Which command creates a new volume group named vg_data using the device /dev/sdb1?

• A. pvcreate /dev/sdb1
• B. vgextend vg_data /dev/sdb1
• C. lvcreate -n lv_home vg_data /dev/sdb1
• D. vgcreate vg_data /dev/sdb1

Answer: (D)

In LVM, a volume group is created with the vgcreate command to define a new VG and include one or more physical volumes. Using vgcreate vg_data /dev/sdb1 creates a brand-new volume group named vg_data and adds /dev/sdb1 as its physical volume. Once the VG exists, you can then create logical volumes inside it with lvcreate.

Understanding the other options helps: pvcreate initializes a device as a physical volume but does not create a volume group by itself. vgextend adds one or more physical volumes to an existing volume group, not create a new one. lvcreate creates a logical volume inside an existing volume group. So the command that establishes a new volume group using the given device is vgcreate vg_data /dev/sdb1.