# LVM

## Overview
First to get an overview of the block device setup on the system:

```
# lsblk --fs
NAME                   FSTYPE      FSVER    LABEL UUID                                   FSAVAIL FSUSE% MOUNTPOINTS
sda
├─sda1                 vfat        FAT32          AB56-C193                               591.7M     1% /boot/efi
├─sda2                 ext4        1.0            e2e5800e-c969-4c63-b7c4-7dccc632ffac    594.7M    32% /boot
├─sda3                 swap        1              6ca673ab-3ccf-4052-a4c9-0f64346446f7                  [SWAP]
└─sda4                 LVM2_member LVM2 001       vHm4BU-Sz6m-H5me-ZePd-2OHO-XlUy-FM8deG
  ├─vg_root-lv_root    xfs                        57165c32-8a96-4315-8d1a-94249101cd7f      3.7G    77% /
  ├─vg_root-lv_var_log xfs                        54cb726f-2efb-4490-a276-19751161ba76      2.6G    34% /var/log
  ├─vg_root-lv_var     xfs                        4cc85d54-680b-4f51-89f1-d942d7793ad2      8.1G    49% /var
  ├─vg_root-lv_tmp     xfs                        8325668b-4be4-44f0-a0c3-6d347aa974fd      1.9G     2% /tmp
  └─vg_root-lv_home    xfs                        469ab242-2cdb-488f-9440-aae9c8f185bd       13G    35% /home
sr0
#
```

and configured in LVM as physical volumes:

```
# pvs
  PV         VG      Fmt  Attr PSize   PFree
  /dev/sda4  vg_root lvm2 a--  <58.38g 384.00m
#
```

and the logical volumes:

```
# lvs
  LV         VG      Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  lv_home    vg_root -wi-ao---- 20.00g
  lv_root    vg_root -wi-ao---- 16.00g
  lv_tmp     vg_root -wi-ao----  2.00g
  lv_var     vg_root -wi-ao---- 16.00g
  lv_var_log vg_root -wi-ao----  4.00g
#
```

## Recovering a Lost LVM Volume Disk

This [guide](https://www.suse.com/c/recovering-lost-lvm-volume-disk/) is rather helpful in doing so.

If you miss physical volumes you see in the block device setup (`lsblk --fs`), then you should check out if there is a `filter` setting in `/etc/lvm/lvm.conf` or some device files in `/etc/lvm/devices/`. If you want to see everything in the LVM tools you should remove these device files and the filter setting.