H3C Technologies H3C Intelligent Management Center - Manual (Page 744)

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• Daily data—At 00:00 every day, IMC takes the sum of the hourly data collected the last day as
the daily data.
If you query the history data of the last 3 days, IMC reads the raw data. If you query the history data
of the last week, IMC reads the hourly data. If you query the history data of a long period, for
example, the last month, IMC reads the daily data.
Therefore, the following issues might occur:
• The bandwidth statistics at the same hour of the last week and the last 3 days are different. This
is because the maximum bandwidth of each AP occurs at different time. The data at a specific
time is the sum of the raw data of each AP in the statistics of the last 3 days, while the sum of
the hourly data of each AP in the statistics of the last week. Sometimes the bandwidth at a
specific hour within the last week is greater than the bandwidth at the hour within the last 3 days
because the hourly data is always the maximum value of the raw data collected within the last
hour.
• The sum of the traffic of the last day is greater than the sum of the traffic of the last week. This is
because no hourly data is generated within the last hour. The sum of the traffic of the last day
contains the traffic of the last hour, while the sum of the traffic of the last week does not, so if
IMC is deployed less than a week, and the traffic of the last hour is big, the sum of the traffic of
the last day is greater than the sum of the traffic of the last week.
• The sum of the traffic of the last week is greater than the sum of the traffic of the last month. This
is because no daily data is generated within the last day. The sum of the traffic of the last week
contains the traffic of the last day, while the sum of the traffic of the last month does not, so if
IMC is deployed less than a month, and the traffic of the last day is big, the sum of the traffic of
the last week is greater than the sum of the traffic of the last month.