Reliable and Fault-Tolerant Storage Systems - Scalable Continuous Media Streaming Systems - page 103

Table 5.2 Parameters of five disk models

Quantum Quantum Seagate Seagate

Parameter Atlas-III Atlas-10K Barracuda Cheetah IBM 9ES

No. of tracks 8057 10042 5172 6581 11474

No. of surfaces 10 6 5 8 5

Fixed overhead 0 ms 0 ms 0 ms 0 ms 0 ms

Head-switching time 0.999 ms 0.176 ms 0.1 ms 0.195 ms 0.062 ms

Spinning speed 7200 rpm 10025 rpm 7200 rpm 10033 rpm 7200 rpm

Sector size 512 bytes 512 bytes 512 bytes 512 bytes 512 bytes

Max track size 256 sectors 334 sectors 186 sectors 195 sectors 390 sectors

Min track size 168 sectors 229 sectors 119 sectors 131 sectors 247 sectors

Disk capacity 9.1GB 9.1GB 2GB 4.5GB 9GB

Track-to-track seek 1.663 ms 1.245 ms 1.943 ms 0.636 ms 1.086 ms

Source : Ganger et al. [21]

600

400

200

0

0 0.2 0.4 0.6 0.8 1

Server Utilization

Quantum Atlas-III
Quantum Atlas-10K
Seagate Barracuda
Seagate Cheetah
IBM 9ES

Figure 5.9 Rebuild time versus server utilization for block-based rebuild ( Q = 64KB, N D = 5)