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# DAG in exch 2010

Posted on 2010-09-03
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Hello,

Is DAG dependent on some majority of nodes. If yes plese help me understand this.

Thanks
Sujith
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Question by:YogeshSLK
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endital1097 earned 500 total points
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yes, a dag must always have an odd number of node (at least three) and the majority of those nodes must remain in communication for the cluster (DAG) to remain online
the more members the more "downed" nodes you can survive
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If i have 6 mailbox servers and one witness server then at what point the DAG can fail ?
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endital1097 earned 500 total points
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3 servers could fail
7 node cluster
you can always fail (x-1)/2 node failure

(7-1)/2 = 3 :)
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Thanks for the assistance...
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What in case if i have 5 mailbos servers.... then you 2 can and still DAG will be working and in case 3rd fails DAG will fail...
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What in case if i have 5 mailbox servers.... then you mean to say 2 can fail and DAG will still be working and in case 3rd fails DAG will fail... Right ???
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yes, just use the formula
x = the number of servers in the dag

(x-1) divided by 2
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then iun that if i have 6 servers in DAG how that formula works ????
(6-1)/2 == 5/2=2.5 ????
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you can never have an even number
when there is an even number of mailbox servers then active manager adds a file share witness to make it an odd number
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Great... :)
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