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2 Servers with Multi Role RRS feed

  • Question

  • HI,

    I am planning to have 2 Exchange 2013 Servers with Multi Role ,DAG for High Availability. I don't have Load Balancer So how i will configure CAS on Multi Role. In Exchange 2010 We can create CAS array but I heard CAS array is not supported in 2013.

    Any Ideas ?

    Regards

    Usman


    Usman Ghani - MCITP Exchange 2010

    Thursday, November 26, 2015 11:55 AM

Answers

  • Hello,

    In Exchange 2013 CAS high availability requires to configure layer 4 load balancing. CAS Array is no longer needed because all client connections are made using Outlook Anywhere (and/or MAPI/HTTP in Exchange 2013 SP1). You can use:

    1. DNS Round Robin - it isn't true high availability solution. It can be used for very simple deployments when you cannot use any better solutions.

    2. Windows Network Load Balancing feature - requires separate CAS servers because it cannot be co-located with DAG members.

    3. 3rd party load balancers (hardware or virtual appliances) - the best solution. Offers the best performance and the largest number of features. You can use any product certified for Exchange, i.e. Kemp.


    My LinkedIn profile

    • Proposed as answer by Prem P Rana Thursday, November 26, 2015 4:48 PM
    • Marked as answer by jim-xu Tuesday, December 8, 2015 9:17 AM
    Thursday, November 26, 2015 12:01 PM
  • DNS round robin works pretty well for internal use, but most of the time smaller organizations don't have multiple external IP addresses to do DNS round robin for the external stuff.

    Windows NLB is not an option if you are using a DAG on those servers.

    If you are cost conscious, I'd look at free virtual load balancers:


    Byron Wright (http://fieldnotes.conexion.ca)

    • Proposed as answer by Prem P Rana Thursday, November 26, 2015 4:48 PM
    • Marked as answer by jim-xu Tuesday, December 8, 2015 9:17 AM
    Thursday, November 26, 2015 2:36 PM

All replies

  • Hello,

    In Exchange 2013 CAS high availability requires to configure layer 4 load balancing. CAS Array is no longer needed because all client connections are made using Outlook Anywhere (and/or MAPI/HTTP in Exchange 2013 SP1). You can use:

    1. DNS Round Robin - it isn't true high availability solution. It can be used for very simple deployments when you cannot use any better solutions.

    2. Windows Network Load Balancing feature - requires separate CAS servers because it cannot be co-located with DAG members.

    3. 3rd party load balancers (hardware or virtual appliances) - the best solution. Offers the best performance and the largest number of features. You can use any product certified for Exchange, i.e. Kemp.


    My LinkedIn profile

    • Proposed as answer by Prem P Rana Thursday, November 26, 2015 4:48 PM
    • Marked as answer by jim-xu Tuesday, December 8, 2015 9:17 AM
    Thursday, November 26, 2015 12:01 PM
  • DNS round robin works pretty well for internal use, but most of the time smaller organizations don't have multiple external IP addresses to do DNS round robin for the external stuff.

    Windows NLB is not an option if you are using a DAG on those servers.

    If you are cost conscious, I'd look at free virtual load balancers:


    Byron Wright (http://fieldnotes.conexion.ca)

    • Proposed as answer by Prem P Rana Thursday, November 26, 2015 4:48 PM
    • Marked as answer by jim-xu Tuesday, December 8, 2015 9:17 AM
    Thursday, November 26, 2015 2:36 PM