Hi Ranjna,
Indeed, take a look at p8 in particular on http://labs.vmware.com/download/92/
The 2 settings you want to amend are:
VmDemandHistorySecsHostOn - can up the interval from a default of 5 minutes to 60 minutes
VmDemandHistorySecsHostOff - again can up it from default of 40 minutes to 60 minutes
Many tx!