Resize disks

This guide shows you how to increase the size of a disk and extend the filesystem to use the additional space.

Prerequisites

  • A disk attached to a VM
  • SSH access to the VM (for filesystem extension)

Increase a disk's size

You can only increase a disk's size — you can't decrease it. You don't need to stop the VM to resize the disk.

Resize using the CLI

evroc compute disk update mydisk \
  --size-amount=200 \
  --size-unit=GB

Resize using the API

curl -X PATCH https://api.evroc.com/compute/v1beta1/projects/{projectID}/regions/{regionName}/disks/mydisk \
  -H "Content-Type: application/json" \
  -d '{
    "spec": {
      "diskSize": {
        "amount": 200,
        "unit": "GB"
      }
    }
  }'

Extend the filesystem inside the VM

After increasing the disk size, the block device is automatically larger. Verify this with lsblk:

lsblk

However, you must extend the partition and filesystem to use the new space.

For ext4 filesystems

  1. Extend the partition using growpart: 
    sudo growpart /dev/vdb 1
  2. Resize the filesystem: 
    sudo resize2fs /dev/vdb1

For XFS filesystems

  1. Extend the partition using growpart: 
    sudo growpart /dev/vdb 1
  2. Grow the XFS filesystem: 
    sudo xfs_growfs /mnt/mydisk

Note: Replace /dev/vdb and /dev/vdb1 with your actual device and partition names. Use lsblk to confirm the correct device names.

What disk types can be resized?

Disk resizing works for:

  • Boot disks
  • Data disks (including hotswap-attached disks)

Next steps