?
Solved

DAG in exch 2010

Posted on 2010-09-03
11
Medium Priority
?
579 Views
Last Modified: 2012-06-27
Hello,

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

Thanks
Sujith
0
Comment
Question by:YogeshSLK
  • 6
  • 4
11 Comments
 
LVL 3

Expert Comment

by:SangramGohil
ID: 33595287
0
 
LVL 32

Accepted Solution

by:
endital1097 earned 2000 total points
ID: 33595332
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
0
 

Author Comment

by:YogeshSLK
ID: 33595380
If i have 6 mailbox servers and one witness server then at what point the DAG can fail ?
0
Free tool for managing users' photos in Office 365

Easily upload multiple users’ photos to Office 365. Manage them with an intuitive GUI and use handy built-in cropping and resizing options. Link photos with users based on Azure AD attributes. Free tool!

 
LVL 32

Assisted Solution

by:endital1097
endital1097 earned 2000 total points
ID: 33595439
3 servers could fail
7 node cluster
you can always fail (x-1)/2 node failure

(7-1)/2 = 3 :)
0
 

Author Closing Comment

by:YogeshSLK
ID: 33595842
Thanks for the assistance...
0
 

Author Comment

by:YogeshSLK
ID: 33595860
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...
0
 

Author Comment

by:YogeshSLK
ID: 33595868
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 ???
0
 
LVL 32

Expert Comment

by:endital1097
ID: 33595887
yes, just use the formula
x = the number of servers in the dag

(x-1) divided by 2
0
 

Author Comment

by:YogeshSLK
ID: 33595936
then iun that if i have 6 servers in DAG how that formula works ????
(6-1)/2 == 5/2=2.5 ????
0
 
LVL 32

Expert Comment

by:endital1097
ID: 33595952
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
0
 

Author Comment

by:YogeshSLK
ID: 33596202
Great... :)
0

Featured Post

Creating Active Directory Users from a Text File

If your organization has a need to mass-create AD user accounts, watch this video to see how its done without the need for scripting or other unnecessary complexities.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

What is the biggest problem in managing an exchange environment today? It is the lack of backups, disaster recovery (DR) plan, testing of the DR plan or believing that it won’t happen to us.
After a recent Outlook migration from a 2007 to 2010 environment, some issues with Distribution List owners were realized. In this article, I explain how that was rectified.
how to add IIS SMTP to handle application/Scanner relays into office 365.
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
Suggested Courses

601 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question