If you are monitoring Exchange 2013 Servers, you may receive this alert from your Mailbox Servers:
Database ‘DATABASE’ is low on log volume space. ‘DATABASE’ is low on log volume space. Current=xx GB, Threshold=195.31 GB
You can check the status also by issuing this command in the Exchange Management Shell:
Get-ExchangeServer | Get-Serverhealth -HealthSet Diskspace | ? AlertValue -ne Healthy | ft –autosize
The reason is because Exchange expects that there will be at least 200 GB (or 195.31 GB) free disk space on the disk hosting the database log files. which might not be the case for your deployment, probably because you don’t need all that much of space.
The solution is simple (It will work for Exchange 2013 With SP1 (CU4) or later):
1- Open Powershell on your Mailbox Server(s).
2- Run this command (Replace 10240 by your desired value of Free Disk Space threshold in MB):
New-ItemProperty "HKLM:Software\Microsoft\ExchangeServer\v15\ActiveMonitoring\Parameters\" -Name "SpaceMonitorLowSpaceThresholdInMB" -Value 10240 -PropertyType "DWord"