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Therefore, the total distance traversed by the disk arm and number of disk head movements have no direct correlation.
It also shows that both, BID-HDD and BID-Hybrid drastically reduce the total distance traversed by the disk arm.
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Figure 15 shows the disk arm movements incurred by all workloads.
The Storage simulator calculates the I/O access time (per I/O request) by HDDs considering the current location of the disk arm and time needed to reach the desired new location and access data size.
It is extremely imperative to reduce the disk arm movements in-order to avoid disk failures (also the risk of data loss).
BID schemes aim to exploit the inherent I/O sequentiality of Big Data applications to improve the overall I/O completion time by reducing the avoidable disk arm movements.
However, the relationship between distance traveled by disk arm and time taken is non-linear.
The data access time in HDDs is majorly governed by disk arm movements, which usually occurs when data is not accessed sequentially.
We use the terms "Disk Arm Movements" and "Disk Head Movements" interchangeably in this document.
This serves multi-fold, first maximal sequentiality in HDD is ensured, i.e. preventing the avoidable disk arm movements (interruptions).
This is due to the nature of distribution of disk arm movement distances.
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