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Figure 23 – Windows 2000 Multiple IDE disk random IOs per second: RAID0 vs. peak IOs per second
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| bet | 32/47 | | Sana | 30.03.2021 | | Hajmi | 1,33 Mb. | | #13789 |
Figure 23 – Windows 2000 Multiple IDE disk random IOs per second: RAID0 vs. peak IOs per second. The graph on the left shows the peak number of IOs per second available in a two disk system. We measured peak number of IOs per second by issuing requests to each of the disks individually, ensuring that the workload was split evenly between the two disks. The request depth shown on the left graph is per disk. The right graph shows the IOs per second achieved with the two disks in a RAID0 stripe set. The request depth shown is total number of outstanding requests, not per disk. RAID0 shows lower IOs per second than the peak IO rate. This is due to the fact that the workload is not evenly split evenly between the two disks. For two deep requests, there is a 50% chance that both IOs will go to the same drive, leaving the other drive idle. When both requests go to a single disk, we lose the parallelism of having that second disk which reduces our overall number of IOs per second.
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