How can we measure the cloud-based services?

In acloud-computing environment we pay for theservices that we use. So main criteriato measureacloud based serviceits usage.

Forcomputing resource we measure by usagein terms oftimeand the power ofcomputing resource.

Forastorageresource we measure by usagein terms of bytes (giga bytes)and bandwidth used in datatransfer.

Another importantaspect ofmeasuring acloud serviceis itsavailability. Acloud provider has to specify theservicelevelagreement (SLA) for the
timefor which service will beavailablein cloud.