Add support for booting from file-backed disk
struanb opened this issue · 1 comments
Currently RunCVM boots from a virtiofs-mounted root filesystems, which is highly flexible and space-efficient and reasonably performant, but not as performant as a file-backed disk.
RunCVM supports mounting file-backed disks but not for the root filesystem.
If feasible, provide an option to enable this.
Worth noting that the latest RUNCVM_DISKS environment variable behaviour, which mounts a file-backed virtual disk populated with any pre-existing image contents at almost any desired filesystem location (except, currently, /) will provide much better VM disk performance in a range of scenarios where these can be effectively used.
For example, if the booted system is itself primarily running applications within Docker, mounting a single virtual disk at /var/lib/docker should be sufficient to deliver high disk performance.