lvm

vgcreate
pvdisplay
lvdisplay
lvcreate
Resize EC2 file system with LVM
pvcreate Device /dev/sdb excluded by a filter
How to Remove a logical volume
Mounting partition stored inside Logical Volume
How to add physical volume and resize LVM

Some related commands

cfdisk
vgextend vg /dev/sda5
lvextend -l+100%FREE /dev/vg/lv_root
resize2fs /dev/mapper/vg-lv_root

When I try to mount a partition I get error

mount: unknown filesystem type ‘LVM2_member’

This is because the partition is LVM. Got it fixed with

root@sysresccd /root % parted -l
Model: ATA Samsung SSD 850 (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  3146kB  2097kB  primary
 2      3146kB  527MB   524MB   primary  ext2         boot
 3      527MB   500GB   500GB   primary               lvm


root@sysresccd /root % mount /dev/sda3 /mnt
mount: unknown filesystem type 'LVM2_member'
root@sysresccd /root % lvmdiskscan
  WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
  /dev/loop0          [     275.14 MiB]
  /dev/mapper/vg-swap [      15.75 GiB]
  /dev/sda1           [       2.00 MiB]
  /dev/mapper/vg-tmp  [       1.00 GiB]
  /dev/sda2           [     500.00 MiB]
  /dev/mapper/vg-root [     448.46 GiB]
  /dev/sda3           [     465.27 GiB] LVM physical volume
  3 disks
  3 partitions
  0 LVM physical volume whole disks
  1 LVM physical volume
root@sysresccd /root % lvscan
  WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
  ACTIVE            '/dev/vg/swap' [15.75 GiB] inherit
  ACTIVE            '/dev/vg/tmp' [1.00 GiB] inherit
  ACTIVE            '/dev/vg/root' [448.46 GiB] inherit
root@sysresccd /root % mount /dev/vg/root /mnt
root@sysresccd /root %