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System Center Virtual Machine Manager (VMM) Q&A – Part 1 - Windows Server blog by Kurt Roggen [BE]
maandag 7 juni 2010 11:40 Kurt Roggen

System Center Virtual Machine Manager (VMM) Q&A – Part 1

Here’s an overview of some of the most raised SCVMM questions and their answers:

Q: What is CPU Type in SCVMM 2008 R2 VM Processor Hardware Profile?
A: Just used for Intelligent Placement of virtual machines – not the actual vCPU 
More information: http://blogs.technet.com/mghazai/archive/2009/12/02/what-is-cpu-type-in-scvmm-2008-r2-vm-processor-hardware-profile.aspx

Q: What is the purpose of SCVMM Network Location and Tag?
A: Matching virtual networks during virtual machine deployment/migration 
More information: http://blogs.technet.com/apb/archive/2009/03/20/the-purpose-of-scvmm-network-location-and-tag.aspx

Q: How can I quickly/easily configure my Hyper-V running in a workgroup to allow remote administration using Hyper-V Manager?
A: Download HVremote
More information: http://blogs.technet.com/jhoward/archive/2008/11/14/configure-hyper-v-remote-management-in-seconds.aspx

Q: What’s the difference between “Host Reserve” and “Cluster Reserve”
A: Host Reserves define how much of a host’s resources are to reserved for the host operating system in terms of CPU, RAM, disk space, IOPS, network. 
Cluster Reserve specifies the number of node failures a cluster must be able to sustain while still supporting all virtual machines deployed on the host cluster. 
More information: http://fawzi.wordpress.com/2009/04/13/scvmm-host-reservers-and-cluster-reserve/

Q: Can I use DFS on my VMM Library?
A: Yes, but VMM 2008 is not DFS-aware; neither is it location-aware. There is no special logic in VMM for DFS-R and/or DFS-N. Both are unsupported and can lead to some known issues.
More information: http://blogs.technet.com/chengw/archive/2008/08/26/dfs-on-vmm-library.aspx

Q: What does 'over-committed' cluster status mean?
A: The “cluster reserve” specifies the number of node failures a cluster must be able to sustain while still supporting all virtual machines that are currently deployed on the clustered hosts.  If this cluster reserve cannot be met, the cluster is “over-commited”.
More information: http://blogs.technet.com/mbriggs/archive/2009/12/02/what-does-over-committed-status-really-mean.aspx

Q: Can VMM be installed inside a VM?
A: Installing VMM in a virtual machine is a fully supported scenario.  Consider the flexibility of the VM (snapshots, live migration) but also consider moving the VMM Library share(s) out of the VM (for growth and performance reasons). Also exclude the VM from receiving and acting on PRO-tips.
More information: http://blogs.technet.com/mbriggs/archive/2009/05/22/should-vmm-live-inside-a-vm-or-on-a-physical-server.aspx

Q: Can I reduce the number of VMM PS task/jobs that are kept in the VMM database?
A: Yes, just configure the TaskGC (DWORD) in “HKLM\Software\Microsoft\Microsoft System Center Virtual Machine Manager Server\settings\SQL” to the number of days you want to keep.
More information: http://blogs.msdn.com/robertvi/archive/2009/05/25/scvmm-service-may-take-up-lots-of-memory.aspx

Q: Can I share (remote) ISO files in VMM with Hyper-V?
A: Yes, use constrained delegation to enable the CIFS protocol to be accessed on your library server by the Hyper-V host(s) and use a domain account as VMM service account.
More information: http://blogs.technet.com/m2/archive/2009/08/15/how-to-properly-share-iso-files-in-vmm-with-hyper-v.aspx

Q: Can I backup the VMM database?
A: Yes, using both GUI and/or CLI. Using the VMM Administrator console or using the VMM PowerShell cmdlet called “Backup-VMMserver”
More information: http://technet.microsoft.com/en-us/library/bb963730.aspx

Q: What’s the difference between “Maintenance Mode” and “Host is unavailable for Placement” option at the VMHost?
A: When you start the “Maintenance Mode” on a VMHost, all VMs are (live) migrated away from that VMHost (where possible – otherwise State is Saved ). Making a VMHost “unavailable for placement” would also exclude the VMHost (eg: Offline Servicing Host) from the star rating used by the “intelligent placement”, but would leave the VMs running on it unharmed.
More information: http://blogs.technet.com/chengw/archive/2009/03/18/what-you-need-to-know-about-maintenance-mode.aspx

Some more VMM Frequently Asked Questions from TechNet

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# System Center Virtual Machine Manager Documentation « IT Core Blog

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# Virtual Machine Manager (VMM) Q&A – Part 2

Q: What is the option “Enable spoofing of MAC addresses” on a virtual network adapter? A: A virtual network

# VMM : Q&A Part 3

vrijdag 10 september 2010 9:23 by Windows Server 2008 (R2) blog by Kurt Roggen [BE]

Q: How to remove a missing VMs from the VMM Administrator Console? A: You will have to do some cleanup