Arch Linux

phunni

Member

From: Bristol, UK

Registered: 2003-08-13

Posts: 794

Mount fails without error

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

Member

From: Germany

Registered: 2014-02-10

Posts: 413

Re: Mount fails without error

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?

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I put at button on it. Yes. I wish to press it, but I'm not sure what will happen if I do.  (Gune | Titan A.E.)

phunni

Member

From: Bristol, UK

Registered: 2003-08-13

Posts: 794

Re: Mount fails without error

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

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,670

Re: Mount fails without error

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.

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Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
The shortest way to ruin a country is to give power to demagogues.— Dionysius of Halicarnassus
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How to Ask Questions the Smart Way

phunni

Member

From: Bristol, UK

Registered: 2003-08-13

Posts: 794

Re: Mount fails without error

@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

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,670

Re: Mount fails without error

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

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Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
The shortest way to ruin a country is to give power to demagogues.— Dionysius of Halicarnassus
---
How to Ask Questions the Smart Way

dice

Member

From: Germany

Registered: 2014-02-10

Posts: 413

Re: Mount fails without error

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)

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I put at button on it. Yes. I wish to press it, but I'm not sure what will happen if I do.  (Gune | Titan A.E.)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,670

Re: Mount fails without error

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.

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Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
The shortest way to ruin a country is to give power to demagogues.— Dionysius of Halicarnassus
---
How to Ask Questions the Smart Way

dice

Member

From: Germany

Registered: 2014-02-10

Posts: 413

Re: Mount fails without error

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.

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I put at button on it. Yes. I wish to press it, but I'm not sure what will happen if I do.  (Gune | Titan A.E.)