How to create a logical volume in CentOS 7

You can create a logical volume on CentOS 7 by following these steps:

1. Ensure that there are available physical volumes on the system. Use the command “sudo pvs” to view the list of physical volumes.
2. Create a volume group using the command sudo vgcreate . For example, sudo vgcreate myvg /dev/sdb1 will create a volume group named myvg, using /dev/sdb1 as the physical volume.
3. Creating a logical volume. You can use the command sudo lvcreate -L -n to create a logical volume. For example, sudo lvcreate -L 10G -n mylv myvg will create a logical volume with a size of 10GB, named mylv, using the myvg volume group.
4. Format the logical volume. You can use the command sudo mkfs. /dev// to format the logical volume. For example, sudo mkfs.ext4 /dev/myvg/mylv will format the logical volume using the ext4 file system.
5. Mount the logical volume. You can create a directory and then use the command “sudo mount /dev// ” to mount the logical volume. For example, “sudo mount /dev/myvg/mylv /mnt/mylv” will mount the logical volume to the /mnt/mylv directory.
6. (Optional) Set up automatic mounting at startup. You can edit the /etc/fstab file and add the mount information for the logical volume to the file. For example, add the following line to the /etc/fstab file:
7. The /dev/myvg/mylv partition is mounted at /mnt/mylv with ext4 file system and default settings, and configured to be automatically mounted on boot.
8. This way, the logical volume will be automatically mounted to the specified mount point each time the system starts up.

The above are the basic steps to create a logical volume on CentOS 7. Additional configuration and adjustments may be required depending on actual needs. Please ensure to backup important data before performing any operations and proceed with caution.