rhtyd commented on issue #3554: Guest OS preference isn't working to define 
physical hosts to deploy os types
URL: https://github.com/apache/cloudstack/issues/3554#issuecomment-531002393
 
 
   Investigation: By default, the FirstFitAllocator will try to find and sort 
available hosts by priority and when a host has the OS preference set (by a 
"guest.os.category.id" detail  in host_details) it will have a higher priority 
than other hosts when trying to deploy the VM on a host. However, that does not 
restrict CloudStack/FirstFitAllocator to return and use other hosts, for 
example the priority host with the guest OS preference set may not have enough 
capacity or max. guest limit.
   
   The priority set by the FirstFitAllocator is: Hosts with GPU if GPU is 
required by template/vm > Hosts matching OS preference > HVM requirement 
matching the template or if host has HVM > rest of the hosts.
   

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