What do you want in your stack?

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Because Linux is modular, a lot of functionality is duplicated by various components. For example, modern filesystems try and be all things to all men, while other components such as Device Manager and md-raid are more single-function components.

Which component provides what
Component Combine Devices Redundancy Snapshots
Raid Yes Yes No
LVM Yes No Yes
Btrfs Yes Yes Yes

Looking at the table, and seeing that btrfs provides all three capabilities, you might wonder why you want to bother with raid and lvm - why not just use btrfs, or another modern filesystem.

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