Storage DRS, Storage/Network I/O Control, Profile-driven storage

Storage DRS

helps balance storage capacity and performance across a cluster of datastores
Includes choosing the best datastore when placing a new VM
Also includes storage vMotion to reblance storage resource utilization dynamically

Storage I/O Control and Network I/O Control

allows admins to assign relative priority to storage I/O and limit storage I/O.
Settings are enforced cluster-wide
Works for VMFS and NFS datastores in 5.0 (4.1 included only VMFS datastores)
Similarly, network I/O has extensive controls so admins can ensure that VMs that need priority access to network resources get the resources they need

Profile-Driven Storage

New to vSphere 5
storage profiles ensure that VMs are residing on storage that can provide the capacity, performance, availability, and redundancy they require.
Key components:

1. Storage capabilities, leveraging vSphere's storage awareness APIs
2. VM storage profiles

some arrays can provide their own storage capabilities to vSphere using the APIs
admins can provide the storage capabilities as well
profiles are created that specify the storage capabilities that must be present in order for the VM to run.