Mount fails without error

phunni · 2015-01-05 16:11:41

When I try and mount an external, USB based, device the mount command appears to succeed:

mount -v /media/ds
mount: /dev/sdc1 mounted on /media/ds.

The mounted directory, however, is empty - even though the device is not. When I try to umount the device I get the following:

umount /media/ds
umount: /media/ds: not mounted

Nothing relevant was added to /etc/mtab. Exactly the same happens whether I run the commands as root or a normal user. It's also exactly the same when I try and mount referencing the device under /dev instead of using the fstab entry.

I've also had similar results when trying to mount things via mtp.

dice · 2015-01-05 17:33:02

What is in your fstab? And what is the output og

lsblk -f

when the USB device is connected?
What kind of device is that?

phunni · 2015-01-05 19:19:19

fstab:

# <file system>	<dir>	<type>	<options>	<dump>	<pass>
# UUID=863696d9-cb5c-49d4-a2ea-50b5188c0573 LABEL=root
/dev/md0p2          	/         	ext4      	rw,relatime,stripe=128,data=ordered	0 1

# UUID=e8c4f6c1-0235-4bbc-883b-aedd2a0599fe LABEL=boot
/dev/md0p1          	/boot     	ext2      	rw,relatime,stripe=128	0 2

# UUID=1e66419e-fdae-4b9e-9fe1-2d240781e947 LABEL=home
/dev/md0p3          	/home     	ext4      	rw,relatime,stripe=128,data=ordered	0 2

#swap
/swapfile none swap defaults 0 0


192.168.0.1:/opt/backup/ /opt/backup nfs users,noauto,nolock,x-systemd.automount 0 0
192.168.0.1:/opt/video/ /opt/video nfs users,noauto,nolock,x-systemd.automount 0 0
192.168.0.1:/opt/music/ /opt/music nfs users,noauto,nolock,x-systemd.automount 0 0
192.168.0.1:/opt/photos/ /opt/photos nfs users,noauto,nolock,x-systemd.automount 0 0
192.168.0.1:/opt/shared/ /opt/shared nfs users,noauto,nolock,x-systemd.automount 0 0
192.168.0.1:/opt/ebooks/ /home/paul/documents/ebooks nfs noauto,users,nolock,x-systemd.automount 0 0


/dev/disk/by-uuid/20A0-683F /media/cowon vfat users,noauto 0 0
/dev/disk/by-uuid/A036-C3DF /media/cowonsd vfat users,noauto 0 0
/dev/disk/by-uuid/DBE6-DDB7 /media/ds vfat users,noauto 0 0
/dev/disk/by-uuid/6213-12FE /media/android vfat users,noauto 0 0
/dev/disk/by-uuid/4EB1-7325 /media/kindle vfat users,noauto 0 0

/dev/sr0 /media/cdrom iso9660 users,noauto 0 0

Output of "lsblk -f":

lsblk -f
NAME        FSTYPE            LABEL     UUID                                 MOUNTPOINT
sda                                                                          
└─sda1      linux_raid_member archiso:0 23cfc192-fc5c-525f-6e74-7f67256f2287 
  └─md0                                                                      
    ├─md0p1 ext2              boot      e8c4f6c1-0235-4bbc-883b-aedd2a0599fe /boot
    ├─md0p2 ext4              root      863696d9-cb5c-49d4-a2ea-50b5188c0573 /
    └─md0p3 ext4              home      1e66419e-fdae-4b9e-9fe1-2d240781e947 /home
sdb                                                                          
└─sdb1      linux_raid_member archiso:0 23cfc192-fc5c-525f-6e74-7f67256f2287 
  └─md0                                                                      
    ├─md0p1 ext2              boot      e8c4f6c1-0235-4bbc-883b-aedd2a0599fe /boot
    ├─md0p2 ext4              root      863696d9-cb5c-49d4-a2ea-50b5188c0573 /
    └─md0p3 ext4              home      1e66419e-fdae-4b9e-9fe1-2d240781e947 /home
sdc                                                                          
└─sdc1      linux_raid_member archiso:0 23cfc192-fc5c-525f-6e74-7f67256f2287 
  └─md0                                                                      
    ├─md0p1 ext2              boot      e8c4f6c1-0235-4bbc-883b-aedd2a0599fe /boot
    ├─md0p2 ext4              root      863696d9-cb5c-49d4-a2ea-50b5188c0573 /
    └─md0p3 ext4              home      1e66419e-fdae-4b9e-9fe1-2d240781e947 /home
sde                                                                          
└─sde1      linux_raid_member archiso:0 23cfc192-fc5c-525f-6e74-7f67256f2287 
  └─md0                                                                      
    ├─md0p1 ext2              boot      e8c4f6c1-0235-4bbc-883b-aedd2a0599fe /boot
    ├─md0p2 ext4              root      863696d9-cb5c-49d4-a2ea-50b5188c0573 /
    └─md0p3 ext4              home      1e66419e-fdae-4b9e-9fe1-2d240781e947 /home
sdf                                                                          
└─sdf1      vfat                        DBE6-DDB7                            
sr0

In this case, it's actually a micro SD - USB adapter. I have tried two in case it was the adapter, but the results were the same.

ewaller · 2015-01-06 03:03:17

If I read this correctly, you are trying to mount a raid member (sdc1) that is presumably mounted as part of a raid array a second time in mount point /media/ds.

That seems fraught with danger.

phunni · 2015-01-06 14:28:02

@ewaller - no, I'm trying ot mount a USB - micro SD adapter to /media/ds. The rest of my filesystem is raid - but I'm not having any problems with mounting that...

ewaller · 2015-01-06 15:57:05

My concern is this:

mount -v /media/ds
mount: /dev/sdc1 mounted on /media/ds.

That looks like you have media/ds set as the mount point for /dev/sdc1 in your /etc/fstab. But -- /dev/sdc1 is not your microSD, it is a member of a raid array

sdc                                                                          
└─sdc1      linux_raid_member archiso:0 23cfc192-fc5c-525f-6e74-7f67256f2287 
  └─md0

I think your microSD is that vfat volume at /dev/sdf

dice · 2015-01-06 17:27:35

From what is in his fstab I think it should work. When he mounts /media/ds it should look into fstab and mount /dev/disk/by-uuid/DBE6-DDB7 which from his output of lsblk is indeed /dev/sdf1.
Did you reboot between your first and second post? It could then just be the case that the usb device was /dev/sdc in his first post and is /dev/sdf in the second post. We all know that the order in which those /dev/sdX links are assigned can change.
Don't know why the mount doesn't do anything though. Does journalctl say anything about it when you try to mount?
Is /dev/disk/by-uuid/DBE6-DDB7 pointing too the right device?

Last edited by dice (2015-01-06 17:28:39)

ewaller · 2015-01-06 17:54:40

dice wrote:

From what is in his fstab I think it should work. When he mounts /media/ds it should look into fstab and mount /dev/disk/by-uuid/DBE6-DDB7 which from his output of lsblk is indeed /dev/sdf1.

You are right. I missed that line.

dice · 2015-01-06 18:11:26

is it correct to specify the uuids in fstab with /dev/disk/by-uuid?
The wiki says e.g.

UUID=CBB6-24F2

are these two formats equivalent? Maybe this could be the problem but it's just a wild guess.

Arch Linux

#1 2015-01-05 16:11:41

Mount fails without error

#2 2015-01-05 17:33:02

Re: Mount fails without error

#3 2015-01-05 19:19:19

Re: Mount fails without error

#4 2015-01-06 03:03:17

Re: Mount fails without error

#5 2015-01-06 14:28:02

Re: Mount fails without error

#6 2015-01-06 15:57:05

Re: Mount fails without error

#7 2015-01-06 17:27:35

Re: Mount fails without error

#8 2015-01-06 17:54:40

Re: Mount fails without error

#9 2015-01-06 18:11:26

Re: Mount fails without error

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