advice on exchange 2013 deployment

we are currently using exchange 2010 sp3
are server environment is virtual
we are using kemp load balancers
I need advice on migrating to 2013
we have around 1800 mailboxes on 1 exchange 2010 server running all roles
should we just install 2 new 2013 servers running all roles in a dag through load balancers
or should we build out say 4 servers
2 cas servers and 2 mailboxe servers in a dag
or 2 cas servers and 4 mailbox servers
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dougdogAsked:
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Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

Providing such guidelines would be difficult it would be great if you use the exchange calculator wizard to know how many servers you need in this case. Because even if you doing the migration the number of servers which will be needed based on several parameters therefore it would be great if you go through the sizing guide

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

Thanks
Manikandan
dougdogAuthor Commented:
the calculator asks
number of servers hosting active mailboxes
number of database availability groups
number of lagged databases etc etc
this is why im asking the question because im looking advice on what the best type of deployment would be for 1800 users
Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

According to my understanding 2 CAS Servers along with 2 mailbox servers should work. In-case if your planning to combine roles then you need to refer the guidelines for memory and CPU requirements. If your planning to virtualization of Exchange 2013 then refer the below links

https://technet.microsoft.com/en-us/library/aa996719%28v=exchg.150%29.aspx
https://technet.microsoft.com/en-us/library/jj619301(v=exchg.150).aspx

Thanks
Manikandan
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dougdogAuthor Commented:
Basically what im trying to find out is
would 2 virtual servers with lots of cpu and memory running multiple roles be enough for 2000 users
Is anyone running this or what type of configs are people using for this number of users
Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

For 2000 Users running 2 mailbox Servers with 2 CAS Servers is sufficent. Or you can also combine the server rols into 2. In that case you will require only 2 systems for 2000 users. Please refer the below VMware Sizing for Exchange 2013 and Sizing guide by msexchange.org for the same

http://www.vmware.com/files/pdf/Exchange_2013_on_VMware_Design_and_Sizing_Guide.pdf
http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/exchange-2010-sizing-cheat-sheet.html
http://www.msexchange.org/articles-tutorials/exchange-server-2013/planning-architecture/exchange-2013-sizing-cheat-sheet-part2.html

Thanks
Manikandan
dougdogAuthor Commented:
so 2 servers possible even 3 running 1 dag would be plenty
Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

Yes 3 servers running in one DAG is enough for 2000 users. However if users increase in future then you may encounter performance issues and then you may need to add more servers or add memory & CPU to existing servers. For future reference i would recommend you go through the sizing guide please

Thanks
Manikandan

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