Already (mostly) done: https://www.mediawiki.org/wiki/Wikimedia_Release_Engineering_Team/Staging_Cluster
T1000! (sorry, I could not stop myself)
See https://www.mediawiki.org/wiki/Wikimedia_Release_Engineering_Team/Quarterly_review,_January_2015#What.27s_Next_.28Priorities.29
Also: https://www.mediawiki.org/wiki/Beta_cluster/2014-15-Q3
Specifically: