18.4.1 Checking and Recovery: An Efficiency
of Implementation
As mentioned previously, checking and recovery actions might be scheduled
independently from the other processes inside the DCS; see Fig. 18.8.
In addition, Fig. 18.8 shows an example of mission reliability function for
networked systems where periodic preventive maintenance is done but the coverage
of checking is not complete.
Real-time online checking and recovery should be part of the monitoring process. As mentioned previously online checking is a process executed in real-time
where the main elements in the system are checked in real-time. This includes
hardware (vertices and edges) and software. The main goal of online checking is
detection of changes in behavior or degradation, and if necessary recovery of the
suspected element(s). This will certainly improve the system’s mission reliability,
performance, and availability.
Again, is worth to emphasize that is very important to carry out checking and
preventive maintenance well in advance in order to provide the networked system
with highest mission reliability in real-time. The mission reliability function for
DCS and other networked systems with real-time maintenance needs to be calculated with realistic assumption about coverage of real-time maintenance is limited,
so coverage is a100 as it was described in [3–5] and further elaborated in [14].
Fig. 18.8 Periodic maintenance initiated for DCS within complete coverage
18.4 Recoverability Costs
265
of Implementation
As mentioned previously, checking and recovery actions might be scheduled
independently from the other processes inside the DCS; see Fig. 18.8.
In addition, Fig. 18.8 shows an example of mission reliability function for
networked systems where periodic preventive maintenance is done but the coverage
of checking is not complete.
Real-time online checking and recovery should be part of the monitoring process. As mentioned previously online checking is a process executed in real-time
where the main elements in the system are checked in real-time. This includes
hardware (vertices and edges) and software. The main goal of online checking is
detection of changes in behavior or degradation, and if necessary recovery of the
suspected element(s). This will certainly improve the system’s mission reliability,
performance, and availability.
Again, is worth to emphasize that is very important to carry out checking and
preventive maintenance well in advance in order to provide the networked system
with highest mission reliability in real-time. The mission reliability function for
DCS and other networked systems with real-time maintenance needs to be calculated with realistic assumption about coverage of real-time maintenance is limited,
so coverage is a100 as it was described in [3–5] and further elaborated in [14].
Fig. 18.8 Periodic maintenance initiated for DCS within complete coverage
18.4 Recoverability Costs
265