Convert MBR to GPT in AWS

 First check partition type of existing disk.

 parted -l

 

To convert MBR to GPT, create one partition with gpt and that will convert entire disk from msdos to gpt.

gdisk /dev/nvme0n1

■ n (i.e. new partition)
■ Enter (i.e Partition number : 2-128, default 2)
■ Enter (i.e. First sector : default = 34)
■ Enter (i.e. Last sector : default = 2047)
■ ef02 (i.e. Type of partition: BIOS boot partition)
■ w (i.e. Write the new partition table)
■ Y (i.e. Complete process)

Reload the partition table 

partprobe /dev/nvme0n1  

Re-install the GRUB boot loader using the new partition scheme 

grub-install /dev/nvme0n1
 

Increasing EBS volume 

growpart /dev/nvme0n1 1
resize2fs /dev/nvme0n1p1

Now Re-check the partition table created properly or not.

parted -l