Argthtjtr

TLDR; I have a encrypted luks partition which is a VG member I cant access, I have the password for the volume. I just want to mount it so I can get some data off of it. All of this is running on CentOS 7.

Full Story

I was adding another disk to a VG with encrypted disks. I added the partition, the VG saw the disk and added it to the VG size but I'm pretty sure I needed to expand the partition to use up the new space. I rebooted to test if perhaps that is why it wasn't seeing it. The host now boots into Emergency with the message /dev/centos/00 not found. I have moved the disks to a working machine in the hopes a full Linux system will give me more resources to fix this than a rescue volume. I have looked all over the interwebs. Most suggestions tell me to activate the vg and just mount it which fails. I usually get unknown partition type "LVM2_member"

Host: Linux netmon01 3.10.0-693.17.1.el7.x86_64 #1 SMP Thu Jan 25 20:13:58 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

blkid shows;


/dev/xvdb1: UUID="fa1fb4d3-c3cb-4b15-8fda-8e876f20db59" TYPE="swap"
/dev/xvdb2: UUID="6267702e-b278-488d-a67f-a4c638648274" TYPE="ext4"
/dev/xvda1: UUID="37005f62-f061-4517-b89c-844fd8907481" TYPE="xfs"
/dev/xvda2: UUID="ffOdMt-MJ6L-gs7r-VsYk-g18F-ggTy-jP8119" TYPE="LVM2_member"
/dev/xvdc1: UUID="e18f78eb-4192-4c6c-ba39-b4ab03e61ffb" TYPE="xfs"
/dev/xvdc2: UUID="DMaI1C-Dz8l-QrHu-Vb8v-OSbD-5OWh-xZg1NM" TYPE="LVM2_member"
/dev/xvde1: UUID="67639b4e-62c8-4774-97db-a95f0e7c89d5" TYPE="crypto_LUKS"
/dev/mapper/netmon01-root: UUID="320c2648-2b46-4553-954b-6d664266fd25" TYPE="xfs"
/dev/mapper/netmon01-swap: UUID="2bf3687a-7e16-4fa1-8102-f07cdb5f0372" TYPE="swap"
/dev/mapper/centos-01: UUID="9880703d-7ace-4146-98bc-d4b08f920d87" TYPE="swap"


The volume is question is /dev/xvdc2.


[root@netmon01 /]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 67.8M 0 rom
xvda 202:0 0 22G 0 disk
├─xvda1 202:1 0 500M 0 part /boot
└─xvda2 202:2 0 21.5G 0 part
├─netmon01-root 253:0 0 19.3G 0 lvm /
└─netmon01-swap 253:1 0 2.2G 0 lvm [SWAP]
xvdb 202:16 0 10G 0 disk
├─xvdb1 202:17 0 1G 0 part
└─xvdb2 202:18 0 9G 0 part
xvdc 202:32 0 285G 0 disk
├─xvdc1 202:33 0 476M 0 part
└─xvdc2 202:34 0 284.5G 0 part
└─centos-01 253:2 0 4G 0 lvm
xvde 202:64 0 60G 0 disk
└─xvde1 202:65 0 60G 0 part


You can see the disk is 284.5G which is the proper size.

[root@netmon01 /]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 1 0 wz--n- 284.53g 280.53g
netmon01 1 2 0 wz--n- <21.51g 44.00m


vgs shows "centos" which is the proper volume group for that disk.

[root@netmon01 /]# vgscan
Reading volume groups from cache.
Found volume group "centos" using metadata type lvm2
Found volume group "netmon01" using metadata type lvm2


A listing of the devices under /dev/mapper

[root@netmon01 /]# ls -l /dev/mapper
total 0
lrwxrwxrwx. 1 root root 7 Dec 16 23:41 centos-01 -> ../dm-2
crw-------. 1 root root 10, 236 Jul 5 04:57 control
lrwxrwxrwx. 1 root root 7 Dec 17 00:10 netmon01-root -> ../dm-0
lrwxrwxrwx. 1 root root 7 Dec 17 00:10 netmon01-swap -> ../dm-1

lvs output


[root@netmon01 /]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
01 centos -wi-a----- 4.00g
root netmon01 -wi-ao---- <19.27g
swap netmon01 -wi-ao---- <2.20g


lvdisplay output

[root@netmon01 /]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/01
LV Name 01
VG Name centos
LV UUID 6OAB5a-GxcI-eMrC-wCk3-CuiR-uOE7-YqyJfK
LV Write Access read/write
LV Creation host, time <removed>, 2017-11-02 14:39:41 -0400
LV Status available
# open 0
LV Size 4.00 GiB
Current LE 1024
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:2

--- Logical volume ---
LV Path /dev/netmon01/swap
LV Name swap
VG Name netmon01
LV UUID Lj3fuN-BbPI-MnNv-eoRC-jE4x-yi3v-x92vUg
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2017-10-02 10:39:28 -0400
LV Status available
# open 2
LV Size <2.20 GiB
Current LE 563
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1

--- Logical volume ---
LV Path /dev/netmon01/root
LV Name root
VG Name netmon01
LV UUID KVDE80-5oak-KAwu-Wyth-gOzt-i9CI-TAB3UK
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2017-10-02 10:39:28 -0400
LV Status available
# open 1
LV Size <19.27 GiB
Current LE 4932
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0

vgdisplay output

[root@netmon01 /]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 9
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 284.53 GiB
PE Size 4.00 MiB
Total PE 72840
Alloc PE / Size 1024 / 4.00 GiB
Free PE / Size 71816 / 280.53 GiB
VG UUID KFVSlE-dqqH-aF1y-NVTS-n0JM-PnQO-5QLd4S

--- Volume group ---
VG Name netmon01
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size <21.51 GiB
PE Size 4.00 MiB
Total PE 5506
Alloc PE / Size 5495 / 21.46 GiB
Free PE / Size 11 / 44.00 MiB
VG UUID TdwEhb-ufE4-sJXd-IiZo-soO6-ODxw-B92mEw

Any assistance would be greatly appreciated. Thanks in advance!