Availability Management is a process of the Service Delivery (ITIL specifications). Its goal is to ensure that the required level of availability is provided. The measurement and monitoring of IT availability is a key activity to ensure availability levels are being met consistently.
APM | Reporting | Availability
1 . Choose between host, host group, service or service group:
2 . Select from the list:
3 . Select the desired period:
You will end up looking at a report showing your selected hosts and four status percentage columns:
Below is a description of the columns:
Host – The name of the host as it appears in APM
% Time Up – How much of the time the host was actually up (this is the standard availability value)
% Time Down – How much the host was actually down
% Time Unreachable – How much time the host was unreachable (different from “Down” in that this could be caused by a network outage resulting in the host not being reachable due to unavailability of its parent hosts, but not actually being down itself).
% Time Undetermined – Percentage of time in which APM did not have complete log data on the device and so cannot provide uptime statistics for that timeframe. This can be happen with newly added devices, for example.
Time Undetermined and Numbers in Brackets
Also with regards to the “% Time Undetermined” column, you will notice that APM shows two values for each of the other metrics, one “normal” and one in brackets – 86.200% (86.200%). If the “% Time Undetermined” is zero, then these two numbers will always match, however should you have any instances where APM did not have log data available for the specified time period, you will see it reflect in the other columns. So for example, with recently added devices, the number in brackets will show the actual system uptime, while the “normal” number will assume that the device was simply down. In a situation like this, the number you want to show to your boss is the one in brackets.