Datastore cluster contains datastores that belong to different SRM Consistency Groups.
A datastore cluster contains datastores that belong to different consistency group.
According to VMware DRS limitations, a datastore cluster must contain datastores that belong to only one consistency group. If you place datastores from different consistency groups to the same cluster, VMs may be lost during the recovery process.
Re-configure the datastore cluster to meet VMware DRS requirements.
Refer to VMware Online Documentation for more information about DRS.