My current setup is:
Exchange 2007 CCR (Shared Storage). Approx 3000 Mailbox and the DB size is 1.63 TB (SG - I) and 645 GB (SG - II)
HUB + CAS -> (Windows NLB x 2 Physical Servers) (1 Virtual Host) (Sun Blade x6250, 2* Intel x5270 dual core, 16 GB RAM, 300 GB HDD)
Mailbox x2 physical servers -> Failover Cluster (1 Virtual Host) using Sun shared storage (2* Six core AMD 8345, 16 GB RAM, 300 GB Internal HDD, mapped shared storage)
We are planning to migrate to Exchange 2010 with complete new set of H/W & storage.
The new design will be:-
1) HUB + CAS:- Total 3 Physical Servers
2) Mailbox (DAG): Total 4 Physical Server
3) 2 Hardware NLB's which will balance the traffic for HUB & CAS Server
I want suggestions on SCOPE of this upgrade from 2007 to 2010 which i can share with my consultant who is proposing this.
Still trying to figure out the proper usage of this CALC as what i was thinking of suggesting the client is:-
1) 3 Servers + HWNLB (HUB & CAS)
2) 4 Server for Mailbox (DAG) role with dedicated storage
As the client wants no down time or minimal downtime. With this requirement in place, i was thinking to keep 3 mailbox servers in DAG with one server as Lagged copy in any kind of corruption. So the 3 live servers will load balance as i was thinking of mounting the DB's on different servers in order to have maximum through put and availability
Still i think that there is something missing in this design or is not proper. On a second note i wanted to ask, this CLAC doesn't asks for any input related to HUB & CAS Servers it only asks to input for DB servers or may be i have not yet properly used this?
That would do, The calc is primarily for mbx servers. HUB's are load balanced for internal messages without any special config needed, the CAS Server you would need to create a CAS Array and use a software (WNLB) or hardware solution. It's nor recommended to use WNLB any more.
As for the distributions of the DB across the 3 Nodes, it's fine.
As for HA/DR, look good if you have one AD site.
Yes i will not use WNLB, i will use a H/w LB for this solution.
HUB & CAS roles will be installed on all the three server which will sit behind this H/W LB. Yes i have one site only, and neat future i do not see a second site coming up pretty soon...