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| function Optimize-DRSSeparateVMs { | |
| <# | |
| .SYNOPSIS | |
| Creates DRS rules to keep similar VMs on separate VMHosts.Existing AntiAffinity rules are removed. | |
| If VMHosts.count is less than or equal to 4, the max VMs per group is count-1. Otherwise count-2 | |
| .EXAMPLE | |
| Create DRS rules on MYCLUSTER | |
| Optimize-DRSSeparateVMs -Cluster MYCLUSTER | |
| .EXAMPLE | |
| Create DRS rules on all clusters | |
| Get-Cluster | Sort Name | %{ Optimize-DRSSeparateVMs -Cluster $_.Name } | |
| #> | |
| [cmdletbinding()] | |
| param ( | |
| [Parameter(Mandatory=$true)] | |
| [string]$Cluster, | |
| [string]$ExclusionFilter = "*Veeam*" | |
| ) | |
| try { | |
| $ErrorActionPreference = "STOP" | |
| # Get Cluster object | |
| $ClusterObj = Get-cluster -Name $Cluster | |
| # Remove existing VMAntiAffinity rules that dont match exclusion filter | |
| Get-Drsrule -Cluster $ClusterObj | Where-Object { $_.Name -notlike $ExclusionFilter -and $_.Type -eq "VMAntiAffinity" } | Remove-DrsRule -Confirm:$false | |
| # Get VMs in Cluster except for VMware DRS VMs and Veeam replicas | |
| $vms = $ClusterObj | get-vm | Sort-Object name | Where-Object { $_.name -notlike "*vcls*" -and $_.name -notlike "*replica*" } | |
| # Get VMHost in Cluster | |
| $vmhosts = @($ClusterObj | get-vmhost) | |
| if($vmhosts.count -le 4) { | |
| # Max VMs per group. Less than count to minimize issues with maintenance/failed VMHosts | |
| $max = $vmhosts.count - 1 | |
| } else { | |
| $max = $vmhosts.count - 2 | |
| } | |
| # Determine VM Type from characters 3-7 in VMName | |
| $vms | ForEach-Object { Add-Member -InputObject $_ -MemberType NoteProperty -Name Type -Value ($_.Name.Substring(3,4)) -Force } | |
| # Group VMs by Type. DRS groups are not needed with only 1 VM | |
| $groups = $vms | Group-Object -Property Type | Where-Object { $_.Count -gt 1 } | |
| # Split groups based on maximum of VMHosts-2 VMs per group | |
| $groups2 = foreach ($group in $groups) { | |
| Write-Host "Processing $($Group.Name)" | |
| # If group is greater than number of vmhosts then create multiple groups | |
| if ($group.count -gt $max) { | |
| # Counter for DRS rule index | |
| $index = 1 | |
| for ($skip = 0; $skip -lt $group.group.count; $skip += $max) { | |
| $members = $group.group | Select-Object -First $max -Skip $skip | |
| if ($members.count -ne 1) { | |
| [pscustomobject]@{ | |
| Count = $vmhosts.count | |
| Name = $group.Name | |
| Group = $members | |
| Counter = $index | |
| } | |
| $index++ | |
| } | |
| else { | |
| Write-Host "Only 1 member for $($group.Name + $index). No DRS rule needed" | |
| } | |
| } | |
| } | |
| else { | |
| $group | |
| } | |
| } | |
| # Create DRS rules from groups | |
| foreach($group in $groups2) { | |
| if($null -ne $group.Counter) { | |
| $newName = "$($group.Name.ToUpper()) on Separate Hosts - $($group.Counter)" | |
| } else { | |
| $newName = "$($group.Name.ToUpper()) on Separate Hosts" | |
| } | |
| Write-Host "$($ClusterObj.Name)`: Creating $newName" | |
| New-DrsRule -Cluster $ClusterObj -Name "$newName" -KeepTogether:$false -VM $group.group | |
| } | |
| } | |
| catch { | |
| throw | |
| } | |
| } |
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