How can I pay for the reservation of memory on all virtual machines to "0"?

I am trying to write a script that will pay for the reservation of memory on all virtual machines that are invited in a cluster to '0 '.  We have book too much memory, and this setting should allow VMWare facilities manage reserves memory for me.  I have hundreds of virtual machines to update, so I can't do it by hand.  I hope that it is possible via the CLI.

Can someone help me with this please?

Matt example work certainly, and I'm sure that he was going to follow up with something similar to this after having confirmed if it worked or not because it is much more serious on the optimization of code for speed, but I'll (try to) save the effort. To test its extract on a cluster of 45 VMS, it took more than four minutes to complete.  The excerpt below took about 25 seconds.  The difference is of course to use the cmdlet "Get-View" and that it can run asynchronously so (it begins a vCenter task and immediately passes the following).  Of course, this will also put more of a strain to your vCenter server, so keep that in mind.

$spec = New-Object VMware.Vim.VirtualMachineConfigSpec
$spec.memoryAllocation = New-Object VMware.Vim.ResourceAllocationInfo
$spec.memoryAllocation.Reservation = 0
Get-Cluster "YOUR_CLUSTER" | Get-VM | Get-View -Property Config.MemoryAllocation | %{$_.ReconfigVM_Task($spec)}

Tags: VMware

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