Antivirus
During the Windows Server 2008 Hyper-V prerelease test phases, a number of early adopters came into work to find virtual machines were missing. To this day, this problem generates many requests for help on support forums and to Microsoft's support services. The cause is that engineers, consultants, and administrators have assumed that they can install an antivirus product onto the parent partition of a Hyper-V host server as if it were just a typical Windows Server. This is definitely not the case.
Hyper-V must have complete and unhindered access to all files related to virtual machine activity. Any interruption can lead to virtual machines disappearing. It may even cause virtual machine configuration files to become corrupted.
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