PowerCLI Script to change the DRS Slider
- Ben Liebowitz
- 2
- 2839
So, I have a cluster of hosts that makes up our QA Environment. As with most QA environments, it’s tight on resources and very over-subscribed. On a regular basis, I have to move our DRS Slider to be more aggressive, RUN DRS to refresh recommendations, and then move the slider back. This allows DRS to rebalance the cluster. Today, I decided to script it.
I made use of a script that @lucd22 posted (http://vmw.re/1EQCDkn) to change the DRS Migration Threshold (slider value).
Here is the script:
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# Set Variables $clusName = CLUSTER_NAME $vCenter = VCENTER_NAME # Connect to your vCenter Connect-VIServer $vCenter # Change DRS Slider to Most Agressive # Choose the value of the slider, 1 being most agressive, and 5 being most conservative $rate = 1 write-host "Changing DRS Migration Threshold to most agressive" $clus = Get-Cluster -Name $clusName | Get-View $clusSpec = New-Object VMware.Vim.ClusterConfigSpecEx $clusSpec.drsConfig = New-Object VMware.Vim.ClusterDrsConfigInfo $clusSPec.drsConfig.vmotionRate = $rate $clus.ReconfigureComputeResource_Task($clusSpec, $true) # Run DRS to get new recommendations and apply them write-host "Refreshing DRS Recommendations" Get-DrsRecommendation -Cluster $clusName -Refresh # Change DRS Slider back to normal write-host "Changing DRS Migration Threshold back to Normal" $rate = 2 $clus = Get-Cluster -Name $clusName | Get-View $clusSpec = New-Object VMware.Vim.ClusterConfigSpecEx $clusSpec.drsConfig = New-Object VMware.Vim.ClusterDrsConfigInfo $clusSPec.drsConfig.vmotionRate = $rate $clus.ReconfigureComputeResource_Task($clusSpec, $true)
– Ben Liebowitz
Twitter: @ben_liebowitz
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2 thoughts on “PowerCLI Script to change the DRS Slider”
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I adapted your script to use a csv file as import to make the change on multiple clusters. The csv file has a single column with a header named Cluster. . .hence the $_.Cluster on line 6.
# Change DRS Migration Threshold
# Choose the value of the slider, 1 being most agressive, and 5 being most conservative
$rate = 5
Import-CSV “C:\temp\Change Cluster DRS level\clusters.csv” | ForEach-Object {
$clus = Get-Cluster -Name $_.Cluster | Get-View
$clusSpec = New-Object VMware.Vim.ClusterConfigSpecEx
$clusSpec.drsConfig = New-Object VMware.Vim.ClusterDrsConfigInfo
$clusSPec.drsConfig.vmotionRate = $rate
$clus.ReconfigureComputeResource_Task($clusSpec, $true)
}
Very nice! Glad it helped you.