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Exchange 2013 CAS Server Windows NLB RRS feed

  • Question

  • Hi.

    I want to configure 2 new the Exchange 2013 CAS servers with Windows NLB.

    But what is best practice regarding the use of Windows NLB?

    My Network Experts says i cannot use unicast for NLB due to the current Network gear/configuration.

    So then i want to know whats best practice regarding Exchange 2013 CAS Windows NLB with IGMP Multicast?

    Do i need 2 Network adapters on each CAS server, and may both Network adapters register in dns and get enabled netbios setting?

    Best Regards
    Advizor


    Advizor Hosting, Microsoft Partner

    Wednesday, January 27, 2016 12:30 PM

Answers

  • Thank you for the reply.

    I've read up on the Kemp Loadmaster Free, but it only supports up to 50 TPS.

    We are Hosting Exchange for 600 mailbox users, i'm not sure the free version of Kemp would be enough?

    I'm not sure how many connections a single Outlook Client and Active Sync device is using?
    And i'm not sure if we are going to reach some bottelneck experience when most users are logging in a narrow timespan for 1-2 hours.


    Advizor Hosting, Microsoft Partner


    As long as you have sized the servers correctly, you will be fine on the back end.

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

    The free Kemp limit is limited on throughput, but with only 600 users, you can certainly estimate it with the avail bandwidth calc:

    https://gallery.technet.microsoft.com/Exchange-Client-Network-8af1bf00

    Biggest advantage of using a true LB is that you will be able to consolidate the Exchange roles CAS/MBX and build a DAG if needed.


    Blog:    Twitter:   

    Wednesday, January 27, 2016 2:29 PM
    Moderator

All replies

  • Windows NLB is not recommended, but can be done. For cheap software LBs, see Kemp.

    For your specific question, multicast implies only one NIC per node, ( Unicast requires 2 NICS to account for the heartbeat network)  but you will need to add an ARP entry typically on the router in front of the NLB cluster.

    Example:

    http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006558


    Blog:    Twitter:   



    Wednesday, January 27, 2016 12:35 PM
    Moderator
  • Thank you for the reply.

    I've read up on the Kemp Loadmaster Free, but it only supports up to 50 TPS.

    We are Hosting Exchange for 600 mailbox users, i'm not sure the free version of Kemp would be enough?

    I'm not sure how many connections a single Outlook Client and Active Sync device is using?
    And i'm not sure if we are going to reach some bottelneck experience when most users are logging in a narrow timespan for 1-2 hours.


    Advizor Hosting, Microsoft Partner


    Wednesday, January 27, 2016 1:18 PM
  • Thank you for the reply.

    I've read up on the Kemp Loadmaster Free, but it only supports up to 50 TPS.

    We are Hosting Exchange for 600 mailbox users, i'm not sure the free version of Kemp would be enough?

    I'm not sure how many connections a single Outlook Client and Active Sync device is using?
    And i'm not sure if we are going to reach some bottelneck experience when most users are logging in a narrow timespan for 1-2 hours.


    Advizor Hosting, Microsoft Partner


    As long as you have sized the servers correctly, you will be fine on the back end.

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

    The free Kemp limit is limited on throughput, but with only 600 users, you can certainly estimate it with the avail bandwidth calc:

    https://gallery.technet.microsoft.com/Exchange-Client-Network-8af1bf00

    Biggest advantage of using a true LB is that you will be able to consolidate the Exchange roles CAS/MBX and build a DAG if needed.


    Blog:    Twitter:   

    Wednesday, January 27, 2016 2:29 PM
    Moderator