![]() This type of monitoring is INCREDIBLY detailed, and creates a huge instance space in SCOM that will only serve to slow down your environment, console, and increase config and monitoring load. What about monitoring individual *logical processors* like virtual CPU’s or actual cores on physical servers? Can we do that?įirst – let me start by saying – I DON’T recommend you do this. Ok – so that covers the basic monitoring of the CPU, from an _Total perspective. This is a typical Windows problem in how windows looks at processes, not a SCOM issue. but this server has 32 cores, so it looks like you need to multiply by the number of cores to understand the ACTUAL utilization consumed by a process. Note – the numbers are not exactly correct – my “ProcessorHog” process was consuming 100% of the CPU…. The default monitor has a Diagnostic task on it – that will output the top consuming processes to health explorer state change context: Another thing to keep in mind, this is a PowerShell script based monitor, so if you want to run this VERY frequently (the default is every 15 minutes) then consider replacing it with a less impactful native perfmon based monitor. If you find this is too noisy, you can use the CPU queue length, but use lower value than the default of 15. This will result in the equation ignoring the CPU queue length requirement, and make the monitor consider “% Processor Time” only. If you like this, great! If you don’t like this, then you have two options.ġ) Re-write your own monitor and make it a very simple consecutive or average samples threshold performance monitor.Ģ) Override the default monitor – but set the “CPU Queue Length” threshold to “-1” as in the picture below: What this means, is that it is VERY unlikely this monitor will ever trigger, unless your system is absolutely HAMMERED. Not only that, but the value must be above 60 for the average of any three consecutive samples. So on a typical VM with 4 virtual CPU’s, this means that the value of SYSTEM\Processor Queue Length must be great than (15*4) = 60. The default threshold of “15” is multiplied times the number of logical CPU’s for the server. This means that even if your server is stuck at 100% CPU utilization, it will not genet an alert most of the time. ![]() System / Processor Queue Length (default threshold 15)īOTH of these above thresholds must be met, before we will create a monitor state change/alert. Processor Information / % Processor Time / _Total (default threshold 95) The script evaluates TWO DIFFERENT perfmon counters: This monitor does not use a native perfmon module, it runs a PowerShell script. Like previous versions of the CPU monitor, this is often misunderstood. ![]() The samples are not consecutive samples as the product knowledge states – they are AVERAGE samples. It runs every 15 minutes, and evaluates after 3 samples. This monitor (Total CPU Utilization Percentage or .10.0.OperatingSystem.TotalCPUUtilization) targets the “Windows Server 2016 Operating System” class. In the Windows Server 2016 OS Management Pack, there is a built in monitor which evaluates the Processor load. Ok, all warnings aside – lets figure out how this works. That said, while complicated and somewhat difficult to understand, it is very powerful and useful, and limits “noise”. If you don’t like it – there is *NOTHING* wrong with nuking this from orbit (disable via override) and just create your own very simple consecutive samples (or average) monitor. The way SCOM monitors Processor time is complicated.
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