UserVolumeConfig
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>.
block
Package block provides block device and volume configuration documents.
VolumeConfig
VolumeConfig is a system volume configuration document.
Note: at the moment, only EPHEMERAL and IMAGE-CACHE system volumes are supported.