Greetings! When using btrfs with multiple devices in a "single" mode, is it possible to force some files and directories onto one drive and some to the other? Or at least specify "single" mode on a specific device for some directories and "DUP" for some others.
The following scenario, if it is possible, would make btrfs even cooler than bcachefs: - Single mode, multiple devices - a HDD and a SSD - Force system folders to be located on the SSD, or both - those have little writes and need speed - And still manage snapshots easily on one place, instead of two top-level directories and a lot of symlinks! Maybe it is at least possible to do it on a per-subvolume basis? This would still be better than mounting subvolumes from different devices. I remember reading somewhere in the early days of btrfs that the main advantage on btrfs over LVM is that btrfs knows about your files, which makes those things possible - even on a file structure level. However, I could not find anything about it, while LVM allows per-volume physical location settings, if I remember correctly. -- Valery Plotnikov
