Hello,

I have concern regarding 2 values from HMC. I am working on presenting data from HMC using REST API (Nextract plus).

I cannot understand difference between 2 values

1) server_processor - utilizedProcUnits

2) server_physicalProcessorPool utilizedProcUnits

Bellow we are looking on comparison of those 2 value on P9 Frame (40CPU). This yellow one is representing what lpar2rrd represents as CPU Pool, however I cannot understand what is a green one - server_processor - utilizedProcUnits and how can I use it for monitoring.

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Marcin Michalowski
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Hi Marcin,

This is something that doesn't give me peace of mind either:)

I have noticed that the utilization of "utilizedProcUnits" taken from "server_processor" matches the sum of the "utilizedProcUnits" utilization of LPARs on the machine (left side of the screenshot), and the utilization of "utilizedProcUnits" taken from "server_physicalProcessorPool" corresponds to the sum of the LPAR utilization expressed as ("utilizedUnCappedProcUnits" + "utilizedCappedProcUnits").
I think the similarity is clearly visible in the screenshot.

It is worth noting that documentation says: (link)
utilizedProcUnits = utilizedUnCappedProcUnits + utilizedCappedProcUnits - idleProcUnits

If you are use HMC older than V10R2M1040 then the formula is different:(link to old documentation)
utilizedProcUnits = utilizedUnCappedProcUnits + utilizedCappedProcUnits

Therefore, my hypothesis is that in the case of "server_processor" the CPU Idle, ("idleProcUnits") is subtracted, but I would like to see an explanation from someone smarter than me :)

Queries which I used:

• Left side:
  SELECT "utilizedProcUnits" FROM "lpar_processor" WHERE ("servername" =~ /^$Servername$/) AND $timeFilter GROUP BY "lparname"
SELECT "utilizedProcUnits" FROM "server_processor" WHERE ("servername" =~ /^$Servername$/) AND $timeFilter 
  
  
• Right side:
  SELECT "utilizedCappedProcUnits" + "utilizedUncappedProcUnits" FROM "lpar_processor" WHERE ("servername" =~ /^$Servername$/) AND $timeFilter GROUP BY "lparname"
SELECT "utilizedProcUnits" FROM "server_physicalProcessorPool" WHERE ("servername" =~ /^$Servername$/) AND $timeFilter 

Best regards,
Michal Wiktorek

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https://www.linkedin.com/in/michal-wiktorek-83b2b47b

Original Message:
Sent: Wed May 08, 2024 12:38 PM
From: Marcin Michalowski
Subject: HCM PCM understanding server_procesor and server_physicalProcessorPool

Hello,

I have concern regarding 2 values from HMC. I am working on presenting data from HMC using REST API (Nextract plus).

I cannot understand difference between 2 values

1) server_processor - utilizedProcUnits

2) server_physicalProcessorPool utilizedProcUnits

Bellow we are looking on comparison of those 2 value on P9 Frame (40CPU). This yellow one is representing what lpar2rrd represents as CPU Pool, however I cannot understand what is a green one - server_processor - utilizedProcUnits and how can I use it for monitoring.

------------------------------
Marcin Michalowski
------------------------------

Hello,

I have concern regarding 2 values from HMC. I am working on presenting the data from HMC using REST API (Nextract plus).

I cannot understand difference between 2 values

1) server_processor - utilizedProcUnits

2) server_physicalProcessorPool utilizedProcUnits

Bellow we are looking on comparison of those 2 value on P9 Frame (40CPU). This yellow one is representing what lpar2rrd represents as CPU Pool, however I cannot understand what is a green one - server_processor - utilizedProcUnits and how can I use it for monitoring.