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Exchange 2013 - 2 multirole Exchange Servers with balancer vs 4 Exchange Servers (2 CAS & 2 Mailbox)

    Question

  • Hi!

    I am evaluating 2 HA configurations

    1) 2 multirole Exchange Servers with DAGs for Mailbox role and a balancer for CAS role (hardware or software balancer).

    2) 4 Exchange Servers, 2 of them with CAS Role and NLB to implement load balancing, and the other 2 with Mailbox Role with DAGs.

    What are the pro and cons about these 2 options?

    What is the best option? I know that 4 Exchange Servers is the best for automatic disaster recovery and the best for planned maintenance. But is there anything else as a pro?

    thanks


    Cristian L Ruiz

    Tuesday, November 19, 2013 2:59 AM

Answers

  • Hello,

    Based on the first environment, you don't use software balancer. But you can use hardware or software balancer for the second environment.

    And if your Exchange Organization is smaller, you could combine the Mailbox and CAS role on the same server.

    If you take consider into Cost of hardware, Cost of maintenance and so on, the first choice is best for you.

    If you have any feedback on our support, please click here



    Cara Chen
    TechNet Community Support


    Wednesday, November 20, 2013 7:22 AM
  • Hi

    1) This would be the recommended solution if these are your only options.  Depending on the costs for your load balancer solution it may work out cheaper due to licensing only 2 servers instead of 4.

    Using 4 multirole servers is better for high availability because they can all hold copies of your databases, in both of your options you only have 2 mailbox servers so neither choice would improve HA.

    Steve

    Wednesday, November 20, 2013 8:03 AM

All replies

  • Hello,

    Based on the first environment, you don't use software balancer. But you can use hardware or software balancer for the second environment.

    And if your Exchange Organization is smaller, you could combine the Mailbox and CAS role on the same server.

    If you take consider into Cost of hardware, Cost of maintenance and so on, the first choice is best for you.

    If you have any feedback on our support, please click here



    Cara Chen
    TechNet Community Support


    Wednesday, November 20, 2013 7:22 AM
  • multi role servers cannot be used for Loadbancer.
    Wednesday, November 20, 2013 7:28 AM
  • Hi

    1) This would be the recommended solution if these are your only options.  Depending on the costs for your load balancer solution it may work out cheaper due to licensing only 2 servers instead of 4.

    Using 4 multirole servers is better for high availability because they can all hold copies of your databases, in both of your options you only have 2 mailbox servers so neither choice would improve HA.

    Steve

    Wednesday, November 20, 2013 8:03 AM