SCOM performance rule for logical disk performance is collected in /sec and you need to create your own report by
1) using the following SQL query to extract disk performance data in
select ruledefaultname, instancename, DATEADD(hh,8,datetime) as eventdate, averagevalue * 1000, path from [Rule] inner join PerformanceRuleInstance on [Rule].RuleRowId=PerformanceRuleInstance.RuleRowId inner join perf.vPerfHourly on
PerformanceRuleInstance.PerformanceRuleInstanceRowId =Perf.vPerfHourly.PerformanceRuleInstanceRowId inner join ManagedEntity on Perf.vPerfHourly.ManagedEntityRowId=ManagedEntity.ManagedEntityRowId where (
RuleDefaultName like '%average disk seconds per read%' or RuleDefaultName like '%average disk seconds per write%'
) and DATEDIFF(dd,DATEADD(hh,8,datetime),GETDATE()) < 7 and (Path like
'abc-App%' or Path like 'abc-DB%') order by ruledefaultname,Path, InstanceName,eventdate
a) "Path like 'abc-App%' or Path like
'abc-DB%'" is server which I want to extract it HD disk performance
b) RuleDefaultName is the performance collection rule which collection disk performance
c) the above SQL extract past 7 day performance data
2) Feed this data into your custom SSRS report or in excel format
Roger