Surveillance Test Tool
Version and / or Patch Used: 1.00
WD provided a test tool for measuring Command Competition Time (CCT). The tool shows the percent of commands completed in millisecond blocks of time. Ideally, you want all of your commands to complete in the least amount of time. Although we're showing both read and write tests on the chart, surveillance systems spend over 90 percent of the time writing data and less than 10 percent reading it back.
HD Tach - CCT 720P 8-Channels
HD Tach - CCT 720P 16-Channels
HD Tach - CCT 720P 32-Channels
It isn't until we reach the final test with 32 channels that we see a significant change in the chart. The change comes in the read performance where the single drive shifts the CCT to the 20 to 40ms range. In all of the tests, 99 percent of the writes occur in the 0 to 5ms period.
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