Configuration - Availability

There are two types of availability definitions: for an RRD or for an RRD on a particular host. The RRD may also be a wildcard RRD, like "df-*" or an instance of an RRD, like "df-/home". The definitions look like:

	rrd RRDNAME VARNAME CF RELATION THRESHOLD
and
	host HOSTNAME RRDNAME VARNAME CF RELATION THRESHOLD

The CF is one of LAST, MIN, MAX or AVERAGE, with rrdtool's usual meaning. The RELATION can be any one of: <, <=, >, >=, or =. The THRESHOLD is the number to which the value of VARNAME must be in the correct RELATION. (Clear as mud.)

As an example, take the following definition:

	rrd ping rcvd MINIMUM > 0

This means that the variable 'rcvd' in the ping rrd must be greater than zero for it to be considered "available". All time intervals where it isn't, or for which no data is available, are considered "unavailable".

There are also two other record types: colors and thresholds. A colors record looks like:

	colors COLOR1 ...

A thresholds line looks like:

	thresholds NUMBER ...

and must have the same number of values as the colors line. Only one of each. Here's an example to make the use clear (I hope):

	colors avail1 avail2 avail3 avail4
	thresholds 99 98 95 90