Strategies for Datacenters Participating in Demand Response by Two-Stage Decisions

Table 1

Parameter notations.

Symbol	Description
N	The number of hosts in datacenters
	The number of time slots
	The electricity price at time slot t
	The revenue of a task executed by the datacenter
	Basic power consumption
	The actual power consumption reduction
	The execution rate when participating in DR
	The reward is given to datacenters by the grid at time slot t
	The penalty of violating the QoS of task i
	The execution time of a task
	The submission time of a task
	The penalty factor
	The power consumption of host n at time slot t
	The maximum power consumption of host n
c	The percentage of static power consumption
Un,t	The CPU utilization of host n at time slot t
	The total power consumption of datacenter at time slot t
Et	The total energy consumption of datacenter at time slot t
	The number of interactive tasks submitted at time slot t by user u
	The number of batch-type tasks submitted at time slot t by user u
	The number of tasks from user u that can be delayed to process from time t to
	The charge resulted from postponing the execution of some tasks from user u at time slot t
xu,t	A binary variable indicating user u is selected or not at time slot t
	The number of batch-type tasks executed at time t
	The total number of tasks needed to be processed at time slot t
	The number of tasks that violate QoS at time slot t
ruser(t)	The reward given to the users by the datacenter at time slot t