SummaryIn the Exinda, there are many time ranges that can be examined when looking at graphs, and it is possible to see slight discrepancies between the data on these different graphs, though they should be appearing the same.
OverviewTime ranges for various reporting metrics can be useful to view, in order to examine trends and other information as they occur over time. In general, slight discrepancies can be seen between graphs in different time ranges as those time ranges get farther apart. This is due to the fact that the Exinda takes samples of the data going through it at certain intervals. When viewing this information in a graph using a time range, samples are averaged out over that range. The Exinda takes samples every 5 minutes; as a result, the 'past 5 minute' time range is the most accurate in terms of up to date data, but recent information up to 'the past 7 days' uses every five minute sample.
However, storing all the five minute samples over time for long periods of time in the database will cause the size requirements to inflate massively (one sample every five minutes is 12 samples an hour, 288 a day, 2016 a week...etc). As a result, there's a concept called 'granularity' that comes into play. As time goes on, some older samples from the database are dropped in order to save space. As a result, for graphs that have a large time frame have fewer samples averaged over a larger timespan. This will as a result, show a less accurate moment-to-moment graph for specific times, but it will show an overall trend.
The amount of data that is used:
- 2 years of data - this year, previous year & last 12 months
- 2 months of data - this month, previous month & last 30 days
- 2 weeks of data - this week, previous week & last 7 days
- 2 days of data - today, yesterday & last 24 hours
- 1 day of data - this hour, last hour & last 60 minutes, last 5 minutes
For the Applications, URLs, Users, Hosts, Conversations and Subnets Reports, the data is stored at the following granularities:
- Hourly granularity for up to 2 days (today, yesterday, this hour, previous hour)
- Daily granularity for up to 2 months (this week, last week, this month and last month)
- Monthly granularity for up to 2 years (this year, last year)
For the Interface, Network, Reduction, Optimizer, Service Levels, System the data is stored at the following granularities:
- 10 second granularity for 1 day (except Network)
- 5 minute granularity for 2 weeks
- 30 minute granularity for 2 months
- 60 minute granularity for 6 months
- 24 hour granularity for 2 years