Partitions except for root don't mount as /dev/disk/by-label

maciejjo · 2011-05-05 11:01:26

My /home and /var partitions mount as /dev/sdaxx. / works as I want (marked with arrows):

maciejjo@prysznic ~ $ mount
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
sys on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=10240k,nr_inodes=257049,mode=755)
run on /run type tmpfs (rw,nosuid,nodev,noexec,relatime,size=10240k)
/dev/disk/by-label/root on / type ext4 (rw,noatime,barrier=1,data=ordered)<----------------------
devpts on /dev/pts type devpts (rw)
none on /dev/shm type tmpfs (rw,nosuid,nodev)
/dev/sda6 on /var type reiserfs (rw,noatime)<----------------------------------------------------
/dev/sda8 on /home type ext4 (rw,noatime,user_xattr)<--------------------------------------------
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,mode=1777)
tmpfs on /var/lock type tmpfs (rw,noexec,nosuid,nodev,mode=1777,size=10m)
tmpfs on /var/run type tmpfs (rw,noexec,nosuid,nodev,mode=0755,size=10m)
/home/maciejjo/music on /var/lib/mpd/music type none (rw,bind)

My /etc/fstab:

maciejjo@prysznic ~ $ cat /etc/fstab 
# 
# /etc/fstab: static file system information
#
#<file system>          <dir>               <type>      <options>                                       <dump>  <pass>
devpts                  /dev/pts            devpts      defaults                                        0       0
none                    /dev/shm            tmpfs       nodev,nosuid                                    0       0
/dev/disk/by-label/swap swap                swap        defaults                                        0       0
/dev/disk/by-label/root /                   ext4        defaults,noatime                                0       1
/dev/disk/by-label/var  /var                reiserfs    defaults,noatime                                0       2
/dev/disk/by-label/home /home               ext4        defaults,noatime,user_xattr                     0       2
tmpfs                   /tmp                tmpfs       defaults,nodev,nosuid,mode=1777                 0       0
tmpfs                   /var/lock           tmpfs       defaults,nodev,nosuid,noexec,mode=1777,size=10m 0       0
tmpfs                   /var/run            tmpfs       defaults,nodev,nosuid,noexec,mode=0755,size=10m 0       0
/home/maciejjo/music    /var/lib/mpd/music  none        bind                                            0       0

Why don't they mount properly? I followed Persistent block device naming article.

nybegynner · 2011-05-05 12:56:30

Don't know exactly what the problem is, but instead of mounting devices like this in fstab

/dev/disk-by-label/label    /mountpoint

try using this instead

LABEL=somelabel    /mountpoint

maciejjo · 2011-05-05 15:07:47

I'm not sure if this is a problem, but i thought that using labels in fstab is to prevent mounting under /dev/sdaxx, and mount like my root partition. I just want to take adventage of it, in case of booting with two discs. And when I use LABEL it looks the same. Maybe it is supposed to.

ewaller · 2011-05-05 16:20:37

As a sanity check, would you please post the output of ls /dev/disk/by-id ??
Thanks

edit:fixed Typo

Last edited by ewaller (2011-05-05 16:21:19)

maciejjo · 2011-05-05 17:46:28

here you go:

maciejjo@prysznic ~ $ ls /dev/disk/by-id
ata-TSSTcorp_CDDVDW_SH-S223B_0S23456789BLMNOP    ata-WDC_WD3200AAKS-00L9A0_WD-WCAV25333712-part7  scsi-SATA_WDC_WD3200AAKS-_WD-WCAV25333712-part6  wwn-0x50014ee101f5afa8-part5
ata-WDC_WD3200AAKS-00L9A0_WD-WCAV25333712        ata-WDC_WD3200AAKS-00L9A0_WD-WCAV25333712-part8  scsi-SATA_WDC_WD3200AAKS-_WD-WCAV25333712-part7  wwn-0x50014ee101f5afa8-part6
ata-WDC_WD3200AAKS-00L9A0_WD-WCAV25333712-part1  scsi-SATA_WDC_WD3200AAKS-_WD-WCAV25333712        scsi-SATA_WDC_WD3200AAKS-_WD-WCAV25333712-part8  wwn-0x50014ee101f5afa8-part7
ata-WDC_WD3200AAKS-00L9A0_WD-WCAV25333712-part2  scsi-SATA_WDC_WD3200AAKS-_WD-WCAV25333712-part1  wwn-0x50014ee101f5afa8                           wwn-0x50014ee101f5afa8-part8
ata-WDC_WD3200AAKS-00L9A0_WD-WCAV25333712-part3  scsi-SATA_WDC_WD3200AAKS-_WD-WCAV25333712-part2  wwn-0x50014ee101f5afa8-part1
ata-WDC_WD3200AAKS-00L9A0_WD-WCAV25333712-part5  scsi-SATA_WDC_WD3200AAKS-_WD-WCAV25333712-part3  wwn-0x50014ee101f5afa8-part2
ata-WDC_WD3200AAKS-00L9A0_WD-WCAV25333712-part6  scsi-SATA_WDC_WD3200AAKS-_WD-WCAV25333712-part5  wwn-0x50014ee101f5afa8-part3

ewaller · 2011-05-05 18:00:29

More coffee for me.

I really meant to ask for /dev/disk/by-label

I should be careful for what I ask -- I might get it

maciejjo · 2011-05-05 18:07:08

That confused me, but I thought: He knows what he is doing. Here's my /dev/disk/by-label:

maciejjo@prysznic ~ $ ls /dev/disk/by-label/
home  root  swap  System\x20Reserved  var

Last edited by maciejjo (2011-05-05 18:07:28)

ewaller · 2011-05-05 18:31:56

That all looks reasonable. If you have /etc/fstab set up using drive labels, can you:

boot
log in as root (since root's home is on / )
mount /home using just mount /home ??

Also, does swap get started correctly?

milomouse · 2011-05-05 19:32:46

I have the same situation though I don't think it's a problem, especially if you know where the labels is supposed to be mounted in the first place and it's present after boot. Perhaps it's because root is mounted before certain udev events are triggered, and isn't translated to a device yet (for kernel >=2.6 anyway). Neither /proc/mounts nor df (...) will show labels or UUIDs after udev associates, AFAIK. All my volumes are labeled and mounted by label and root always shows up as /dev/disk/by-label/LABEL and the rest are translated to /dev/sd[a-z]. I could be wrong but I think it's normal behavior. I have tried other linux distros which are mounted by label and they show the same thing. You can test it by using a LiveCD and mounting your root device by label.. it should show up translated to /dev/[hs]d[a-z], if I'm not mistaken.. Just some ideas, anyway.
Edit: Also, my external devices are always translated to /dev/sd[a-z], as well, when mounted by label.

Last edited by milomouse (2011-05-05 19:36:58)

nybegynner · 2011-05-07 09:20:08

Try examine and post here the output of

cfdisk

Last edited by nybegynner (2011-05-07 09:22:41)

maciejjo · 2011-05-07 09:42:20

         Name                         Flags                      Part Type                FS Type                                [Label]                            Size (MB)
 ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                  Primary                 Free Space                                                                     1.05                 *
         sda1                         Boot                        Primary                 ntfs                                   [System Reserved]                     104.86                 *
         sda2                                                     Primary                 ntfs                                                                       31352.43                 *
         sda5                                                     Logical                 ext4                                   [root]                              15438.86                 *
         sda6                                                     Logical                 reiserfs                               [var]                               10256.93                 *
         sda7                                                     Logical                 swap                                   [swap]                               1019.94                 *
         sda8                                                     Logical                 ext4                                   [home]                             261896.29                 *
                                                                  Pri/Log                 Free Space                                                                     2.62                 *

I don't see anything unusual here, I think that milomouse is right, that what I get is normal behaviour. If anyone doesn't understand my problem: I just thought that when I use /dev/disk/by-label method in /etc/fstab, my partitions should be mounted as /dev/disk/by-label and not as /dev/sdxx. My system works fine, I thought that i missed something in configuration, but it looks like what I get is what I should get.

Arch Linux

#1 2011-05-05 11:01:26

Partitions except for root don't mount as /dev/disk/by-label

#2 2011-05-05 12:56:30

Re: Partitions except for root don't mount as /dev/disk/by-label

#3 2011-05-05 15:07:47

Re: Partitions except for root don't mount as /dev/disk/by-label

#4 2011-05-05 16:20:37

Re: Partitions except for root don't mount as /dev/disk/by-label

#5 2011-05-05 17:46:28

Re: Partitions except for root don't mount as /dev/disk/by-label

#6 2011-05-05 18:00:29

Re: Partitions except for root don't mount as /dev/disk/by-label

#7 2011-05-05 18:07:08

Re: Partitions except for root don't mount as /dev/disk/by-label

#8 2011-05-05 18:31:56

Re: Partitions except for root don't mount as /dev/disk/by-label

#9 2011-05-05 19:32:46

Re: Partitions except for root don't mount as /dev/disk/by-label

#10 2011-05-07 09:20:08

Re: Partitions except for root don't mount as /dev/disk/by-label

#11 2011-05-07 09:42:20

Re: Partitions except for root don't mount as /dev/disk/by-label

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