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Exchange Server 2013 Database DAG limitation and maximums

Posted on 2013-11-06
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Last Modified: 2013-11-11
Hi People,

In Exchange Serve 2013, what is the maximum recommended DB size ?
and how many DB per Storage Group or per DAG ?

Because in Exchange Server 2007, one database maximum size recommended is 200 GB for CCR cluster mode.
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by:Kash
Kash earned 125 total points
ID: 39627397
The sizing recommendations for Exchange 2010 and 2013 are the same, maximum of 2TB per database.

In 2013, the number of databases you can mount have changed, 5 in Std, but only 50 in Enterprise Exchange 2013. It is 100 in 2010 Enterprise.

some other read here >> http://howexchangeworks.com/2012/11/exchange-2013-enterprise-edition-can-only-mount-50-databases.html
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by:Senior IT System Engineer
ID: 39628830
2 TB :-o

Is that the recommended mailbox database size ?

so that sounds good, because with just 200 GB MB DB limit, I have to create 12+ Mailbox Database and Storage Groups in CCR 2007.
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by:NetoMeter Screencasts
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ID: 39629239
Hi,

You might find helpful the Exchange 2013 Server Role Requirements Calculator v5.9 (not only when figuring out the DB size):

http://gallery.technet.microsoft.com/Exchange-2013-Server-Role-f8a61780


There are no storage groups in Exchange 2013 - since Exchange 2010 the DB is an organization object, not a server one.
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by:Simon Butler (Sembee)
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ID: 39629581
As far as I am aware, there are no recommended sizes.
This is because there are many factors that have to be taken in to account.
If you are using a DAG for example, then if you have a large database of 500gb, and have to reseed it, then you are looking at moving a lot of data to do so.
If you were recovering a backup, a 500gb database is a lot of data to recover.

150-200gb is the usual target size even with the later versions of Exchange because it provides a good trade off between having databases of a decent size and quick reseeds and recoveries. I certainly wouldn't design a platform to use 2tb databases.

Simon.
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NetoMeter Screencasts earned 250 total points
ID: 39630731
The supported and best practice Database sizes are specified here:

Exchange 2013 Storage Configuration Options

in the "Database and log file choices for the Exchange 2013 Mailbox server role" table, and you have Stand-alone and High Availability DB size best practices.

It really depends on your HA configuration and specific requirements.

Jeff Mealiffe (aka the Perf Guy) has a real life example here:

http://blogs.technet.com/b/exchange/archive/2013/05/06/ask-the-perf-guy-sizing-exchange-2013-deployments.aspx
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by:Senior IT System Engineer
ID: 39640876
Thakns all !~
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