This guide assumes you have created a Rook cluster as explained in the main Quickstart guide
Rook allows creation of Ceph Filesystem SubVolumeGroups through the custom resource definitions (CRDs). Filesystem subvolume groups are an abstraction for a directory level higher than Filesystem subvolumes to effect policies (e.g., File layouts) across a set of subvolumes. For more information about CephFS volume, subvolumegroup and subvolume refer to the Ceph docs.
To get you started, here is a simple example of a CRD to create a subvolumegroup on the CephFilesystem "myfs".
If any setting is unspecified, a suitable default will be used automatically.
name: The name that will be used for the Ceph Filesystem subvolume group.
filesystemName: The metadata name of the CephFilesystem CR where the subvolume group will be created.