In this lesson, you will learn how to combine storage devices with different hardware architectures into a single, seamless logical volume using LVM.
Bridging Hardware Differences
Up until now, you have managed storage by adding drives to a Volume Group (VG) and creating Logical Volumes (LVs) on top. A powerful feature of this abstraction is that LVM does not care about the underlying "personality" of your hardware. You can mix and match devices with different architectures, connection types, and performance profiles—such as an old spinning SATA hard drive, an ultra-fast NVMe SSD, and even a network-attached block device—into a single pool of storage.
Because LVM treats every device as a collection of identical "Physical Extents," the kernel sees the resulting Logical Volume as one contiguous block device, regardless of whether the data is physically sitting on an expensive fiber-channel array or a budget USB drive.
Practical Implementation
To demonstrate this, imagine you have a Volume Group named vg_hybrid that contains both a high-speed SSD (/dev/nvme0n1) and a large, slower HDD (/dev/sda). When you extend a logical volume across these, LVM masks the hardware differences:
# Add both devices to the same Volume Group
vgcreate vg_hybrid /dev/nvme0n1 /dev/sda
# Create a large volume that spans both devices
lvcreate -n data_vol -L 2T vg_hybrid
Once the volume is created, you treat it like any other disk. You can format it with a filesystem like ext4 or xfs and mount it normally. The Linux kernel handles the heavy lifting of mapping your file read/write requests to the correct physical location, hiding the fact that the underlying storage is architecturally diverse.
This approach allows you to scale your storage capacity using whatever hardware you have available at the moment, rather than being forced to buy identical drives to match your existing equipment. While performance will be limited by the slowest device in the pool, the architectural flexibility is an invaluable tool for storage management.
Key Takeaway: LVM abstracts physical hardware differences, allowing you to pool heterogeneous storage devices into a single, unified logical volume that the operating system perceives as one cohesive drive.