[SOLVED] need help mounting my LVM volume

linuxUser247 · 06-07-2020, 06:47 AM

I set up a LVM volume on an external hard drive. I mounted this drive to another machine. Here is what it looks like:

Code:

  --- Physical volume ---
  PV Name               /dev/sda1
  VG Name               vg-main
  PV Size               931.48 GiB / not usable 3.98 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              238458
  Free PE               235898
  Allocated PE          2560
  PV UUID               87oFY6-8MaZ-pQ98-ncMV-Swh3-nOBm-om3MTf
   
  --- Physical Segments ---
  Physical extent 0 to 2559:
    Logical volume	/dev/vg-main/data
    Logical extents	0 to 2559
  Physical extent 2560 to 238457:
    FREE

Code:

lsblk
NAME              MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
loop0               7:0    0  45.5M  1 loop /snap/core18/1706
loop1               7:1    0  22.4M  1 loop /snap/snapd/7266
loop2               7:2    0  45.5M  1 loop /snap/core18/1751
loop3               7:3    0  54.2M  1 loop /snap/lxd/14807
loop4               7:4    0  54.3M  1 loop /snap/lxd/15362
loop5               7:5    0    25M  1 loop /snap/snapd/7779
sda                 8:0    0 931.5G  0 disk 
└─sda1              8:1    0 931.5G  0 part 
  └─vg--main-data 253:0    0    10G  0 lvm  
mmcblk0           179:0    0  14.5G  0 disk 
├─mmcblk0p1       179:1    0   256M  0 part /boot/firmware
└─mmcblk0p2       179:2    0  14.3G  0 part /

it is currently not mounted:

Code:

df -h /opt
Filesystem      Size  Used Avail Use% Mounted on
/dev/mmcblk0p2   14G  2.2G   12G  16% /

I would normally mount it like this:

Code:

sudo mount /dev/vg-main/data /opt

the command executes silently. The results are unimpressive:

Code:

df -h /opt
Filesystem      Size  Used Avail Use% Mounted on
/dev/mmcblk0p2   14G  2.2G   12G  16% /

I cannot mount the device directly:

Code:

sudo mount /dev/sda1 /opt
mount: /opt: unknown filesystem type 'LVM2_member'.

which makes sense, because there's no filesystem on sda1.

somehow I don't see what I did wrong, I am not using LVMs a lot so I am probably missing something stupid

rknichols · 06-07-2020, 07:40 AM

Quote:

Originally Posted by linuxUser247

I would normally mount it like this:

Code:

sudo mount /dev/vg-main/data /opt

the command executes silently. The results are unimpressive:

Code:

df -h /opt
Filesystem      Size  Used Avail Use% Mounted on
/dev/mmcblk0p2   14G  2.2G   12G  16% /

Strange that the mount command apparently failed silently. Try that with the "-v" option:

Code:

sudo mount -v /dev/vg-main/data /opt

Also, what is the output when you run the "lvs" command?

linuxUser247 · 06-07-2020, 08:07 AM

thank you for your help

. Here are the results:

Code:

sudo mount -v /dev/vg-main/data /opt
mount: /dev/mapper/vg--main-data mounted on /opt.

Code:

df -h /opt 
Filesystem      Size  Used Avail Use% Mounted on
/dev/mmcblk0p2   14G  2.2G   12G  17% /

/dev/mmcblk0p2 is the system drive, expected would be /dev/sda1

Code:

sudo lvs
  LV    VG      Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  data  vg-main -wi-a----- 10.00g                                                    
  data2 vg-main -wi-a----- 20.00g

meanwhile, I created another logical volume, data2, to get my system running...

shruggy · 06-07-2020, 08:17 AM

Before mounting, try

Code:

sudo lvchange -ay vg-main/data

linuxUser247 · 06-07-2020, 08:17 AM

big news, I am able to mount the volume to /mnt/data:

Code:

df -h /mnt/data
Filesystem                 Size  Used Avail Use% Mounted on
/dev/mapper/vg--main-data  9.8G  435M  8.9G   5% /mnt/data

now, mounting on /opt doesn't work because...

Code:

ls -la /opt
total 8
drwxr-xr-x  2 root root 4096 Apr 23 15:02 .
drwxr-xr-x 20 root root 4096 Jun  7 12:49 ..

linuxUser247 · 06-07-2020, 03:39 PM

Quote:

Originally Posted by linuxUser247

big news, I am able to mount the volume to /mnt/data:

now, mounting on /opt doesn't work because...

I was finally able to solve my issue:

Code:

sudo rmdir /opt
sudo mkdir /opt
sudo mount /dev/vg-main/data /opt

Done, all my problems solved!!! As of why this is, I HAVE NO FREEKIN IDEA. Linux just makes my live hell, I don't know what I did to it to deserve that