Linux › Section D · Disks and filesystems › Topic D.5
The Logical Volume Manager
Fixed partitions are hard to change once a system is in use. The Logical Volume Manager puts a flexible layer between disks and filesystems, so space can be pooled across disks and volumes can grow while mounted. Software RAID, its close neighbour, adds redundancy.
In this topic
- Why add another layer?
- PVs, VGs and LVs
- Looking at an LVM system
- Worked example: building a volume group
- Worked example: growing a mounted volume
- Shrinking, removing and snapshots
- How LVM works inside
- Software RAID with mdadm
- Usable RAID capacity
- Common mistakes to avoid
- Key takeaways
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