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I have two VMs in ESXi5.5 environment that are swapping memory. After a long research I found out the below two articles where it is explained that one must compare the values of memsize and sched.mem.max and they must be the same or sched.mem.max should be greater than memsize.

"Unballooning" RAM that's been ballooned by VMware

VMWare KB1003470

The problem is that I can not find this sched.mem.max parameter. I've checked the .vmx files on all of my VMs and at all of them that value missing.

We have a fairly large environment of multiple hosts and clusters. There is no VM with the sched.mem.max parameter. Also the VMs are all at version 10.

This is what I've done so far according to the KB article :

  • Set the value of sched.mem.max to the allocated memory or greater. [DOES NOT EXIST]
  • Select the virtual machine's Resources > Memory > Limit > Unlimitedbox.[CHECK]
  • Migrate the virtual machine to another host. [CHECK] - and the other host started swapping too :(
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Spirit
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    If you can't find the parameter, you'll have to *set* it. – GregL Jul 23 '15 at 15:41
  • I thought of that as well, but where can I set that parameter? At `vm options` perhaps? – Spirit Jul 23 '15 at 15:45
  • Open the *Edit Settings* dialog for the VM, go to the *VM Options* tab, srcroll down to, and expand, *Advanced*, then click on *Edit Configuration...*. Here you'll get a list of all the advanced config options and you can click *Add Row* to add the one you want. You'll need to shutdown the VM for this to work though, otherwise the *Edit Configuration...* button is greyed out. – GregL Jul 23 '15 at 15:50
  • Ok, I've tried this on one other Test VM (which didn't have swapping problems) just to see how the VM will behave afterwards. The two VMs who swap are critical production and can not be shut down right now. I will try this once I have a maintenance window and post the results than. – Spirit Jul 23 '15 at 16:12

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