Disk Performance

To determine the actual disk performance, measure and record the physical I/O that occurs over a period of a time, then calculate the IOPS—that is, the total number of I/O operations that occur per second. Plot this value over time to determine requirements at peak usage. By understanding the IOPS that the application requires, IT can design the disk subsystem to provide the necessary performance for the running application.

Use Performance Monitor to measure the current application IOPS, as shown in Table 5. However, note that that measurement does not indicate whether the disk subsystem has a bottleneck. To see whether the system is disk-bound, look at the queue length of the physical disk. The queue length should be zero ...

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