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measures, each one supported by a specific by Meter Agent. When a set of mea-
sures has been selected and the monitoring configuration is finished, the Cloud
Agency creates a new Meter Agent sends it to the target resource. At this point
the Meter Agent get the measures and sends them to the Archiver Agent, that
stores them and is able to compute metrics on performace information on user's
demand. Currently is possible to choose Host sFlow based measures.
Host sFlow
[1] agent measures and communicates physical and virtual server performance
parameters using the
sFlow
[2] protocol. The agent provides scalable, multi-
vendor, multi-OS performance monitoring with minimal impact on the systems
being monitored.
5.3 Cloud Performance Monitor
After that the application has been deployed. As regards the mOSAIC devel-
oper, he/she can take under control the infrastructure performances by using
the monitoring tool that can be started by the CA-GUI. It allows for the vi-
sualization of a list of available measures, as it is shown in Fig. 4 (a), or for
setting up the computation of some metrics about performance indexes. When
a new metric is created, the developer can read synchronously the last value of
that index or can create a trigger to be notified asynchronously according to
a specific time period or when a critical condition is verified as it is shown in
Fig. 4 (b). An example of available metric is the average value of a measure that
is periodically computed and that is notified when it is out of a certain range.
When a trigger is activated by the verification of a critical condition on a
resource's parameter, the user can decide to be notified about the verified event
or to activate/deactivate other rules previously defined and related to other
(a) Visualization of performance's
indexes
(b) Creating a trigger on a resource's
parameter
Fig. 4.
Monitoring Tool for Cloud Agency
