We help IT Professionals succeed at work.
Get Started

Hyper-V VMs see maximum of 8 processors but no more

127 Views
1 Endorsement
Last Modified: 2020-01-22
Environment:
Four-node Windows Server 2019 Hyper-V cluster, balancing 80 VMs.  Cluster was created over 6 months ago, is stable, and migrates/balances VMs successfully.

Issue:
Three identical VMs running Windows Server 2008 R2 were changed to increase processors and memory from 8/16GB to 16/32GB on 9 January.  It was discovered today that the guest OS only sees 8 processors instead of the configured 16.  No other changes were made, and we have other similar VMs that run 16/32GB without issues.

Using PowerShell we're unable to find any differences in the VM configuration between VMs seeing all 16 processors vs. the three VMs that don't.  Reducing/increasing processors and memory on the three VMs makes no difference.  Allocated memory is recognized as set, but no more than 8 processors are recognized by the guest OS.

We've confirmed we can create a new VM and attache the existing virtual disk to side-step the issue, but this is cumbersome due to extensive network configurations that then need to be recreated from scratch.

Does anyone have any insights are what/where we might find the cause or resolution?
Comment
Watch Question
Commented:
This problem has been solved!
Unlock 1 Answer and 8 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant

An Experts Exchange subscription includes unlimited access to online courses.

Get Started
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE