#1 2017-07-06 06:17:33

linux_user

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Registered: 2016-11-04

Posts: 484

[SOLVED] Live USB can't read HDD with LVM

I am using a live persistent USB stick on a system which is already running BL with LVM enabled. Is it because LVM is enabled that I am not able to read the contents of the HDD? This is how it appears on File Manager.

500 GB hard disk shows are 255 MB volume - http://en.zimagez.com/zimage/2017-07-06 … 4scrot.php

Contens after opening the volume - http://en.zimagez.com/zimage/2017-07-06 … 4scrot.php

Gparted from the live USB stick showing the HDD - http://en.zimagez.com/zimage/2017-07-06 … 4scrot.php

Last edited by linux_user (2017-08-16 07:33:23)

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Head_on_a_Stick

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Registered: 2015-09-29

Posts: 9,067

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Re: [SOLVED] Live USB can't read HDD with LVM

http://www.tuxradar.com/answers/296

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linux_user

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Registered: 2016-11-04

Posts: 484

Re: [SOLVED] Live USB can't read HDD with LVM

http://www.tuxradar.com/answers/296

The page says, "As long as you have the LVM tools installed on the distro you are booting, you can mount LVM partitions from any disk." I am not sure if the live USB stick is made with LVM. I created it using this method.

sudo vgscan gives the following output -

sudo: vgscan: command not found

Last edited by linux_user (2017-07-11 18:16:25)

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Head_on_a_Stick

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From: London

Registered: 2015-09-29

Posts: 9,067

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Re: [SOLVED] Live USB can't read HDD with LVM

So try:

sudo apt install lvm2

We should probably add that package to the ISO image so thanks for bringing this up.

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linux_user

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Registered: 2016-11-04

Posts: 484

Re: [SOLVED] Live USB can't read HDD with LVM

So try:

sudo apt install lvm2

We should probably add that package to the ISO image so thanks for bringing this up.

Ok, LVM installed.

user@debian:~$ sudo vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "linux-vg" using metadata type lvm2

user@debian:~$ sudo vgchange -a y
  3 logical volume(s) in volume group "linux-vg" now active

Now according to the article, "all the partitions should have devices created in the form /dev/volumegroup/logicalvolume, which you can then mount in the usual way:"

user@debian:~$ sudo mount /dev/volumegroup/logicalvolume /mnt
mount: special device /dev/volumegroup/logicalvolume does not exist

How do I find these partitions? They should be having an identifier for each. Fdisk -l doesn't help me, nor is there the folder volumegroup inside /dev.

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devnull

Member

Registered: 2017-06-29

Posts: 69

Re: [SOLVED] Live USB can't read HDD with LVM

try wth lsblk or df -h to find ou what partitions are there and where are they currently mounted

Last edited by devnull (2018-01-08 23:19:03)

cloverskull

Member

Registered: 2015-10-01

Posts: 348

Re: [SOLVED] Live USB can't read HDD with LVM

So try:

sudo apt install lvm2

We should probably add that package to the ISO image so thanks for bringing this up.

This is a good idea. I've used the live ISO a few times to try rescue operations and have had to manually install lvm2 each time.

linux_user

50/50 it's a spam account

Registered: 2016-11-04

Posts: 484

Re: [SOLVED] Live USB can't read HDD with LVM

try wth lsblik or df -h to find ou what partitions are there and where are they currently mounted

user@debian:~$ sudo lsblk
NAME            MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda               8:0    0 465.8G  0 disk 
├─sda1            8:1    0   243M  0 part 
├─sda2            8:2    0     1K  0 part 
└─sda5            8:5    0 465.5G  0 part 
  ├─linux--vg-root
                254:0    0   9.3G  0 lvm  
  ├─linux--vg-swap_1
                254:1    0     8G  0 lvm  
  └─linux--vg-home
                254:2    0 448.3G  0 lvm  
sdb               8:16   1   7.5G  0 disk 
├─sdb1            8:17   1     1G  0 part /lib/live/mount/persistence/sdb1
└─sdb2            8:18   1   6.5G  0 part /lib/live/mount/persistence/sdb2
sr0              11:0    1  1024M  0 rom  
loop0             7:0    0   706M  1 loop /lib/live/mount/rootfs/filesystem.squashfs

So, I tried to mount sda5 using the following commands,

user@debian:~$ sudo mount /dev/sda5 /mnt
mount: unknown filesystem type 'LVM2_member'
user@debian:~$ sudo mount /dev/sda5/linux--vg-home /mnt
mount: special device /dev/sda5/linux--vg-home does not exist (a path prefix is not a directory)
user@debian:~$ sudo mount /dev/sda5/linux--vg-root /mnt
mount: special device /dev/sda5/linux--vg-root does not exist (a path prefix is not a directory)

I then finally tried,

user@debian:~$ sudo mount /dev/sda1 /mnt
user@debian:~$ 

481GB drive is mounted (the home volume), and another 10GB drive is also mounted (the root volume). .

Seems everything is fine. Thanks to all. Marking it as solved.

Last edited by linux_user (2017-08-16 07:27:43)

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"Blind faith to authority is the greatest enemy of truth."