Introduction
Logical Volume Management (LVM) is a powerful tool in the world of Linux systems administration that allows for flexible management of disk space. One common task that system administrators may need to perform is extending logical volumes to accommodate growing storage needs. In this article, we will explore how to extend logical volumes using the 'lvextend' command, with detailed examples for various use cases.
Extend LVM to Fill Disk
One of the most common reasons for extending logical volumes is to fill up the available disk space. To extend a logical volume to fill up the entire disk, you can use the following command:
lvextend -l +100%FREE /dev/mapper/vg-lv
In this command, the '-l +100%FREE' option instructs 'lvextend' to extend the logical volume to use all available free space in the volume group. Make sure to replace '/dev/mapper/vg-lv' with the actual path to your logical volume.
LVM Extend Filesystem
After extending a logical volume, you may also need to extend the underlying filesystem to make use of the additional space. The following example demonstrates how to extend both the logical volume and the filesystem:
lvextend -l +100%FREE /dev/mapper/vg-lv
resize2fs /dev/mapper/vg-lv
In this example, 'resize2fs' is used to resize the ext4 filesystem on the logical volume '/dev/mapper/vg-lv' to match the new size of the logical volume.
Extend LVM Linux
Extending logical volumes on a Linux system involves a series of steps that require careful attention to avoid data loss. To extend a logical volume on a Linux system, follow these steps:
1. Identify the logical volume you want to extend using the 'lvdisplay' command.
2. Use 'lvextend' to increase the size of the logical volume.
3. Resize the filesystem to make use of the additional space using the appropriate filesystem-specific tool (e.g., 'resize2fs' for ext4 filesystems).
LVM Extend Physical Volume
Extending a physical volume in LVM is a common operation when you need to increase the available storage capacity on your system. To extend a physical volume, follow these steps:
1. Identify the physical volume you want to extend using the 'pvdisplay' command.
2. Use the 'pvresize' command to extend the physical volume to use all available space on the underlying disk.
LVM Extend PV
Extending a physical volume in an LVM setup can be done using the 'pvresize' command. Here is an example of how to extend a physical volume:
pvresize /dev/sdb1
In this example, '/dev/sdb1' is the physical volume that you want to extend.
Extend LVM CentOS 7
CentOS 7, being a popular Linux distribution, often requires extending logical volumes to accommodate growing storage needs. To extend a logical volume on CentOS 7, follow the steps outlined in the previous sections, tailored to the CentOS 7 environment.
Extend VG LVM
Extending a volume group in LVM is a straightforward process that involves adding physical volumes to the existing volume group. To extend a volume group, follow these steps:
1. Identify the volume group you want to extend using the 'vgdisplay' command.
2. Use the 'vgextend' command to add a physical volume to the volume group.
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