The minimum permissions for the Cluster Service account are:
Lock Pages in memory
Log on as a service
Act as part of the OS
Back up files and directorises
Increase quotas
Increase scheduling priority
Load and unload device drivers
Restore files and directories
The easiest way to do this is Give the cluster service and sql service
accounts local admin rights then add the following permissions:
Lock pages in memory
log on as a service
act as part of the OS