Create and manage Linux volumes (LVM)

Linux LVM

Create the physical volume:

pvcreate /dev/sdb

Create the Volume Group:

vgcreate vg_backuppc_storage /dev/sdb

Create the logical volume:

lvcreate -l +100%FREE vg_backuppc_storage

Create a filesystem on the logical volume:

mkfs.ext4 /dev/vg_backuppc_storage/lvol0

Resize the physical volume: (need to unmount the LV before doing this)

pvresize /dev/sdb

Extend the volume:

lvextend -l +100%FREE -r /dev/vg_backuppc_storage/lvol0

Mount your new volume:

mount /dev/mapper/vg_backuppc_storage-lvol0 /mnt/

Depending on the size of your volume, the extend process can take a minute or so.
It (lvextend) begins with this message:

lvextend -l +100%FREE -r /dev/vg_backuppc_storage/lvol0
fsck from util-linux 2.20.1

And when complete you should see this:

lvextend -l +100%FREE -r /dev/vg_backuppc_storage/lvol0
fsck from util-linux 2.20.1
/dev/mapper/vg_backuppc_storage-lvol0: 2319610/268435456 files (0.2% non-contiguous), 64542817/1073740800 blocks
  Extending logical volume lvol0 to 6.00 TiB
  Logical volume lvol0 successfully resized
resize2fs 1.42.5 (29-Jul-2012)
Resizing the filesystem on /dev/mapper/vg_backuppc_storage-lvol0 to 1610611712 (4k) blocks.

Viewing physical and logical volume status:
You can view the volume status using ‘vgdisplay’

--- Volume group ---
  VG Name               vg_backuppc_storage
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               6.00 TiB
  PE Size               4.00 MiB
  Total PE              1572863
  Alloc PE / Size       1572863 / 6.00 TiB
  Free  PE / Size       0 / 0
  VG UUID               dsxTN6-xiNr-ZOBp-wezG-1h4K-D0E6-1zrSxo

Logical volume status

 --- Logical volume ---
  LV Path                /dev/vg_backuppc_storage/lvol0
  LV Name                lvol0
  VG Name                vg_backuppc_storage
  LV UUID                bGLTfT-hlF9-3WLw-wT8O-BhHV-pVVi-WudMvK
  LV Write Access        read/write
  LV Creation host, time backuppc, 2014-11-14 14:57:31 +0000
  LV Status              available
  # open                 1
  LV Size                6.00 TiB
  Current LE             1572863
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:3