LVM fdisk

fdisk -l
fdisk /dev/sdb
root@Mega:~# fdisk /dev/sdb

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
Partition number (1-4): 1
First cylinder (1-2610, default 1): "enter"
Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): "enter"
Using default value 2610

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): w

The partition table has been altered!
Calling ioctl() to re-read partition table.

Syncing disks.
root@Mega:~# pvcreate /dev/sdb1

Physical volume "/dev/sdb1" successfully created
root@Mega:~# vgdisplay
  --- Volume group ---
  VG Name               Mega
  VG Size               19.76 GiB
root@Mega:~# vgextend Mega /dev/sdb1
  Volume group "Mega" successfully extended
root@Mega:~# pvscan
  PV /dev/sda5   VG Mega   lvm2 [19.76 GiB / 0    free]
  PV /dev/sdb1   VG Mega   lvm2 [19.99 GiB / 19.99 GiB free]
  Total: 2 [39.75 GiB] / in use: 2 [39.75 GiB] / in no VG: 0 [0   ]
root@Mega:~# lvdisplay
  --- Logical volume ---
  LV Name                /dev/Mega/root
  LV Size                18.91 GiB
root@Mega:~# lvextend /dev/Mega/root /dev/sdb1
  Extending logical volume root to 38.90 GiB
  Logical volume root successfully resized
root@Mega:~# resize2fs /dev/Mega/root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/Mega/root is mounted on /; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 3
Performing an on-line resize of /dev/Mega/root to 10196992 (4k)blocks.
The filesystem on /dev/Mega/root is now 10196992 blocks long.

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