Efficient Server Design for Hybrid Multicast Streaming - Scalable Continuous Media Streaming Systems - page 364

System parameter Symbol Value

Video data rate R V 4Mb/s (MPEG2)

Number of disk N 8

Length of video L 7200s

Static channel per video N S 20

Dynamic channel per video N D 20

Table 20.2 Specification of different disks used in performance evaluation

Disk Parameter Value

Disk Model Atlas 10K Barracuda Cheetah 9LP IBM 18es

Disk rotation speed (rpm) 10,025 7,200 10.045 7200

Full strobe seek time (ms) 10.828 16.679 10.627 12.742

Track-to-track seek time (ms) 1.245 1.943 0.831 1.086

Head switching time (ms) 0.176 0.100 0.030 0.062

Number of data surfaces 6 5 12 5

Blocks per disk 17,938,986 4,110,000 17,783,240 17,916,240

Total number of tracks 10,022 5,172 6,962 11,474

Number of zones 24 11 11 55

Data in cache

NCQ (1 + 1/ G )

NCQ

3NCQ/G
2NCQ/G
NCQ/G

Time

micro-round micro-round

service round service round

Transmission

Figure 20.8 Server buffer requirement when micro-rounds are of same durations (G = 4)