3
Availability
0
Dummy
MTBF (hours)
4
0
60
30
0
0
0
0
0
0
return GetCustomAttribute($node, "mtbf");
Dummy
Failures
0
0
60
30
0
0
0
0
0
0
return GetCustomAttribute($node, "NumFailures");
Dummy
Node availability (percentage)
4
0
60
30
0
0
0
0
0
0
// This script calculates MTTR, MTBF and perAvailability parameters and stores them in custom attributes
// Initialize some custom attributes the first time.
// Undefined attributes are created by SetCustomAttribute function automatically
CurrentStatus = GetDCIValue($node, FindDCIByName($node, "Status"));
PreviousState = GetCustomAttribute($node, "PreviousState");
if (PreviousState == null)
{ // In the first time, previous state is null
SetCustomAttribute($node, "PreviousState", CurrentStatus);
SetCustomAttribute($node, "TimeStamp", time());
SetCustomAttribute($node, "NumFailures", 0);
SetCustomAttribute($node, "TotalUptime", 0);
SetCustomAttribute($node, "TotalDowntime", 0);
return 100;
}
// From here the 2nd and subsequent times
NumFailures = GetCustomAttribute($node, "NumFailures");
LastTime = time() - GetCustomAttribute($node, "TimeStamp");
// Status is up
if (CurrentStatus == 0)
{
if (PreviousState != CurrentStatus)
{ // just changed to up
// update mttr
TotalDowntime = GetCustomAttribute($node, "TotalDowntime") + LastTime;
mttr = TotalDowntime / ((NumFailures == 0) ? 1 : NumFailures) / 3600; // to prevent division by ze
SetCustomAttribute($node, "TotalDowntime", TotalDowntime);
SetCustomAttribute($node, "mttr", mttr);
}
else
{ // still up
// update mtbf
TotalUptime = GetCustomAttribute($node, "TotalUptime") + LastTime;
mtbf = TotalUptime / ((NumFailures == 0) ? 1 : NumFailures) / 3600; // to prevent division by zero
SetCustomAttribute($node, "TotalUptime", TotalUptime);
SetCustomAttribute($node, "mtbf", mtbf);
}
}
// Status is down
if (CurrentStatus == 4)
{
if (PreviousState != CurrentStatus)
{ // just changed to down
// update mtbf
NumFailures++;
TotalUptime = GetCustomAttribute($node, "TotalUptime") + LastTime;
mtbf = TotalUptime / NumFailures / 3600;
SetCustomAttribute($node, "NumFailures", NumFailures);
SetCustomAttribute($node, "TotalUptime", TotalUptime);
SetCustomAttribute($node, "mtbf", mtbf);
}
else
{ // still down
// update mttr
TotalDowntime = GetCustomAttribute($node, "TotalDowntime") + LastTime;
mttr = TotalDowntime / NumFailures / 3600;
SetCustomAttribute($node, "TotalDowntime", TotalDowntime);
SetCustomAttribute($node, "mttr", mttr);
}
}
If (CurrentStatus == 0 || CurrentStatus == 4)
{
// Save previous state and timestamp
SetCustomAttribute($node, "PreviousState", CurrentStatus);
SetCustomAttribute($node, "TimeStamp", time());
// perAvailability section
TotalUptime = GetCustomAttribute($node, "TotalUptime");
TotalDowntime = GetCustomAttribute($node, "TotalDowntime");
perAvailability = TotalUptime / (TotalUptime + TotalDowntime) * 100;
SetCustomAttribute($node, "perAvailability", perAvailability);
return perAvailability;
}
Dummy
MTTR (hours)
4
0
60
30
0
0
0
0
0
0
return GetCustomAttribute($node, "mttr");