dropped significantly, the capacity increased, and the speed of access decreased. Disk
storage was a superior alternative to magnetic tape files.
Fig. 8.1.5 shows the symbol for disk storage.
Fig. 8.1.5 Disk storage.The demand for volumes of data increased dramatically. In short order, it was necessary
to manage disk storage in a parallel manner. By managing disk storage in a parallel
manner, the total amount of data that could be controlled increased significantly. Parallel
management of storage did not increase the volume of data that could be managed on a
single disk. Instead, parallel storage of data decreased the total elapsed time that was
required to access and to manage storage.
Fig. 8.1.6 shows the symbol for parallel management of storage.
Fig. 8.1.6 Parallel disk storage.Yet, another increase in the volume of data that could be managed on disk arrived in the
form of big data. Big data was really just another form of parallelism. But with big data,
even more data could be managed at an increasingly lower unit cost.
Chapter 8.1: A Brief History of Data Architecture