Free Up Memory for Hyper-V Guests

Mark Berry November 9, 2015

I run a small Server 2012 R2 machine that functions primarily as a Hyper-V server. It has 12 GB of RAM. The guests do not use dynamic RAM. Today I had four guests running, consuming a total of 7.5GB of RAM. I wanted to start a fifth guest that would use an extra 1 GB. That would still leave 3.5 GB physical memory free to run the host OS, which should be more than enough. But starting the VM kept failing with the message “Not enough memory in the system to start the virtual machine” (Hyper-V-Worker event ID 3122).

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Write Cache Warnings on Hyper-V Guest after KB2853952

Mark Berry October 10, 2013

Starting in September 2013, Windows Server 2012 R2 machines running as Hyper-V guests started issuing these warnings on reboot:

Log Name:      System
Source:        Disk
Event ID:      32
Level:         Warning
Description:
The driver detected that the device \Device\Harddisk0\DR0 has its write cache enabled. Data corruption may occur.

Log Name:      Directory Service
Source:        Microsoft-Windows-ActiveDirectory_DomainService
Event ID:      1539
Level:         Warning
Description:
Active Directory Domain Services could not disable the software-based disk write cache on the following hard disk.
Hard disk:
c:
Data might be lost during system failures.

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Restore a Hyper-V Server to an Optiplex 960, Take 3

Mark Berry April 6, 2013

This is the third in the series of almost annual articles about my experiences testing a Hyper-V restore. I’ve done this successfully in 2011 and 2012. Why repeat? To make sure disaster recovery is still possible, and to try a new approach.

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