev/disk/by-uuid/* devices seeems to be links from the /dev/sda* devices:
ls -l /dev/sda*
brw-rw---- 1 root disk 8, 0 7. Okt 14:57 /dev/sda
brw-rw---- 1 root disk 8, 1 7. Okt 14:57 /dev/sda1
brw-rw---- 1 root disk 8, 2 7. Okt 14:57 /dev/sda2
brw-rw---- 1 root disk 8, 3 7. Okt 14:57 /dev/sda3
brw-rw---- 1 root disk 8, 4 7. Okt 14:57 /dev/sda4and
ls -l /dev/disk/by-uuid/*
lrwxrwxrwx 1 root 0 10 7. Okt 14:57 /dev/disk/by-uuid/28955678-413a-4fd5-a459-2b129667c94e -> ../../sda2
lrwxrwxrwx 1 root 0 10 7. Okt 14:57 /dev/disk/by-uuid/8d2a1a14-7050-41d3-b7ca-f5460ab6770e -> ../../sda3
lrwxrwxrwx 1 root 0 10 7. Okt 14:57 /dev/disk/by-uuid/b3d9152c-61f2-4fb2-89d3-337ee1764b04 -> ../../sda4
lrwxrwxrwx 1 root 0 10 7. Okt 14:57 /dev/disk/by-uuid/dd98976f-fc27-4a32-8db7-d92fa36317e4 -> ../../sda1in the one case of /dev/sda3 now the whole system thinks that it is a good idea to use the link as global reference, for the others it taks the original devices. Why?
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Only the / partition is referenced by uuid.
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so the bug is, that for the / partition the link is considert reference?
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a solution for this problem is to add the Option -c to findmnt in /etc/rc.sysinit. the part that generates /etc/mtab looks like this afte that:
f [ -x /bin/findmnt -a -e /proc/self/mountinfo ]; then
/bin/findmnt -rnuc -o SOURCE,TARGET,FSTYPE,OPTIONS >| /etc/mtab
else
cat /proc/mounts >| /etc/mtabI still don't understand why the / partition should be labeled different from the begining on, but Im not a expert in that of course, so there might be good reasons. How just likes to have a proper looking df command can live with that additional option I guess.
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