DAG for site resillience

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J

JohnBravo



Hi Guys,

I am looking at implementing a DAG across two physical sites to offer site resillience with two MB servers in one site and one (or two) in the other. My problem is I am not sure what would happen if the site to site link was to become unavilable and the servers in one site couldnt contact the witness server?

Are there any options that would allow me to specifiy another parameter to check so that the mailbox copies do not failover to the other site and become available for the users at one site? Ie can I tell the DAG to check if it can ping the other server, for example in the site before the DAG brings the databases up at the other site.

Any pointers on this would be very well received.

Thanks

John
 
L

lAdK



just noticed this was a double post so here is my answer (again)

DAG does not support link failures so any site failure will yield the site with the smaller number of nodes to lose quorum

the best you can do is to disable automatic failover but this will not change anything to the fact that the servers will lose quorum and will be dismounted they just won't go online in the other site


Full time IT consultant since 1998 mainly on Exchange\ISA\AD MCSE NT4.0,2000/2003, CCNA MCITP: Enterprise Messaging Administrator 2007/2010 MCT since 2001
 
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