When talking about the new High Availability features in Exchange 2010 an often recurring question is “How many mailbox databases can you home on an Exchange 2010 Standard Edition?”
The answer is listed here: Looking at the On-Premise Licensing for Exchange Server 2010, and for a Standard Edition you are limited to 5 and for an Enterprise edition you are limited to 100:
I’ve got a DAG, called DAG1, which includes two servers: E2010CHM1, and E2010MU2. I’ve created a few mailbox databases as you can see in the picture below:
The following databases are mounted on E2010CHM1:
And the following mailbox databases are mounted on E2010MU2:
Now let’s try to add a mailbox database copy for the mailbox database BHV, so it will be available as a passive database copy on E2010CHM1.
Here’s the result:
Exchange 2010 Standard Edition is limited to a maximum database limit of 5 (which is the sum of active and passive database copies, and the public folder database!)
Good article! An important side note - you must use Windows 2008 ENTERPRISE to utilize DAG.
True, and there are more sidenotes to DAG, like the fact that Public Folders can not take advantages of DAG, you still need to use Public Folder replication mechanism! But a pubic folder database can be homed on a server, who is a member of a DAG :-)
And what about Personal Archive databases in SP1? Five databases is the limit for the sum of active, passive, public folder and personal archive databases?
So, if i got it right, there is a limit of 5 databases per server. Does that mean that if you had tried to add the copy to the other server (the one with only 2 databases) would it have been successful?
NOPE !!! FAIL!!!
5 Databases PER Server !!!
look here: technet.microsoft.com/.../bb232170.aspx
In Your Scenario you already have 5 Databases on E2010CHM1 !!!
It looks like the 'Soleil' db is already part of a DAG(?)
Also, if you had attempted to add 'Employees' to your DAG would it have worked (since server 2 has less than 5 databases)?
I have a question that is related - 2 Std edition with 5 databases each - 2 Active - 2 passive and 1 PF each (5 DB per server) what about adding a 3rd Enterprise server and creating a 3rd copy of each database on the enterprise. I am virtually sure this is fine as the Ent server is not attempting to copy anything back to either std servers.
I have a question, if I have standard edition of exchange 2010 how many user mailboxes can I create?