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You will see a warning which basically means in order to use the new table with the changes a system reboot is required.If you can not see the new partition using “fdisk -l” you may be able to run “partprobe -s” to rescan the partitions.If you are working with virtual machines make sure you take a snapshot of your virtual machine beforehand, or otherwise have some other form of up to date backup before proceeding.Note that a snapshot must not be taken until after the virtual disk has been increased, otherwise you will not be able to increase it.Update 18/04/2015: I have created a video guide of this post in Cent OS 7 shown below.Important Note: Be very careful when working with the commands in this article as they have the potential to cause a lot of damage to your data.
If you are not able to modify the size of the disk, the provisioned size setting is greyed out.
As this method focuses on working with LVM, we will first confirm that our partition type is actually Linux LVM by running the below command.
As you can see in the above image /dev/sda5 is listed as “Linux LVM” and it has the ID of 8e.
For increasing the size of a Linux native partition (hex code 83) see this article.
Below is the disk information showing that our initial setup only has the one 20gb disk currently, which is under the logical volume named /dev/mapper/Mega-root – this is what we will be expanding with the new disk.