In LVM terminology, which object is created directly on a partition or whole disk so that its storage can be added to a pool?
LPIC-1 Exam 101-500, objective 102. Linux installation and package management medium
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The options
Not correct Physical extent (PE)
Wrong. A physical extent is the fixed-size allocation unit a volume group divides its physical volumes into; it is an internal unit, not something you create on a disk.
Not correct Volume group (VG)
Wrong. A volume group is the pool built from one or more physical volumes with vgcreate. It is not created on a partition directly.
Not correct Logical volume (LV)
Wrong. A logical volume is carved out of a volume group with lvcreate and is the block device you actually put a filesystem on.
Correct Physical volume (PV)
Correct. pvcreate labels a partition or whole disk as a physical volume; PVs are then grouped into a volume group.
Why
The LVM stack runs bottom-up: pvcreate makes physical volumes out of partitions or disks, vgcreate pools PVs into a volume group, lvcreate carves logical volumes out of that group, and you then run mkfs on the logical volume. Space is allocated in physical extents, which is why a VG's capacity is always a whole number of extents.
Where this comes from
- Cited
- LPI exam objective 102.1
- What it says
- Awareness of basic features of LVM: physical volumes, volume groups and logical volumes.
Practise this
Reading one question is not practice. The trainer will draw a set from objective 102 and space the ones you get wrong.