In Windows Server 2008 R2, Hyper-V can support up to 384 virtual machines (VMs) as long as the number of virtual processors assigned to those VMs do not exceed 512. These numbers change a bit if you are running Hyper-V in a Failover Cluster. You can only support 64 VMs per node of the cluster. Since all business critical applications and services need to have a fault-tolerant solution, you will more than likely be running your VMs on a Failover Cluster. So, for the production environment, I would say 64 VMs is the limit.
AD LDS allows you to provide directory services to applications that are free of the confines of Active Directory. To list all the AD LDS instances on a server, follow this procedure: Log into the server in question Open a command prompt. Type dsdbutil and press Enter Type List Instances and press Enter . You will receive a list of the instance name, both the LDAP and SSL port numbers, the location of the database, and its status.
Comments
http://hyper-v.nu/blogs/hans/?p=246
Hans Vredevoort
Cluster MVP