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A Beginner's Guide to LVM in Linux - tchncs
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this post was submitted on 11 Mar 2024
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Are there like any use-cases for it other than "well, I can add another drive to extend partitions whenever I want"? 'Cuz that's how it's often described (if at all*), and it doesn't really make much sense to me. Like, if I install on a laptop, it'll most often have just one drive, so lvm seems unnecessary, and if I make some server-like setup with multiple drives, I'd go with some kind of raid with redundancy instead of just stitching the drives together (or mb yolo and raid 0).
* If I remember correctly, arch wiki for example, had it used in the partitioning guide for dm-crypt without explaining the benefits against just
luksformating/It still has use with a single drive. Being able to resize any partitions you create is useful. Snapshots as well. Particularly if you're using multiple file systems or file systems that don't support some kind of subvolumes. You can run it on a md RAID if you want as well.
Server setups are usually virtual machines nowadays, with virtual disks (i.e. vmdk or qcow2 files in a storage pool). Stitching virtual disks together is valid in this case because redundancy is handled on another level, invisible to the vm.
LVM allows online resizing of volumes, and includes redundancy features such as snapshots and raid.
It's used a lot more in services than laptops.