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    Hi,

    I have a scom 2019 environment.
    One of my microsoft server 2012 r2 servers has a full system disk. We noticed this when the sccm deployment failed for microsoft updates. My question is why scom didn't create an alert for the full disk. The agent is healthy (green).
    What should ik check or do.

    Regards

    Tom

    Monday, May 11, 2020 12:15 PM

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    Hi,

    Are you first of all monitoring the disks on the specific server?

    Do you have the Windows Server operating system management pack imported? If yes, have a look at the Health Explorer and check if you see the disks being monitored there.

    Best regards,
    Leon

    Blog: https://thesystemcenterblog.com LinkedIn:

    Monday, May 11, 2020 12:33 PM
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    Hi Tom,

    the most common reason for that is that the free disk space monitor consists of two thresholds and they BOTH have to be met in order for the alert to be generated. This is depicted here:

    How Logical Disk free space monitoring works in SCOM
    https://kevinholman.com/2019/07/09/how-logical-disk-free-space-monitoring-works-in-scom/

    Regards,

    (Please take a moment to "Vote as Helpful" and/or "Mark as Answer" where applicable. This helps the community, keeps the forums tidy, and recognizes useful contributions. Thanks!) Blog: https://blog.pohn.ch/ Twitter: @StoyanChalakov

    Tuesday, May 12, 2020 7:11 AM
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    As Stoyan as pointed out there are two conditions for disk alerts which have to be met in order for the state to change. Also if space did somehow get cleared moments after it was full (sometimes wsus cleanups or maintenance tasks in SCCM can do that or using shadow copy backup enable/disable) then it will still remain green.

    Having said that you may have got an alert from your SCCM Management pack if you have it installed which would indicate a server role in your sccm estate has entered an unhealthy state which would pick up the disk alert.

    Are you using the default thresholds for your server 2012 r2 logical disk alerts?

    Website: www.walshamsolutions.com Technical Blog: https://www.walshamsolutions.com/technical-blog Personal Blog: https://www.walshamsolutions.com/personal-blog Twitter: Dwalshampro

    Tuesday, May 12, 2020 8:20 AM
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    Hi,

    You must have the Windows server operating system MP installed for the logical disk alerting.

    If the agent is green, check the closed alerts if any disk alert was raised. Best to check if the monitor for CLASS: Windows server 2012 logical disk is enabled. Both the error % threshold & error Mbytes threhold for system drives needs to be breached for alert to trigger keeping in mind the interval seconds also.

    Also please check the health explorer for the device to check if the monitoring was stopped at all for sometime frame. Let me know if you check the above.

    Thanks,

    Amit

    (Please take a moment to "Vote as Helpful" and/or "Mark as Answer" where applicable. This helps the community, keeps the forums tidy, and recognizes useful contributions. Thanks!)

    Tuesday, May 12, 2020 12:22 PM
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    Hi,

    Are you first of all monitoring the disks on the specific server?

    Do you have the Windows Server operating system management pack imported? If yes, have a look at the Health Explorer and check if you see the disks being monitored there.

    Best regards,
    Leon

    Blog: https://thesystemcenterblog.com LinkedIn:

    Hi,

    I have the MP installed but i notice some differences when looking at the monitors in the authoring pane and looking at the health explorer.

    I can't enable

    I can't disable

    Looking at the health explorer the logical disk free space shows status not monitored, the windows 2012 logical disk free space monitor shows monitored. Both with no alerts. 

    Could this have something to do with the fact i'm using SCOM 2019.
    Server 2012 R2 is still supported isn't it?

    Tuesday, May 19, 2020 7:02 PM
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    As Stoyan as pointed out there are two conditions for disk alerts which have to be met in order for the state to change. Also if space did somehow get cleared moments after it was full (sometimes wsus cleanups or maintenance tasks in SCCM can do that or using shadow copy backup enable/disable) then it will still remain green.

    Having said that you may have got an alert from your SCCM Management pack if you have it installed which would indicate a server role in your sccm estate has entered an unhealthy state which would pick up the disk alert.

    Are you using the default thresholds for your server 2012 r2 logical disk alerts?

    Website: www.walshamsolutions.com Technical Blog: https://www.walshamsolutions.com/technical-blog Personal Blog: https://www.walshamsolutions.com/personal-blog Twitter: Dwalshampro

    I have inherrited the SCOM environment so i'm not sure the settings are default.
    How can i check this?

    Tuesday, May 19, 2020 7:04 PM
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    Hi,

    You must have the Windows server operating system MP installed for the logical disk alerting.

    If the agent is green, check the closed alerts if any disk alert was raised. Best to check if the monitor for CLASS: Windows server 2012 logical disk is enabled. Both the error % threshold & error Mbytes threhold for system drives needs to be breached for alert to trigger keeping in mind the interval seconds also.

    Also please check the health explorer for the device to check if the monitoring was stopped at all for sometime frame. Let me know if you check the above.

    Thanks,

    Amit

    (Please take a moment to "Vote as Helpful" and/or "Mark as Answer" where applicable. This helps the community, keeps the forums tidy, and recognizes useful contributions. Thanks!)

    The MP for server 2012 is installed. I hope this also covers server 2012 R2.
    I didn't find an closed alert for the disk space

    Looking at my parameters. Does this mean there has to be las then 5% free space and the 5% needs to be less then 1000MB. That doesn't make sense. Why should i use a percentage and an MB number? 

    • Edited by ThomasB1972 Tuesday, May 19, 2020 7:16 PM image resize
    Tuesday, May 19, 2020 7:15 PM
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    The "Logical Disk Free Space" monitor is a deprecated monitor which is no longer used and disabled by default, hence the reason why it's gray, the link Stoyan provided explains well how these monitors work:
    https://kevinholman.com/2019/07/09/how-logical-disk-free-space-monitoring-works-in-scom/

    The "Logical Disk Free Space Monitor" is the monitor that is currently being used, you'll find the default settings by checking the "Default Value" under overrides, or over at the System Center Wiki:
    https://systemcenter.wiki/?GetElement=Microsoft.Windows.Server.6.2.Legacy.LogicalDisk.FreeSpace.Monitor&Type=UnitMonitor&ManagementPack=Microsoft.Windows.Server.2012.Monitoring&Version=6.0.7323.0

    The 2012 management pack covers 2012 R2 as well, this you'll find on the Windows Server management pack's download link or in the management pack guide.

    You'll receive an error alert when BOTH the Percentage and Megabyte thresholds are met.

    • System drives reach 5% available disk space AND when there's 300 MB of free disk space left.
    • Non-system drives reach 5% of available disk space AND when there's 1000 MB of free disk space left.

    Note: Alerts are only generated when the monitor is in a critical state.

    Blog: https://thesystemcenterblog.com LinkedIn:


    • Edited by Leon Laude Tuesday, May 19, 2020 7:30 PM
    Tuesday, May 19, 2020 7:30 PM
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    Hello Thomas,

    Yes MP for server 2012 also contains 2012 R2. In your case, you're expecting alert for F:/ which is non-system drive. The screenshot you shared shows this monitor is disabled(Enabled parameter's effective value = False.) This needs to be true if you expect an alert to generate. 

    Also, error% is 5% which means the F:/ needs to be less than 5% and less than 1000Mb or 1Gb for an alert to generate. Its an AND Monitor.

    Lets say the drive is 100Gb, so alert will only generate if its breached 5%(Error %) i.e. 5Gb & less than 1Gb(Error Mbytes).

    Hence, in this case  if the drive has breached less than 1Gb, then alert would have generated. Since this monitor is not enabled, you can't expect an alert.

    Hope this answers your question.

    Thanks,

    Amit

    (Please take a moment to "Vote as Helpful" and/or "Mark as Answer" where applicable. This helps the community, keeps the forums tidy, and recognizes useful contributions. Thanks!)

    AS

    Wednesday, May 20, 2020 7:09 AM
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    Hey Thomas,

    I hope you are doing good. What is the status here, did you managed to sort this out?

    Thnaks in advance!

    Regards,

    (Please take a moment to "Vote as Helpful" and/or "Mark as Answer" where applicable. This helps the community, keeps the forums tidy, and recognizes useful contributions. Thanks!) Blog: https://blog.pohn.ch/ Twitter: @StoyanChalakov

    Tuesday, May 26, 2020 6:33 AM