Disk space alert does not trigger for Exchange Servers

Overview

This article provides brief information and steps to resolve the issue when Disk space alert does not trigger for Exchange Servers.

2 Exchange Servers ran out of disk and no alerts were trigggered: 

• This resulted in exchange database being down impacting email services.
• There is no entry in Event and Alert tabs on 10/03 for this node for the disk space issue on R drive. 
• R drive ran out of disk space on 10th March which caused the Exchange database to go down.

Environment

NPM version  11.5.2

Cause 

DB Tables and Diagnostics proved R: Drive was added to some exchange Servers and on other ones it did not trigger as it was not added at that point in ti,e. G Drive triggered fine on same day.
R: Drives Added recently had much higher Volume IDs.

Example:

Exchange Servers:

Node:

• NodeiD               111
• Node Name       BMail02
• MachineType    Windows Server 2012
• PollingVia            WMI

Volumes

• VolumeC            Used= 83%     ID=2622     C:\ Label:OSDisk 65667D9B0
• VolumeD            Used= 47%     ID=2623      D:\ Label: EEE31F4B
•  

Resolution

To resolve this in Future, simply LIST Resources on those  Exchange Servers and tick all Drives needing to be monitored. R: Drive in this instance. 

Node Details Page or Manage Nodes > List Resource > Add R: Drive and save.

Useful Queries to troubleshoot:

AlertsHistoryView
SELECT TOP 2000 * FROM [dbo].[AlertHistoryView]
where RelatedNodeID = 251
order by timestamp desc

Volumes
SELECT TOP 5000 * FROM [dbo].[VolumeUsage_Detail]
where volumeID = 2617
order by Datetime desc
​

SELECT TOP 5000 * FROM [dbo].[VolumeUsage_Hourly]
where volumeID = 2617
order by Datetime desc
 

Events:
select top 5000 * from Events
where NetworkNode = 251
order by eventTime desc