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Exchange 2010 Database Size Recommendations

Posted on 2014-09-26
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Last Modified: 2014-10-10
I've been searching for awhile trying to determine if there is a recommend mailbox database size recommendation.  I know in 2003 the recommendation was 100 GB and in 2007 in a CRC environment it was 200 GB.  In 2010  the max database size is 2 TB when deployed in a DAG environment with 2 passive copies.  What is the recommendation in a non  DAG environment?

What are the recommendations if any for 2010 in a DAG environment?  Is it basically it depends based on recoverabilty objectives such as how long it would take to ressed a copy, how long to apply logs to a newly activated copy, etc up to 2 TB.  I've been in environments where we have 1 TB databases and others where we didn't want to exceed 400 or 500 GB.
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Question by:georgedschneider
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Simon Butler (Sembee) earned 500 total points
ID: 40347337
There isn't a recommendation. Simple as that.

The usual model is around 250gb, as that provides a good trade-off between having lots of small databases and having a database that takes too long to backup/restore. On a DAG that is about the most I would go to because of seeding times etc. If the copy is off site then the size may well be smaller.

However I have seen larger, with the client happy to take the impact.

Personally I would prefer to max out the databases on a standard edition server, with one spare for recovery purposes. Then spread the load. If that means I end up with three 40gb databases then that is fine by me.

Simon.
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by:georgedschneider
ID: 40361281
Our user mailboxes tend to be on the large size between 10-20 GB.  So I'm debating between the 250 may not be feasible or would give us many db's may make management a little more complicated.


What is the maximum number of databases exchange can have?  I'm thinking of redesigning a few aspects around our databases.  Our DAG databases are from 200 GB to 500 GB which I can live with as reseeding times would be acceptable at this size for the business.  Moving forward I'd create more databases not exceeding 500.

We have a standalone exchange server that holds our native exchange archive databases that I'm thinking of joining to the DAG.  On this server the databases are between 600-800 GB.  In the short terms I'm thinking a creating new databases that are at most 250 until they are incorporated into the DAG.  Once in the DAG making 500 GB the max size.  

Would the 250 typical model apply to Archives as well.

Also does the 2 TB maximum apply to archive db's as well.
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by:Simon Butler (Sembee)
Simon Butler (Sembee) earned 500 total points
ID: 40361312
Databases are databases - doesn't matter if it is an archive database or a mailbox database. They are just the same. All that is different is your terminology, as you can place an archive database anywhere you like.

Maximum of five databases in standard edition of Exchange 2010, four if you have public folder database.
Enterprise edition gives you 100 databases.

Simon.
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