SwapVolumeConfig is a disk swap volume configuration document.
Swap volume is automatically allocated as a partition on the specified disk
and activated as swap, removing a swap volume deactivates swap.
The partition label is automatically generated as s-<name>.
UserVolumeConfig is a user volume configuration document.
User volume is automatically allocated as a partition on the specified disk
and mounted under /var/mnt/<name>.
The partition label is automatically generated as u-<name>.
VolumeConfig is a system volume configuration document.
Note: at the moment, only EPHEMERAL and IMAGE-CACHE system volumes are supported.
ZswapConfig is a zswap (compressed memory) configuration document. When zswap is enabled, Linux kernel compresses pages that would otherwise be swapped out to disk. The compressed pages are stored in a memory pool, which is used to avoid writing to disk when the system is under memory pressure.