Solved

ESXi 6 and VM with 2TB of Memory

Posted on 2016-08-11
3
68 Views
Last Modified: 2016-08-13
Earlier today I fat figer a setting on a VM and instead of giving it 2GB I gave it 2GB. Now mind you the host only has 196GB of ram. I was a bit surprise the configuration even complete without error. I figure out the error after I powered up the VM and saw the error.

How could Vmware let this config succeed even though the host only had 196GB of ram. Yes I know you can over commit a host thanks to different memory saving techniques but this seem excessive. How was I even able to power up the VM? Maybe the host force other Vm to balloon?
0
Comment
Question by:compdigit44
3 Comments
 
LVL 10

Expert Comment

by:Richardson Porto
ID: 41753238
After exhaust all the physical memory (and use TPS, memory compression and balloon), VMware will use virtual swap through the file .vswp located by default on the same folder of your virtual machine, but of course with will be slower than real memory.
0
 
LVL 118

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 41753249
It's called Over Commit!

VM and Host have swap files, and you and you can use Flash/SSD rather than slow spinning rust.

Never used Swap to Cache ? SSD ? or PCI-E flash cards ?

http://www.yellow-bricks.com/2011/08/18/swap-to-host-cache-aka-swap-to-ssd/

I'm surprised you've never done it as a test to see what happens, and set to 4TB! and what the host go slow, and stop responding...and swap like made, and hit the disk I/O, and CPU goes 100%

It's not really VMware fault...

Give a child a Loaded Gun, and he'll shot himself by accident!
0
 
LVL 19

Author Comment

by:compdigit44
ID: 41754478
Thanks everyone...

After I powered up the VM the page file within the guest quickly expand filling up the drive. Granted this was on a test host that host our Dev VM but they connected to run and the host did not throw any alerts about high memory usage...
0

Featured Post

Comprehensive Backup Solutions for Microsoft

Acronis protects the complete Microsoft technology stack: Windows Server, Windows PC, laptop and Surface data; Microsoft business applications; Microsoft Hyper-V; Azure VMs; Microsoft Windows Server 2016; Microsoft Exchange 2016 and SQL Server 2016.

Question has a verified solution.

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

HOW TO: Install and Configure VMware vSphere Hypervisor 6.5 (ESXi 6.5), Step by Step Tutorial with screenshots. From Download, Checking Media, to Completed Installation.
In this article, I show you step by step with screenshots to assist you - HOW TO: Deploy and Install the VMware vCenter Server Appliance 6.5 (VCSA 6.5), with some helpful tips along the way.
Teach the user how to rename, unmount, delete and upgrade VMFS datastores. Open vSphere Web Client: Rename VMFS and NFS datastores: Upgrade VMFS-3 volume to VMFS-5: Unmount VMFS datastore: Delete a VMFS datastore:
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…

896 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

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now