Description
This alert will monitor each drive being used by SQL Server. It first gets the free space in MB by running xp_fixeddrives and then gets total disk space from perfmon / WMI. It will return each pair of drive letter and percent free space to the alert so appropriate threhsolds can be tested.
Alert Definition
To create the alert, click on Alerts > Manage Alerts tab and create a Custom Alert of type Custom SQL Alert - Multiple Numeric Return. Configure the alert with values similar to these:
Alert Name: Disk Percent Free Space
Execution Interval: 1 hour
Notification Text: The following disk drives are running low on disk space.
SQL Script:
SET NOCOUNT ON
DECLARE @hr int, @fso int, @drive char(1), @odrive int, @TotalSize varchar(20);
-- Create a temp table for our working data. Load free space info into it first for each drive
IF OBJECT_ID('tempdb..#drives') IS NOT NULL
DROP TABLE #drives
CREATE TABLE #drives (drive char(1) PRIMARY KEY, FreeSpace int NULL,TotalSize int NULL)
INSERT #drives(drive,FreeSpace) EXEC master.dbo.xp_fixeddrives
-- Open up a connection to perfmon so we can get total space for a drive
EXEC @hr=sp_OACreate 'Scripting.FileSystemObject',@fso OUT
IF @hr <> 0 EXEC sp_OAGetErrorInfo @fso
-- walk thru each drive and get the total space from perfmon
DECLARE dcur CURSOR LOCAL FAST_FORWARD FOR SELECT drive from #drives ORDER by drive
OPEN dcur FETCH NEXT FROM dcur INTO @drive
@FETCH_STATUS=0
BEGIN
EXEC @hr = sp_OAMethod @fso,'GetDrive', @odrive OUT, @drive
IF @hr <> 0 EXEC sp_OAGetErrorInfo @fso EXEC @hr = sp_OAGetProperty @odrive,'TotalSize', @TotalSize OUT
IF @hr <> 0 EXEC sp_OAGetErrorInfo @odrive
UPDATE #drives SET TotalSize=CONVERT(numeric,@TotalSize)/1024/1024 WHERE drive=@drive
FETCH NEXT FROM dcur INTO @drive
END
-- cleanup after ourselves
CLOSE dcur
DEALLOCATE dcur
EXEC @hr=sp_OADestroy @fso IF @hr <> 0 EXEC sp_OAGetErrorInfo @fso
-- return the results to the Ignite alert
-- For Ignite alerts, it expects this query to return the drive letter and then one more column
-- If you want to alert on Free MB, leave the drive and FreeSpace columns uncommented
-- If you want to alert on Free %, leave the drive and Free(%) columns uncommented - this is the default
SELECT drive,
-- TotalSize as 'Total(MB)',
-- FreeSpace as 'Free(MB)',
100.0 * FreeSpace / TotalSize 'Free(%)'
FROM #drives
ORDER BY drive
DROP TABLE #drives
Execute Against: Monitored Instance
Units: % Free
High Threshold: Min 0, Max 5
Medium Threshold: Min 5, Max 10
