How do I extend an Amazon EBS volume with RAID 0 partitions?

Short description

Important: If you don't require RAID 0 partitions, then you can use General Purpose SSD (gp3) volumes for higher volume-level quotas and improved performance. For more information, see Amazon EBS increases the maximum size and provisioned performance of General Purpose (gp3) volumes.

Resolution

Note: It isn't a best practice to use RAID 1, RAID 5, and RAID 6 for Amazon EBS. For more information, see Amazon EBS and RAID configuration.

Prerequisites:

• Verify that you have multiple EBS volumes of identical size and IOPS performance for your array.
• Attach the volumes to an Amazon Elastic Compute Cloud (Amazon EC2) instance.
• Create a RAID 0 array on an EC2 Linux instance.
• Create a crash-consistent multi-volume snapshot in a RAID array as a backup.

Extend the EBS volume

1. To view current RAID-level information, run the following command:

   sudo mdadm --detail /dev/RAID_DEVICE

   Note: Replace /dev/RAID_DEVICE with the mapping for your RAID configuration.
2. Increase the size of EBS volumes that are part of the RAID configuration.
   Note: For example, if you have two 10 GiB EBS volumes in the RAID 0 partition, then modify the volumes to the volume extension size that you want. To add 40 GiB, increase the size by 20 GiB on each volume.
3. To unmount the file system, run the following command:

   sudo umount /MOUNT_PATH

   Note: Replace MOUNT_PATH with your mount path.
4. To stop the RAID device, run the following command:

   sudo mdadm --stop /dev/RAID_DEVICE

   Note: Replace RAID_DEVICE with the mapping of your RAID configuration. You must stop the RAID device before you reassemble the RAID volumes.
5. To integrate and reassemble the volumes with the updated sizes, run the following command:

   sudo mdadm --assemble --update=devicesize /dev/RAID_DEVICE LIST_OF_DEVICES

   Note: Replace RAID_DEVICE with the mapping of your RAID configuration. Replace LIST_OF_DEVICES with the device names of your EBS volumes, such as /dev/sdb or /dev/sdc.
6. To verify that the RAID configuration has the new size, run the following command:

   sudo mdadm --detail /dev/RAID_DEVICE

   Note: Replace RAID_DEVICE with the mapping of your RAID configuration. The preceding command's output displays the combined increased size under Array Size.
7. To mount the file system, run the following command:

   sudo mount -t TYPE /dev/RAID_DEVICE /MOUNT_PATH

   Note: Replace TYPE with the file system, such as ext3, ext4, or xfs. Replace RAID_DEVICE with the mapping of your RAID configuration and MOUNT_PATH with your mount path.
8. To extend the file system size, run one of the following commands.
   For xfs file systems:

   sudo xfs_growfs /MOUNT_PATH

   Note: Replace MOUNT_PATH with your mount path.
   For other file systems, including ext3 and ext4:

   sudo resize2fs /MOUNT_PATH

   Note: Replace MOUNT_PATH with your mount path.
9. To verify that you have successfully extended the file system size, run the following command:

   df -h