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Home Operating System Linux

How to Add a New Disk Larger Than 2TB to An Existing Linux

How VPS by How VPS
November 2, 2018
in Linux, Operating System
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Have you ever tried to do the partitioning of hard disk larger than 2TB using fdisk utility and wondered why you end up getting a warning to use GPT? Yes, you got that right. We cannot partition a hard disk larger than 2TB using fdisk tool.

In such cases, we can use parted command. The major difference lies in the partitioning formats that fdisk uses DOS partitioning table format and parted uses GPT format.

TIP: You can use gdisk as well instead of parted tool.

In this article, we will show you to add a new disk larger than 2TB to an existing Linux server such as RHEL/CentOS or Debian/Ubuntu.

I am using fdisk and parted utilities to do this configuration.

First list the current partition details using fdisk command as shown.

# fdisk -l
How to Add a New Disk Larger Than 2TB to An Existing Linux

List Linux Partition Table

For the purpose of this article, I am attaching a hard disk of 20GB capacity, which can be followed for disk larger than 2TB as well. Once you added a disk, verify the partition table using same fdisk command as shown.

# fdisk -l
How to Add a New Disk Larger Than 2TB to An Existing Linux

List New Partition Table

Tip: If you are adding a physical hard disk, you may find that partitions already created. In such cases, you can use fdsik to delete the same before using parted.

# fdisk /dev/xvdd

Use d switch for the command to delete the partition and w to write the changes and quit.

How to Add a New Disk Larger Than 2TB to An Existing Linux

Delete Linux Partition

Important: You need to be careful while deleting the partition. This will erase the data on the disk.

Now its time to partition a new hard disk using parted command.

# parted /dev/xvdd

Set the partition table format to GPT

(parted) mklabel gpt

Create the Primary partition and assign the disk capacity, here I am using 20GB (in your case it would be 2TB).

(parted) mkpart primary 0GB 20GB
How to Add a New Disk Larger Than 2TB to An Existing Linux

Create Partition using Parted

Just for curiosity, let’s see how this new partition is listed in fdisk.

# fdisk /dev/xvdd
How to Add a New Disk Larger Than 2TB to An Existing Linux

Verify Partition Details

Now format and then mount the partition and add the same in /etc/fstab which controls the file systems to be mounted when the system boots.

# mkfs.ext4 /dev/xvdd1
How to Add a New Disk Larger Than 2TB to An Existing Linux

Format Linux Partition

Once partition has been formatted, now it’s time mount the partition under /data1.

# mount /dev/xvdd1 /data1

For permanent mounting add the entry in /etc/fstab file.

/dev/xvdd1     /data1      ext4      defaults  0   0

Important: Kernel should support GPT in order to partition using GPT format. By default RHEL/CentOS have Kernel with GPT support, but for Debian/Ubuntu you need to recompile the kernel after changing the config.

That’s it! In this article, we have shown you how to use the parted command. Share your comments and feedback with us.

Source: tecmint.com

Tags: Linux Commandslinux guidelinux vps setup guide
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