zingab
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Exchange 2010 DAG
I have an exchagne 2010 server and want to build a second one on my older server, and create a "DAG" , after creating this how will my users connect to outlook, will it need to be adjusted to the cluster IP/Name? also, i would prefer users connecting to my more powerful server, will this be an option. If someone could help me understand this id appreciate it.
thanks,
thanks,
ASKER
so when building my second exchange server what roles will i need, guess i am not understand what Dag is actually dong.
Which roles do you have on your first server?
A DAG simply transports the logs of your mailbox database to the other database server and applies it.
So you have a backup if one of your database servers fails.
But the mailbox servers are not reponsible for the connections of outlook. There you need the server role Client Access.
A DAG simply transports the logs of your mailbox database to the other database server and applies it.
So you have a backup if one of your database servers fails.
But the mailbox servers are not reponsible for the connections of outlook. There you need the server role Client Access.
ASKER
all roles are on one exchange server, its a small environment
In Exchange 2010 clients are not connecting to the mailbox role anymore , it rather connects to the RPC service installed on the Exchange 2010 server.
so when installing the second role you will need a mailbox server role
so when installing the second role you will need a mailbox server role
If you have the Client Access role on the same server as your mailbox server and the mailbox server crashes, a DAG won´t keep your environment running.
You have to set up an alternate Client Access server for the connections of outlook, webapp etc. and you also need another Hub transport server to deliver your mails.
You have to set up an alternate Client Access server for the connections of outlook, webapp etc. and you also need another Hub transport server to deliver your mails.
ASKER
so creating a dag is useless with having all roles on the same server?
slightly disagree, you can have DAG with all of the server roles configured but you will have to use external hardware load balancer to load balance the traffic and provide HA for the CAS/HUB server role.
No it isn´t useless, because you have a funcitonal copy of your database if one server fails.
But you have to make the other roles high available, too.
If you don´t care about your CAS and HUB then you don´t need a DAG.
But you have to make the other roles high available, too.
If you don´t care about your CAS and HUB then you don´t need a DAG.
ASKER
to clarify- so i dont need a dag, but i can just make a fucntion copy of my databse? how would i go about that?
No sorry, you missunderstood what I said.
A DAG copies the database and its contents for you.
This is not done manually.
A DAG copies the database and its contents for you.
This is not done manually.
ASKER
Besides automatica failover, what else am i losing with having all the roles on one server if i create a dag?
If your client access role is not present in case of failure, no client can connect to your mailboxes. WebApp won´t work anymore and also Active Sync.
You won´t be able to send and receive Emails when your Hub server is missing.
You won´t be able to send and receive Emails when your Hub server is missing.
ASKER
would i be able to install all roles on the second server then manually move to them upone failure?
Quite a good question, I haven´t tried this so far.
I think this works, but somewhere deep inside my head I remeber a MS knowledge base article with some limitations to the CAS placement. But right now I can´t find this article.
But keep in mind you have to be careful with the configuration of your server roles.
I think this works, but somewhere deep inside my head I remeber a MS knowledge base article with some limitations to the CAS placement. But right now I can´t find this article.
But keep in mind you have to be careful with the configuration of your server roles.
ASKER
if you happen to locate some info on this shoot it my way, i cannot i have searched...
I´m sorry, I also have to look this up in technet and this issue is far to complex to explain here. So I am out for the moment.
Bye
Bye
ASKER CERTIFIED SOLUTION
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ASKER
Endital, thanks for the reply, is this the only way you see this as possible?
unfortunately for smaller companies, yes, exchange 2010 is limiting for ha
i forgot to mention earlier that you cannot use Windows NLB with Windows Failover Clustering (used by DAG) and that's why it isn't listed as option 3
there is always virtualization, but once again there is cost
i forgot to mention earlier that you cannot use Windows NLB with Windows Failover Clustering (used by DAG) and that's why it isn't listed as option 3
there is always virtualization, but once again there is cost
ASKER
ty for your time!
a DAG is only a cluster of your mailbox databases. Your Outlook clients will connect to your Client Access server and not to your mailbox servers.
A DAG is active-passive, which means that only one database is in use. You as an administrator can set which database is the active one.
Regards,
gustav