What command groups physical volumes into a volume group?

The command that groups physical volumes into a volume group is vgcreate. This command is a part of the Logical Volume Manager (LVM) system in Linux, which allows for improved management of disk partitions and storage.

When using vgcreate, you specify the name of the volume group you want to create, along with one or more physical volumes that you have already set up using pvcreate. This process effectively creates an abstraction layer over the physical storage, enabling you to manage storage more flexibly—adding or resizing physical volumes and logical volumes within the volume group as needed.

The grouping of physical volumes into a volume group allows for features like snapshots, striping, and spanning logical volumes across multiple physical volumes, which enhances storage management and efficiency.