Exchange 2010 Databases

Which is better

Having a database for the entire company or multiples databases by department (Sales, Support, IT)
PLCITSAsked:
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Satyendra SharmaMicrosoft UC Technical ArchitectCommented:
It depends,

How many mailboxes in all?
Do you want to manage the users department wise or don't care?
Splitting database gives administrator more control and in the event of database outage entire company is not impacted.
Is HA a requiremend... DAG?
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Satyendra SharmaMicrosoft UC Technical ArchitectCommented:
Also i highly recommend to use the Storage calculator which will tell you depending on the input how many database to split the environment into along with the number of users.

http://blogs.technet.com/b/omers/archive/2011/01/20/updated-exchange-2010-storage-calculator-v14-1.aspx

Other articles to look at as well:-
http://technet.microsoft.com/en-us/library/dd876874(v=exchg.141).aspx
http://technet.microsoft.com/en-us/library/ee832792(v=exchg.141).aspx
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PLCITSAuthor Commented:
We have 650 and can grow up more, yes i want more control, in case something happen with one database i dont want stop all company is not a DAG requirement

you think split is good idea?
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Satyendra SharmaMicrosoft UC Technical ArchitectCommented:
You need to use the calculator and punch the details, and see what it comes out with and then think about what kinda HA/DR do you want for your email environment.

http://technet.microsoft.com/en-us/library/dd638121(v=exchg.141).aspx
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Adam FarageEnterprise ArchCommented:
As Satyendra said, we cannot provide you the answer. Technically speaking the supported size of a database is 16TB, but the recommendation is not to go above 2TB for a DAG copy or 250GB for a non-DAG copy. These sizes come from MS and is due to the amount of time to recover a database of this size.

You should read through the Exchange Role Calculator and figure what is best for your organization based off that output. That is the recommendation from Microsoft.
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