DRS-enabled storage
You can automate the management of all of your datastore cluster resources using the Storage DRS. In a datastore cluster, a Storage DRS generates recommendations for migrating and placing the disks of your virtual machines to different datastores based on the availability of I/O resources and free space. DRS-enabled storage automates the load balancing of space across different datastores of a cluster. It also does the load balancing of I/O load of a virtual machine's disks and places their disks accordingly to satisfy their I/O needs.
Failed DRS recommendations
When automated, Storage DRS tries to implement the recommendations for low space or I/O load balancing; but sometimes it doesn't work and fails to apply recommendations. There could be multiple issues causing this problem that does not allow Storage DRS to apply the recommendations. You can check all the alarms that have been triggered recently. Sometimes, there is no space available in datastores to accommodate...
