jason_jm
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Exchange 2010 3 server multi site wan DAG advice
Hey all, I have been messing with exchange 2010 DAG, tryna work out the ins and outs.
I have the following setup
1 Exchange server A, site A , live users
1 Exchange server B, site B, Â live users
1 Exchange server C, site C, no live users
My goal is as follows:
1) setup 3 server DAG, replicate server A to C (active passive) and B to C (active passive) - this part I know how to do
2) make sure that servers NEVER fail over without human intervention, example server A can never dismount its stores without being ordered to do so by a person, server C can never make a passive dbase active without a human order. How do I setup a dag to behave like this?
3) In a 3 server setup for DAG, apparently I do not need the witness server, but initially when I created the DAG with first 2 servers, it made a witness server, how do i get rid of witness server? or will exchange just ignore it?
4)lets say power goes out in exchange site A, I manually bring the dbase online in site C, and users connect to site C and use email. Now power comes back on in site A and exchange server turns on. Will exchange server in site A contact site B and C and see that dbase is active in site C and not mount? or do i risk the split brain thing?
What problems that I do not understand or foresee do I risk with a setup like this?
I have the following setup
1 Exchange server A, site A , live users
1 Exchange server B, site B, Â live users
1 Exchange server C, site C, no live users
My goal is as follows:
1) setup 3 server DAG, replicate server A to C (active passive) and B to C (active passive) - this part I know how to do
2) make sure that servers NEVER fail over without human intervention, example server A can never dismount its stores without being ordered to do so by a person, server C can never make a passive dbase active without a human order. How do I setup a dag to behave like this?
3) In a 3 server setup for DAG, apparently I do not need the witness server, but initially when I created the DAG with first 2 servers, it made a witness server, how do i get rid of witness server? or will exchange just ignore it?
4)lets say power goes out in exchange site A, I manually bring the dbase online in site C, and users connect to site C and use email. Now power comes back on in site A and exchange server turns on. Will exchange server in site A contact site B and C and see that dbase is active in site C and not mount? or do i risk the split brain thing?
What problems that I do not understand or foresee do I risk with a setup like this?
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Auric1983
Also Jason, when your DAG at Site C comes active, it begins queing up the transaction logs to send back to Site A when it comes back online, and it will only switch back once the logs have been sent and replayed.
Sorry Auric1983 the DAG will never failback alone however the issue is that the site might go up before the link and lead to split brain if DAC mode is not activated
ah! that makes sense,
I should know only to open my mouth to change feet... :P
ASKER
to turn them off switches are unrestricted and off