MBT to GPT format change

Question

Hi,
We have a 2TB volume m5.2xlarge instance, the root volume limit is 2TB and cannot increase the size because of size limit of it being MBR partion.

Model: Amazon Elastic Block Store (nvme)
Disk /dev/nvme0n1: 2147GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

The only way out seems https://aws.amazon.com/premiumsupport/knowledge-center/ec2-ubuntu-convert-mbr-to-gpt/
Is that the only way out here, is there a better way of increasing the limit without data loss?

Answer

Hello,

There are many ways to prevent data loss that include the use of third-party software however a suggested method is using a gdisk tool.

Before altering any compute format changes, we highly recommend to deploy your snapshot, create an image from the snapshot and deploy into to a different Availability Zone to further increase availability and security of data.

According to volume requirements for Windows and Linux [1], the MBR default partition limits its max size to 2TB and does not allow any increases past this. We recommend creating a GPT formatted disk and copying over the data from the MBR. In the requirements there are steps outlined to create and copy data over from MBR to GPT. A suggested gdisk tool can be found here: [Sourceforge GPT fdisk download](https://sourceforge.net/projects/gptfdisk/) [2].

Best,

1: [volume-requirements](https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/modify-volume-requirements.html)

2: [Sourceforge GPT fdisk](https://sourceforge.net/projects/gptfdisk/)

MBT to GPT format change

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