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Nice to Know – Improve Bare Metal Deployment success rate in System Center Virtual Machine Manager

Posted by Mikael Nystrom on November 5, 2014

Bare Metal Deployment in SCVMM is a bit different compared to everything else, since it is using a push method. So instead of having some kind of client application controlling the deployment, the SCVMM server is controlling the OS Deployment. There could be issues, since SCVMM is building team and switches and there is a chance that SCVMM will loose connectivity to the host and the Bare Metal Deployment stops. In many case that is related to DNS and DNS cache, since that is the method used to be able to connect to the host during deployment. By decreasing the DNS cache timeout on the SCVMM server the success rate will improve very, very much.

How to fix it?

Logon to your SCVMM server and execute the following PowerShell commands to set the DNS Cache to a minimum and restart the DNS Cache services

New-ItemProperty "HKLM:\SYSTEM\CurrentControlSet\Services\Dnscache\Parameters" -Name "MaxCacheTtl" -Value 5 -PropertyType "DWORD" -Force
New-ItemProperty "HKLM:\SYSTEM\CurrentControlSet\Services\Dnscache\Parameters" -Name "MaxNegativeCacheTtl" -Value 5 -PropertyType "DWORD" -Force
Restart-Service -Name Dnscache -Force -Verbose

/mike

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