Hitachi AMS2100 User Manual page 58

2-6
Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
- Collect this data over a 4-6 week period that includes high
peaks and spikes, and when the demands on the system are
greatest.
•
2. At the end of the period, convert the data to MB/second and
import into a spreadsheet tool.
data, in megabytes per second in 10 minute segments.
•
Figure 2-3: Raw Data Example in MB/sec
3. Using the copy frequency established earlier, calculate averages
over the collection period. Most spreadsheet tools have an
average function. For example:
If copy frequency is 1 hour, then calculate 60 minute rolling
averages using the values in 6 10-minute intervals.
If copy frequency is 4 hours, then calculate 240 minute rolling
averages using the values in 24 10-minute intervals.
Figure 2-4 illustrates 60-minute rolling averages.
Planning and design
Figure 2-3 shows collected raw