I will be updating this post as often as possible and updating the date so it will be the first post whenever I update it.
For those who are into know more on planning for DRS and Availability I would strongly encourage that you read about the VMware vSphere 5 Clustering technical deepdive.
Have datastore clean formatted as VMFS 5 datastores. This does not just helps but it will also put the load when perform any storage activities like Storage DRS, Storage vMotion to the storage subsystem if VAAI is supported. Having upgrade the datastore from VMFS 3, would still result in sub-block sizes especially if there are not formatted using 1MB blocksize which is standardize in vSphere 5. In such, the lod legacy datamover (FSDM) will be use which slow down such activities and making benefits from Storage DRS not as cost effect…