Frequency and Retention
of Statistics Collection in the
The
collects statistics from the guest operating system at
regular intervals and stores them in a database. Users can query the statistics
in the database by selecting a time period and a roll-up function that the
appliance applies to the statistics before returning them to the client.
After the appliance monitoring
service starts up, it begins requesting statistics from the guest operating
system periodically, at a frequency that depends on the type of statistic. The
service requests storage statistics once every 10 minutes, while it requests
memory, CPU, and networking statistics once per minute. The collection times
are fixed relative to the startup time of the monitoring service, rather than
to clock time.
The monitoring service retains
statistics approximately 13 months, by default. Older statistics are deleted by
the service, creating a 13-month moving window within which you can query
statistics. You can choose to delete statistics as needed to conserve storage
resources.