Exchange 2013 DAG questions

Is a DAG better with administrative access point or without
My backup software requires that I have one or else the only way to backup is to backup each node
is the best method to backup the passive node each night
how many DAGs can I have?
How many databases per DAG
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dougdogAuthor Commented:
I have 2 nodes with all roles installed going through a load balancer
around 2000 users
Miguel Angel Perez MuñozCommented:
Usually when dag members are replicated on real time (without lag) backup uses passive copy. This is for not disturb active database. But you can do using active or passive.

You can have all dags you want, but one server can be member of one dag at same time (or stand alone).
About limit, Exchange can have mounted 50 databases, I thinks this is limit for a DAG.

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dougdogAuthor Commented:
Is an iP less Dag  the way forward?
And if the Dag fails over I just backup the other node
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AmitIT ArchitectCommented:
Why don't you run it without backup. With DAG you can easily run your Exchange environment without any backup. I am running DAG without any backup. However, I have 5 copy for each DB with one DR site.

As far as your question about DAG. Taking Passive DB copy avoid performance impact for users. Secondly, if DAG fails or db switch over to another server, are two different concepts. I assume you are saying, if DB failover to another server, can you take the backup, you can sure take the backup.

IP less DAG read this :
Jeff GloverSr. Systems AdministratorCommented:
We run a passive only server just for backups (regulatory requirement or I wouldn't do backups either) for IPLess DAG, check with your Backup Software. Some do not handle IP Less DAGs well.
dougdogAuthor Commented:
how to you build a passive only server?
AmitIT ArchitectCommented:
What do you mean by build Passive Server?  Servers are not in passive mode.

It is your DB which will be in passive state as per activation preference. It will be showing as healthy state.
Jeff GloverSr. Systems AdministratorCommented:
It is a normal exchange server but I only installed the mailbox role. Added it to the DAG and made sure it had copies of all the databases but they were the last in the list for preference. You can also set the server not to activate the copies by running
Set-Mailboxserver -identity "servername" -databasecopyautoactivationpolicy Blocked

This keeps replication going but prevents the copies from being activated. It is a little extreme. I normally leave it unrestricted since I have 3 servers above it in preference for all the dbs and actively monitor databases.
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