SAM: Cannot Get Average Statistic Data for Some Components

Hi,

I'm using some different application monitors to monitor service and disk usage on my Linux server.

Like below:

The first three are Linux script monitor to monitor disk usage.

The other two are TCP monitor.

As you can see, all 5 monitors have statistic data.

I want to create a report to show average statistic data in last 7 days.

I use the follow SQL query to get data:

SELECT  TOP 100 Convert(DateTime,Floor(Cast((DateTime) as Float)),0) AS SummaryDate,

Nodes.NodeID AS NodeID,

Nodes.Caption AS NodeName,

APM_AlertsAndReportsData.ComponentName AS Component_Name,

AVG(APM_StatisticsUsage.AvgStatisticData) AS AVERAGE_of_Statistic_Data

FROM

(Nodes INNER JOIN APM_AlertsAndReportsData ON (Nodes.NodeID = APM_AlertsAndReportsData.NodeId))  INNER JOIN APM_StatisticsUsage ON (APM_AlertsAndReportsData.ComponentId = APM_StatisticsUsage.ComponentID)

WHERE

( DateTime BETWEEN 41750 AND 41757.5 )

AND 

(

  (Nodes.Caption = 'xxxxxx008')

)

GROUP BY Convert(DateTime,Floor(Cast((DateTime) as Float)),0),

Nodes.NodeID, Nodes.Caption, APM_AlertsAndReportsData.ComponentName

ORDER BY SummaryDate ASC, 3 ASC

But I can only get average data for two TCP monitors, no data for Linux script monitor, but actually, disk usage information is what I want.

I have also tried web-based report, but the same result.

Is there anybody can help me to get average statistic data for disk usage?

Thanks in advance.