Solved

Question about locking memory in VMware host.

Posted on 2016-09-13
3
58 Views
Last Modified: 2016-09-13
Hello i have a question about locking memory issue in Vmware Esxi 5.5.
I have a host with 64 GB RAM. I want to lock all memory to one VM. When i did it and want to power on VM, error with insuficient resources blocking the VM from start. Then i try and realize that i can reserve only about 58 GB of memory and the VM turns on. It is normal? Where is the rest of memory? It is used by vmware?

Thank you.
0
Comment
Question by:Pavol Vrabec
  • 2
3 Comments
 
LVL 120

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 41795553
Firstly this is TOO BE expected, and usual behaviour.

The Hypervisor requires some memory to operate, also for every VM, there is also a memory overhead, required by the hypervisor to execute the VM.

So Hypervisor requires memory for it's OS + Memory overhead for the VM, to satisfy 64GB is probably greater than 64GB.

If you want to allocate ALL memory in the host to a VM, why use a hypervisor ? Install on bare metal or increase memory in the host.

it may not be a good candidate for virtualization, considering the cost of the hypervisor license!

Memory Reservation is the function to use, because it GUARANTEES memory for the VM, e.g. ring fences the memory resource, so no other VM can take memory away from the VM, whether that VM is using all the memory or not it does not matter.
0
 

Author Comment

by:Pavol Vrabec
ID: 41795555
Yes i know but later we want to buy additional resources and add another VMs. So thank you now i understand the problem.
0
 
LVL 120
ID: 41795560
No problems.
0

Featured Post

Visualize your virtual and backup environments

Create well-organized and polished visualizations of your virtual and backup environments when planning VMware vSphere, Microsoft Hyper-V or Veeam deployments. It helps you to gain better visibility and valuable business insights.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
VM edit 2 68
Migrating Windows vCenter Server 5.5 to VCSA 6.5 8 157
How can I copy virtual machine through vSphere Client 2 73
DC freezes when running VMTools 15 64
Will try to explain how to use the VMware feature TAGs in the VMs and create Veeam Backup Jobs using TAGs. Since this article is too long, I will create second article for the Veeam tasks.
Giving access to ESXi shell console is always an issue for IT departments to other Teams, or Projects. We need to find a way so that teams can use ESXTOP for their POCs, or tests without giving them the access to ESXi host shell console with a root …
Teach the user how to use configure the vCenter Server storage filters Open vSphere Web Client:  Navigate to vCenter Server Advanced Settings: Add the four vCenter Server storage filters: Review the advanced settings: Modify the values of the four v…
This Micro Tutorial steps you through the configuration steps to configure your ESXi host Management Network settings and test the management network, ensure the host is recognized by the DNS Server, configure a new password, and the troubleshooting…

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question