5 Server configuration and managementServer configuration and management basically refers to two server types: ˇ Default server: e.g. the application manager or the report counting server. Their number cannot be extended or limited. ˇ Measurement servers: arbitrary number of them can exist and each of them must belong to a measurement server group. There are three types of measurement servers matching the types given for the measurement server groups: o Active and discoverable: the measurements are actively made by the PVSR application through the available API. The measurements supported by discoverable equipment can be discovered or queried through a suitable management protocol: e.g. the list of interfaces on networked equipment or the list of disk partitions on a UNIX server. These are discovered and automatically monitored by the PVSR (e.g. it automatically deletes them if the measurement has ended or the measurement name has changed). Even though the PVSR automatically searches the measurements in such a case, they can also be manually recorded like in the case of the active but not discoverable servers. If such a measurement is created, then subsequent automatic discovery will not happen. Accordingly, if the measured object is deleted from the active equipment, it will not disappear from the PVSR. This type of measurement will again be monitored automatically only if a new manual discovery is performed on the equipment through the web interface and it is saved afterwards. For certain discoverable servers there are measurement types (e.g. servers measuring IPSec) where no discovery is performed. o Active but non-discoverable: the measurements are actively made by the PVSR application through the available API, but it is not possible to discover and monitor the measurements of the equipment. This is typical when parameters need to be set for the measuring system in order to start the measurements (e.g. one or more WEB server addresses should be given to measure HTTP services) o Passive and optionally capable of auto discovery: the PVSR only collects files containing measurement values in certain defined formats, and optionally records and deletes the pieces of equipment and measurements based on the collected data 5.2.1 High Availability performance 5.8 Measurement result storage options 5.9 Server module operation cycles |