OVERTIME for IBM NetView
USER GUIDE
Over View:
OverTime is an application that combines the power and
convenience of IBM NetView's data collection facilities and user
interface with the graphical trending database facilities of Tobi
Oetiker's RRDTool.
From a menu item within NetView, OverTime takes a user
selected device from the IBM NetView's map and
1) Decides what statistical information can be collected from the
device to depict utilisation levels
2) Gathers these details directly from the device.
3) Configures IBM NetView to collect the information from the
device.
4) Configures RRDTool databases to store the collected
statistics.
5) Updates an HTML page so that the device's statistics can be
viewed.
When the user selects the device on the HTML page via a
browser, OverTime
1) Updates the RRDTool database from the information collected by
IBM NetView.
2) Generates the appropriate graphic images for the statistics
gathered for this device.
3) Generates an HTML page for the web server to display. (The
same display can also be generated from the command line so that
it may be relocated to a different server for later display.)
Three other NetView menu items allow you to
OverTime provides routines that, when run regularly
1) update all the RRDTool databases from the IBM NetView
collected information and
2) prevents the IBM NetView collected
information from growing until all available disk space is
consumed.
RRDTool databases are fixed size, not growing due to their
Round Robin technology. As new information is added to the
database it is placed into a fixed size table. This table is then
consolidated into another table covering a longer period, but
with less granularity. This table in turn is consolidated into a
third and finally into a fourth table. The oldest information in
each table is replaced by the newest. The tables typically cover
from 30 hours with a 5-minute spacing to over a year on a daily
spacing.