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Problem opening the same file in branches and matrix (DFS)

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We have the following situation :

We have a matrix that we will call LojaM and 2 branches that we call LojaSP which is in Sao Paulo and a LojaRJ which is in Rio de Janeiro .

We as file distribution DFS between them . In each location we have allocated files , which are replicated among themselves by DFS , except that each uses the file directory of your drive , it would not make sense to use the files from LojaSP LojaM , because it would use internet bandwidth .

The problem that the DFS is not opening files . So to understand , below the file structure on the servers of each unit mapped .

LojaM : User maps here : \ \ lojaM \ files \ finance \

LojaSP : User maps here : \ \ lojaSP \ files \ finance \

LojaRJ : User maps here : \ \ lojaRJ \ files \ finance \

In this case the files in these folders are replicated to each other by DFS , but since the path is the same, only changing the source ( in this case the server ) , you can open the same file in another location , because DFS does not perform treatment of open files .

So I have the file in the DFS financeiro_dados.xml units \ files \ finance \

What should happen if I open this file there 's LojaSP , to be in the same folder replication units , he should prevent another user had the ability to open the file . In this case the opposite happens , the user opens the file LojaSP financeiro_dados.xml , and the user opens the same file LojaM financeiro_dados.xml . Hence the two are editing at the same time , the last to save overrides to change the other .

Because then the units do not map to the same location ? Why give would be consuming high bandwidth internet / network to access a file that is allocated to your unit .

I wanted to find a solution that would make the distribution of files between drives and also took control of the files , so if someone LojaSP financeiro_dados.xml open the file , other users and LojaM LojaRJ would be prevented if you change the file financeiro_dados.xml because it is already open in LojaSP .

Do not know if it understood the situation , if not more , can explain otherwise .

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