Answer:
The other criteria could be about the expected delay that is acceptable to customer in the processing time of the server.
Step-by-step explanation:
If the customers are ready to accept a certain delay then it can help making the decision whether to keep the server permanently on, as it consumes high power.
Also if it is not used all the time then keeping it on all the time would be wastage of resources.
Thus, the scheduling of the expected time at which they use, and the acceptable delay would provide a proper criteria for this.