13.5. Resizing a Partition with fdisk

Procedure 13.4. Resizing a Partition

1. Unmount the device:

   # umount /dev/vda

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2. Run fdisk disk_name. For example:

   # fdisk /dev/vda
   Welcome to fdisk (util-linux 2.23.2).
   
   Changes will remain in memory only, until you decide to write them. Be careful before using the write command.
   
   Command (m for help):
   

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3. Use the p option to determine the line number of the partition to be deleted.

   Command (m for help): p
   Disk /dev/vda: 16.1 GB, 16106127360 bytes, 31457280 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
   Disk label type: dos
   Disk identifier: 0x0006d09a
   
   Device    Boot      Start         End      Blocks   Id  System
   /dev/vda1   *        2048     1026047      512000   83  Linux
   /dev/vda2         1026048    31457279    15215616   8e  Linux LVM
   

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4. Use the d option to delete a partition. If there is more than one partition available, fdisk prompts you to provide a number of the partition to delete:

   Command (m for help): d
   Partition number (1,2, default 2): 2
   Partition 2 is deleted
   

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5. Use the n option to create a partition and follow the prompts. Allow enough space for any future resizing. The fdisk default behavior (press Enter) is to use all space on the device. You can specify the end of the partition by sectors, or specify a human-readable size by using +<size><suffix>, for example +500M, or +10G.
   Red Hat recommends using the human-readable size specification if you do not want to use all free space, as fdisk aligns the end of the partition with the physical sectors. If you specify the size by providing an exact number (in sectors), fdisk does not align the end of the partition.

   Command (m for help): n
   Partition type:
      p   primary (1 primary, 0 extended, 3 free)
      e   extended
   Select (default p): *Enter*
   Using default response p
   Partition number (2-4, default 2): *Enter*
   First sector (1026048-31457279, default 1026048): *Enter*
   Using default value 1026048
   Last sector, +sectors or +size{K,M,G} (1026048-31457279, default 31457279): +500M
   Partition 2 of type Linux and of size 500 MiB is set
   

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6. Set the partition type to LVM:

   Command (m for help): t
   Partition number (1,2, default 2): *Enter*
   Hex code (type L to list all codes): 8e
   Changed type of partition 'Linux' to 'Linux LVM'
   

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7. Write the changes with the w option when you are sure the changes are correct, as errors can cause instability with the selected partition.
8. Run e2fsck on the device to check for consistency:

   # e2fsck /dev/vda
   e2fsck 1.41.12 (17-May-2010)
   Pass 1:Checking inodes, blocks, and sizes
   Pass 2:Checking directory structure
   Pass 3:Checking directory connectivity
   Pass 4:Checking reference counts
   Pass 5:Checking group summary information
   ext4-1:11/131072 files (0.0% non-contiguous),27050/524128 blocks
   

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9. Mount the device:

   # mount /dev/vda

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