Extend a disk

Tutorial to extend a disk or partition in Linux.

Show partition table

Before we can expand a disk, we need to determine what type of disk or partition we have.

To do this I suggest displaying the partition table:

sudo fdisk -l /dev/sda

Disk /dev/sda: 33 GiB, 35433480192 bytes, 69206016 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0baa69a2

Device     Boot   Start      End  Sectors  Size Id Type
/dev/sda1  *       2048   999423   997376  487M 83 Linux
/dev/sda2       1001470 67106815 66105346 31.5G  5 Extended
/dev/sda5       1001472 67106815 66105344 31.5G 8e Linux LVM

To display all disks, use the following command: sudo fdisk -l

Extend partitions

Before we can resize the volume, we need to resize the partition. In the example, there is a partition of type "extended" (/dev/sda2) and it contains a partition of type "logical lvm" (/dev/sda5). We need to resize them both.

sudo parted /dev/sda

GNU Parted 3.2
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 35.4GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start   End     Size    Type      File system  Flags
 1      1049kB  512MB   511MB   primary   ext2         boot
 2      513MB   34.4GB  33.8GB  extended
 5      513MB   34.4GB  33.8GB  logical                lvm

(parted) resizepart 2 100%
(parted) resizepart 5 100%
(parted) quit

Extend an LVM volume

You need to start by expanding the physical volume.

sudo pvresize /dev/sda5

View the space available in the volume.

sudo vgs

  VG      #PV #LV #SN Attr   VSize  VFree
  demo-vg   1   2   0 wz--n- 32.52g 1.05g

The name of the volume (VG) is demo-vg.

View logical volumes.

sudo lvs

  LV     VG      Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root   demo-vg -wi-ao---- 27.48g
  swap_1 demo-vg -wi-ao----  4.00g

You can then expand the logical volume.

sudo lvresize --size +1G --resizefs /dev/demo-vg/root #This command will increase the partition by 1 Gb.
sudo lvresize --extents +100%FREE --resizefs /dev/demo-vg/root #Uses all of the free space available in the physical volume.

Resize a disk without LVM

The following command resizes a disk without LVM to the size of the partition. (In case the root disk is sda1)

sudo resize2fs /dev/sda1

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