Missing Data Within Rrd Database Files; Empty Historical Report States 3Com Network Director Cannot Monitor Device/Link - 3Com 3C15500 - Network Director User Manual

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4 Using your favorite text editor open the System.properties file
located within this subdirectory.
5 Add (or if the entry already exists, update) the file to include:
options.logging.loggingDir=<NewLoggingDataDirectory>
Where <NewLoggingDataDirectory> is the new location where you want
logging data to be stored.
Note that the ":" and "\" characters must be escaped (i.e. preceded) with
a "\" character in the System.properties file. For example, to set the
logging directory to D:\Data\Logging you would need to update the file
to include:
options.logging.loggingDir=D\:\\Data\\Logging
To retain any existing data copy the current contents of your logging
directory to this new directory. To facilitate a new log leave it empty. If the
directory does not exist, 3Com Network Director will create it.

Missing data within RRD database files

An RRDTool database may contain the value UNKN. This indicates missing
data. There are several reasons why this might happen:
You may not have been monitoring the device/link in question at the
time.
The monitor corresponding to that data source may not be a valid
monitor for the device or link. For example, if a monitored end station
does not have an FTP server running on it, the data source for FTP will
never record any data.
3Com Network Director may use data gathered using RMON or MIB-II
datasources depending on the capabilities of devices at either end of
the link. Sometimes RMON does not give the same breadth of values
as MIB-II, and vice versa. The values used on the same link can change
over time, if one end of the link changes, or becomes unavailable, and
the data source is changed.
Empty historical report states 3Com Network Director cannot
monitor device/link
Sometimes if you attempt to launch a historical report against a device, or
link, the launched report will contain only the statement:
3Com Network Director cannot monitor <name of device or link>
so there is nothing to report.