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Hard Disk Performance, DAS - Coggle Diagram
Hard Disk
Performance
Disk Service Time (Ts)
Seek Time (T)
Full Stroke
Average
Track-to-track
Rotational Latency (L)
Data Transfer Time
External Transfer Time
Internal TransferTime (X) = Block Size / Internal Transfer Rate
Utilization
Response Time
Arrival Rate
Queue Size
Processing Time
Avg.Response Time = Service Time / (1 - Utilization )
DAS
Benefits
Lower Initial Cost
Simple Configuration
Easy & Rapid Deployment
Managed by Server OS
Internal DAS
Limited Distance
Limited Devices
Space Utilization
Limitations
Limited Scalability
Limited Number of Hosts
Poor Resource Utilization
External DAS
SCSI
FC
