Unhealthy state is caused by low space free space across all log files. Low free space can be caused by:
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Inadequate file configuration settings (size, max size, autogrowth, etc.)
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Inadequate space left on the media
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Lack of periodic regular backups
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Log not truncating
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“Include Disk Space” setting for this monitor is set to FALSE for workloads that expect their files to grow.
Use the following link to view the performance data: Database Performance Data
This monitor aggregates the space available for each log file within a database depending on each file configuration:
No Autogrowth
For a file that has no autogrowth, free space would be the difference between the initial size for a file and the used space.
Autogrowth Enabled
In addition to the difference between the file size and the used space, the free space for files with autogrowth enabled would be the minimum of either the difference between the max size and the file size and the free space left on disk.
Low free space for database log files that have autogrowth could mean that the file is approaching the limits of the hosting logical drive. For files with autogrowth enabled with a max size, low free space could also mean that the file is approaching the max size specified for a file.
The free space calculations also take into account that the file can also fail to grow if the growth amount of the file is greater than the amount left on disk, and that the file cannot grow if the difference between the max size and the current file size is less than the growth amount. In these situations, available free space left on disk is not included as a part of the free space, because we cannot grow any longer. |