Resize the file system of a raw disk

Scenarios

After you expand the capacity of an EBS volume that has no partitions but a file system, you can directly resize the file system.

Prerequisites

1. You have created a snapshot to back up the data on the EBS volume. To prevent data loss caused by misoperations, we recommend that you create a snapshot to back up data before you expand the capacity of an EBS volume.
2. You have expanded the capacity of the EBS volume in the EBS console.
3. The type of the file system on the EBS volume is ext2, ext3, ext4, or xfs, and the file system contains no errors.

Operating environment

Operating environment

Procedure

1. Run the following command to view the information about the file systems on the data disks attached to your KEC instance:

   df -Th
   

The following figure shows the output.

The following table describes the information extracted from the figure.

2. In the operating system of your KEC instance, resize a file system by running one of the following commands based on the type of the file system.

   • If the type of the file system is in the format of ext*, such as ext4, run the following command:
     Resize the file system on the /dev/vdb data disk

     resize2fs /dev/vdb
     

     The following figure shows the output.
     

     Note: In the preceding command, /dev/vdb is the name of the data disk for which you want to allocate the expanded capacity. You must change it based on your business requirements.

   • If the type of the file system is xfs, run the following commands:
     Mount the data disk to a directory

     mount | grep /dev/vdc
     

     Resize the file system on the /dev/vdc data disk

     xfs_growfs /mnt/data_disk02
     

     The following figure shows the output.
     

     Note: In the preceding commands, /mnt/data_disk02 is the mount point of the /dev/vdc data disk. You must change it based on your business requirements.

3. Run the following command to check the resizing results:

   df -Th
   

   The following figure shows the output.
   
   The figure shows that the resizing succeeded. When you check the results, compare the results with the original capacities.

   • If the resizing succeeded, the business programs on the KEC instance can continue to run as expected.
   • If the resizing failed, use the snapshot to roll back the data.