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Fence Value    

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Fence Value


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Apr
09

Fence Value

 

DFSR uses fence values to ensure that the correct version of a resource (file or folder) is replicated where there is a conflict. The fence values are also used in initial sync where the versions on the primary member override versions on the non-primary member. Note that copying the same file without the knowledge of DFSR (such as using xcopy) to its members prior to starting DFSR on the non-primary member (as is done for seeding) will result in the version on the upstream partner overwriting the version on the non-primary member. If the file hashes are identical, the file is not downloaded; otherwise, RDC is used to download the changed portions of the file. If the file was updated on the non-primary member while it is in initial sync state then the file is in conflict with its partner (update conflict) and the file will be moved to the Conflict and Deleted folder where RDC is still used.

 

The fence values for resources are used to guarantee predictable outcomes from conflict resolution.

 

-          A version of a resource with a normal fence value takes precedence over versions with initial-primary and initial-sync fence values.

-          A version of a resource with an initial-primary fence value takes precedence over versions with an initial-sync fence value.

-          If two versions have the same fence value, the conflict is resolved using first create time, then last modified time.

-          A newly created file has a default fence value.

-          A file can also be unfenced, which guarantees that it will lose on conflict.

-          Time stamps can also be used as fence values; in this case, the version with the highest time stamp takes precedence over other time stamps or fence values.

 

Fence Value

DFSR uses fence values to ensure that the correct version of a resource (file or folder) is replicated where there is a conflict. The fence values are also used in initial sync where the versions on the primary member override versions on the non-primary member.

 

 

 

As taken from: http://msdn.microsoft.com/en-us/library/bb540026(v=vs.85).aspx

 

Fence Values

The fence values for resources are used to guarantee predictable outcomes from conflict resolution.

  • A version of a resource with a normal fence value takes precedence over versions with initial-primary and initial-sync fence values.
  • A version of a resource with an initial-primary fence value takes precedence over versions with an initial-sync fence value.
  • If two versions have the same fence value, the conflict is resolved using first create time, then last modified time.
  • A newly created file has a default fence value.
  • A file can also be unfenced, which guarantees that it will lose on conflict.
  • Time stamps can also be used as fence values; in this case, the version with the highest time stamp takes precedence over other time stamps or fence values.

 

 

 

 

 

 

 

 

 

 



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