Development, Network, Security, Ideas & Opinions
Logical Volume Manager 2 ( lvm2 ) is a very powerful toolset to manage physical storage devices and logical volumes. I’ve been using that instead of disk partitions for over a decade now. LVM gives you full control where logical volumes are placed, and a ton of other features I have not even tried out yet. It can provide software RAID, it can provide error correction, you can move around logical volumes while they are being actively used. In short, LVM is an awesome tool that should be in every Linux-admin’
Today I want to show how I used LVM’s cache volume feature to drastically speed up a Btrfs RAID1 situated on two slow desktop HDDs, using two cheap SSDs also attached to the same computer, while still maintaining reasonable error resilience against single failing devices.