Cost-effective data transfer for data creation and data recovery - Reliability Assurance of Big Data in the Cloud - page 68

Figure 7.3 Pipeline agenda model
7.2.3 Pipeline agenda model
Figure 7.3 shows the pipeline agenda model. From the pipeline agenda, the existing
bandwidth schedule of the pipeline can be clearly seen. In this model, we call the
period a timeslot , where the available bandwidth and link rate remain the same. A
timeslot can be denoted as TS ( t i ) in which t i is the start time of the timeslot. The length
of each timeslot depends on the existing bandwidth schedule on the pipeline. For ex-
ample, in TS ( t 2 ), both the link rate and available bandwidth drop to 0, which indicates
a shutdown period. During a shutdown period, one router or both routers connected to
the pipeline are shut down. The beginning or the end of each timeslot is called an event
E ( t i ) indicating that the status of the pipeline is about to change.
7.2.4 Overall agenda model
Figure 7.4 shows the overall agenda model of the data transfer link. The overall agenda
of the link is created by collecting all the pipeline agendas on the link. Based on the
overall agenda, bandwidth scheduling for the entire data transfer link can be conducted.
The format of the overall agenda model is similar to the pipeline agenda model except:
Figure 7.4 Overall agenda model