Areas for High Availability
- XenDesktop Servers
- Provisioning servers
- vDisk store - central file share, SAN w cluster FS, SAN w read/only access, Replicated local storage
- Logon servers and TFTP (DNS Round Robin, Citrix Recommends Access Gateway)
- DHCP (cluster, 2 scopes, ...)
- Database
- Hypervisor
- Web Interface Servers (IIS Farm)

Active Directory XenDesktop Controller discovery
start PowerShell (if not enabled > Set-ExecutionPolicy remotesigned)
cd "c:\program files\citrix\broker\service\Setup Scripts"
.\Set-ADControllerDiscovery.ps1 -on -existingOuDn "ou=XenDesktop OU, dc=domain, dc=com"
restart Citrix Broker Service on all DDCs (Desktop Delivery Controller)
check AD has created Controllers security group, Farm SCP point and RegistrationServices container

Switch agents to use Active Directory
go to virtual machine, open command prompt, cd C:\Program Files\Citrix\XenDesktopVdaSetup
run XenDesktopVdaSetup.exe /reconfigure and select site from AD
for more info - http://support.citrix.com/proddocs/topic/xendesktop-rho/cds-metainstallervdaexe-rho.html

Configure Addtional PVS Servers
install the server and run Provisioning Services Configuration Wizard
join existing farm, SQL server browser needs to be running and set to automatic & Named Pipes enabled
add server ip to the Stream Server Boot List

PVS Server Power Rating - Farm > Sites > Site > Servers - server properties
PVS vDisk load balancing - Farm > Stores > Store vDisk - load balancing ...
if the replication is set up - Farm > Sites > Site > vDisk Pool - vDisk - Replication Status