Brocade Fabric Manager Administrator's Guide (53-10000196-01-HP, November 2006)

Fabric Manager Administrator’s Guide 8-3
Publication Number: 53-1000196-01-HP
Performance Monitoring Components
8
Granularity
Granularity is the timeframe for the sample values that are used to generate a report. Since Fabric
Manager stores a limited number of samples for each granularity, every level of granularity is not
available for all possible time ranges. For example, if you select a timeframe to be the past three days,
the five-minute granularity level is not available. The options for granularity (for both Port Statistics
and End-to-End Monitoring) are listed in Table 8-1.
There might be gaps in the stored data. Events that can cause gaps in data include:
• Authentication failures
Fabric Manager uses switch user names and passwords to store data. If the password is changed
(resulting in an authentication failure) on a switch where performance monitoring is enabled, data
collection fails (creating a gap in the stored data).
• Switch not reachable
Data is not gathered if the seed switch is unreachable. If the seed switch is reachable, but additional
switches in the fabric are unreachable by Ethernet, the data is gathered.
• Performance monitoring is not enabled
Data is not being gathered, causing a gap in the stored data.
Reports
Fabric Manager allows you to present information in two forms: reports and graphs. In Fabric Manager,
you can create customized reports, or you can create reports from templates. You can also save, print,
and export reports created in Fabric Manager. See the following sections for more information:
• “Creating Custom Reports” on page 8-8
• “Creating and Using Report Templates” on page 8-13
• “Saving Performance Monitor Reports or Graphs” on page 8-17
• “Printing Performance Monitor Reports” on page 8-17
• “Exporting Reports” on page 8-18
Table 8-1 Stored Samples (per Fabric) for Granularity Options
Granularity Samples Time Covered in Stored Samples
5 minutes 600 2 days and 2 hours
30 minutes 700 2 days and 2 hours, plus 12.5 days
2 hours 775 2 days and 2 hours, plus 12.5 days, plus 50 days
1 day 797 2 days and 2 hours, plus 12.5 days, plus 50 days, plus 732 days (rounded
to 797 days)
Note
If data is not available for some of the granularity points when values are rolled up to the next time
period value, the missing data is ignored. For example, if five of six 5-minute values are 50, and the sixth
value is missing: N1= 50, N2= 50, N3=50, N4= 50, N5= 50, N6= NA. The rolled up value for 30-minute
entry=250 (because the N6 value is calculated as if it is a value of zero).