Which command is used to create a physical volume in a Linux system?

The command used to create a physical volume in a Linux system is pvcreate. This command initializes a designated block device for use in LVM (Logical Volume Manager) by marking it as a physical volume. When you run pvcreate, it prepares the block device so it can be added to a volume group, facilitating the management of logical volumes on that device.

In the context of LVM, pvcreate plays a crucial role because physical volumes form the foundation upon which volume groups and subsequent logical volumes are built. Once the physical volume is created, it can then be included in volume groups using commands like vgcreate.

The other options represent different commands related to LVM. lvcreate is used to create logical volumes from a volume group, while vgcreate is designed to create a new volume group from one or more physical volumes. xfs_admin is unrelated to LVM; instead, it is a command that manages XFS file systems. Thus, pvcreate is the correct command related to the creation of a physical volume in this context.