Defines the set of possible DFS target priority class settings.

Syntax

typedef enum  { 
  DfsInvalidPriorityClass         = -1,
  DfsSiteCostNormalPriorityClass  = 0,
  DfsGlobalHighPriorityClass      = 1,
  DfsSiteCostHighPriorityClass    = 2,
  DfsSiteCostLowPriorityClass     = 3,
  DfsGlobalLowPriorityClass       = 4
} DFS_TARGET_PRIORITY_CLASS;

Constants

DfsInvalidPriorityClass

The priority class is not valid.

DfsSiteCostNormalPriorityClass

The middle or "normal" site cost priority class for a DFS target.

DfsGlobalHighPriorityClass

The highest priority class for a DFS target. Targets assigned this class receive global preference.

DfsSiteCostHighPriorityClass

The highest site cost priority class for a DFS target. Targets assigned this class receive the most preference among targets of the same site cost for a given DFS client.

DfsSiteCostLowPriorityClass

The lowest site cost priority class for a DFS target. Targets assigned this class receive the least preference among targets of the same site cost for a given DFS client.

DfsGlobalLowPriorityClass

The lowest level of priority class for a DFS target. Targets assigned this class receive the least preference globally.

Remarks

The order of priority classes from highest to lowest is as follows:

• DfsGlobalHighPriorityClass
• DfsSiteCostHighPriorityClass
• DfsSiteCostNormalPriorityClass
• DfsSiteCostLowPriorityClass
• DfsGlobalLowPriorityClass

Server targets are initially grouped into global high priority, normal priority, and low priority classes. The normal priority class is then subdivided, based on Active Directory site cost, into site-cost high priority, site-cost normal priority, and site-cost low priority classes.

For example, all of the server targets with a site-cost value of 0 are first grouped into site-cost high, normal, and low priority classes. Then, all server targets with lower site costs are likewise separated into site-cost high, normal, and low priority classes. Thus, a server target with a site-cost value of 0 and a site-cost low priority class is still ranked higher than a server target with a site-cost value of 1 and site-cost high priority class.

For more information about how server target priority is determined, see DFS Server Target Prioritization.

Requirements

See also

DFS Server Target Prioritization

Send comments about this topic to Microsoft

Build date: 10/26/2012