The lvresize command is used to adjust the size of a logical volume. It can be used to increase or decrease the size of an existing logical volume. This command is very useful when you need to resize a logical volume to accommodate more data or free up space.
Overview
The lvresize command has two main modes of operation: shrinking and expanding. When shrinking a logical volume, you can reduce the size of the file system and then shrink the logical volume to match. When expanding a logical volume, you can first increase the size of the logical volume and then expand the file system to match.
Expanding a Logical Volume
To expand a logical volume, you can use the following command:
lvresize -L +<size> <logical_volume>
This command will increase the size of the logical volume by the specified amount. For example, if you want to increase the size of a logical volume named data by 10 gigabytes, you would use the following command:
lvresize -L +10G data
Shrinking a Logical Volume
To shrink a logical volume, you can use the following command:
lvresize -L -<size> <logical_volume>
This command will decrease the size of the logical volume by the specified amount. For example, if you want to decrease the size of a logical volume named data by 5 gigabytes, you would use the following command:
lvresize -L -5G data
Options
The lvresize command has several options that can be used to modify its behavior. The following table lists all available options for this command:
| Option | Description |
|---|---|
| -l | Resize the logical volume by a specific number of extents |
| -L | Resize the logical volume to a specific size |
| -r | Resize the file system along with the logical volume |
| -t | Test the resize operation without actually performing it |
| -v | Verbose output |
Troubleshooting Tips
If you encounter issues when using the lvresize command, here are some tips to help you troubleshoot:
- Make sure that you have the necessary permissions to resize the logical volume.
- Ensure that the logical volume is not mounted before resizing it.
- Check that the file system on the logical volume is compatible with the resize operation you are performing.
Notes
- Always make a backup of your data before resizing a logical volume.
- When resizing a logical volume, it is important to ensure that there is enough free space on the physical volume to accommodate the new size.
- If you are unsure about the exact size to use when resizing a logical volume, you can use the
lvdisplaycommand to view information about the logical volume.