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cloudworxs's avatar
cloudworxs
Copper Contributor
Dec 29, 2022

Can you monitor OSDisk freespace instead of OSDisk IOPs of Azure VM running windows?

Can you monitor OSDisk freespace instead of OSDisk IOPs of Azure VM running windows?

I have a VM with only OS Disk attached and want to monitor its freespace and send email alerts.

 

I am not having any luck running this query for OS Disk. 

let setgbvalue = 10;
Perf
| where ObjectName == "LogicalDisk"
| where InstanceName !contains "C:"
| where InstanceName !contains "_Total"
| extend FreeSpace = CounterValue/1024
| summarize FreeSpace = min(FreeSpace) by Computer, InstanceName
| where FreeSpace < setgbvalue

2 Replies

  • felipesbarros's avatar
    felipesbarros
    Copper Contributor
    Mar 05, 2023

    Greetings cloudworxs and tommykneetz 

    As per my understanding the Perf table is related to Log Analytics using MMA (Microsoft Monitoring Agent) and InsightMetrics is the table used by AMA (Azure Monitoring Agent).

     

    I don't know if it is by design but I assume it is because by the moment I removed MMA and my queries stopped working the only way to have everything back using AMA was to use InsightMetrics table. I didn't find anywhere the accuracy of my assumption so I took it for granted. :lol:

     

    That said, here it is something you can try to achieve your results:

    • Using FreeSpaceMB which returns the Free Space of your machines in MB

     

    InsightsMetrics
| where Namespace == "LogicalDisk" and Name == "FreeSpaceMB"

     

     

    • Using FreeSpacePercentage which returns the free space in %

     

    InsightsMetrics
| where Namespace == "LogicalDisk" and Name == "FreeSpacePercentage"

     

     

    Cheers...

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