Example of calculating for unstructured data files

A company runs 1000 jobs every day on a single system, and each job generates around 4000 lines of SYSOUT data. Most lines are 80 characters long. Restart and cleanup actions are taken almost immediately if a job fails, and so it is not necessary to keep records in the data store for more than 1 day.

A decision is made to spread the data over 10 files. The maximum number of logs stored at a given time 1 is: 1000 * 1 = 1000. As each log is about 4000 lines long, and each line is about 80 characters long, the number of bytes of space required for each is: 4000 * 80 = 320,000 Thus, the total number of bytes of space required is: 320,000 * 1000 = 320,000,000

If 4 files were used, each file would hold the following number of bytes of data: 320,000,000 / 4 = 80,000,000.

If 3390 DASD was used, each file would require this number of tracks: 80,000,000 / 56664 = 1412 or this number of cylinders: 80,000,000 / 849960 = 94