This post is also available in: Türkçe
In this article provides steps for extending the root partition residing in a logical volume created with Logical Volume Manager (LVM) in a virtual machine running Red Hat/Cent OS.
To extend the logical volume:
Note: These steps only apply to EXT3 file systems.
Caution: VMware recommends to take a complete backup of the virtual machine prior to making these changes.
- Power off the virtual machine.
- Edit the virtual machine settings and extend the virtual disk size.
- Power on the virtual machine.
- Identify the device name, which is by default /dev/sda, and confirm the new size by running the command:
# fdisk -l
- Create a new primary partition:
- Run the command:# fdisk /dev/sda (depending the results of the step 4)
- Press p to print the partition table to identify the number of partitions. By default, there are 2: sda1 and sda2.
- Press n to create a new primary partition.
- Press p for primary.
- Press 3 for the partition number, depending on the output of the partition table print.
- Press Enter two times.
- Press t to change the system’s partition ID.
- Press 3 to select the newly creation partition.
- Type 8e to change the Hex Code of the partition for Linux LVM.
- Press w to write the changes to the partition table.
- Restart the virtual machine.
- Run this command to verify that the changes were saved to the partition table and that the new partition has an 8e type:
# fdisk -l
- Run this command to convert the new partition to a physical volume:Note: The number for the sda can change depending on system setup. Use the sda number that was created in step 5.
# pvcreate /dev/sda3
- Run this command to extend the physical volume:
# vgextend VolGroup00 /dev/sda3
Note: To determine which volume group to extend, use the command vgdisplay.
- Run this command to verify how many physical extents are available to the Volume Group:# vgdisplay VolGroup00 | grep “Free”
- Run the following command to extend the Logical Volume:
# lvextend -L+#G /dev/VolGroup00/LogVol00Where
Where # is the number of Free space in GB available as per the previous command. Use the full number output from Step 10 including any decimals.
Note: To determine which logical volume to extend, use the command lvdisplay.
- Run the following command to expand the ext3 filesystem online, inside of the Logical Volume:
# ext2online /dev/VolGroup00/LogVol00
– Use resize2fs instead of ext2online for non-Red Hat virtual machines.
– Use xfs_growfs for Red Hat, CentOS 7 and other VM Guest OS types that use the XFS file system.
- Run the following command to verify that the / filesystem has the new space available:
# df -h /