Microsoft Exchange

22nd February 2017

in Business

Loadbalancer.org & BenQ Case Study

Posted by Jake Borman 22nd February in Business

BenQ meets user expectations with high-performance Microsoft Exchange platform in Europe With employees spread across ten European countries, BenQ needs to ensure that its email system in Europe delivers high performance and exceptional availability. It installed Loadbalancer.org products as part of a new centralized Microsoft Exchange platform and they work so effectively, they are almost forgotten.

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14th February 2014

in Load Balancing

Load Balancing Exchange 2013

Posted by Rob Cooper 14th February in Load Balancing

Exchange 2013 is Microsoft's latest enterprise level messaging and collaboration server. It has been designed for simplicity of scale, hardware utilization, and failure isolation. This has greatly simplified both the deployment process and the implementation of a load balancer. Exchange 2013 has been consolidated into two roles, these are: the Client Access Server role and the Mailbox Server role. In Exchange Server 2013, there are two basic building blocks – the Client Access Array and the Database Availability Group (DAG). Each provides a unit of high availability and fault tolerance that are decoupled from one another. Multiple Client Access Servers make up the Client Access Array, while multiple Mailbox Servers form the DAG. One of the main differences from Exchange 2010 is that all client connections are made using HTTPS. Outlook clients no longer use RPC to access their mailbox. This is now handled only by RPC over HTTPS (aka Outlook Anywhere). Native RPC is only used for server to sever communication

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14th February 2014

in Load Balancing

Load Balancing Exchange 2010

Posted by Rob Cooper 14th February in Load Balancing

In Exchange 2010, system functionality is split into five server roles (Mailbox, Client Access (CAS), Unified Messaging, Hub Transport (HT) and Edge Transport).  Mandatory roles are Mailbox, Client Access and Hub Transport. The Edge Transport and Unified Messaging roles are optional and depend on the infrastructure and operational requirements. The CAS role does not have any built-in load balancing functionality. The HT role does provide load balancing functionality for server to server mail traffic, but not external SMTP traffic that arrives from other applications or from outside the organization directly to the HT server. Based on this, it is a common requirement to load balance both the CAS and HT roles. In some cases only the CAS role is load balanced. The exact load balancing requirements depend on the number of servers in use and how / where the roles are deployed.

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23rd February 2013

in Microsoft Exchange

Exchange 2013 – Microsoft finally have an email solution designed for high availability and load balancing

Posted by Malcolm Turnbull 23rd February in Microsoft Exchange

OK, So maybe my blog title is a little harsh. The Microsoft Exchange products have been pretty scaleable since Exchange 2007. Exchange 2010 had some vast improvements and you could tell that the Microsoft engineers had put a lot of effort into trying to ease the painful mess that was load balancing an Exchange 2007 cluster. They even started recommending hardware load balancers and certifying vendors for Exchange 2010 compatibility. But with Exchange 2013 they appear to have started from scratch and written it properly! They actually sat down and said "What do we need to have a scaleable Exchange email cluster?". Funnily enough they came up with the same answer that Loadbalancer.org has been banging on about for last 10 years. In order to have a scaleable cluster, each node in the cluster must be able to handle any user session at any time; i.e. no messing around with persistence, sticky plasters, and hack jobs. Well done Microsoft! But please can you put the same infrastructure architects on your LYNC team? Seriously, who puts 3 DMZs in an enterprise product? I had to put Rob (who made sure Loadbalancer.org gained Microsoft Lync certification) on suicide watch ... comic-sketch_3 "Our DMZ is so secure we cant even get into it!"

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28th August 2012

in HAProxy

Load Balancing Exchange 2010 CAS Array with HAProxy (Quick Guide)

Posted by Aaron West 28th August in HAProxy

This Blog is for anyone wanting to load balance the Exchange 2010 CAS role using only open source software. In my example I will be starting with a simple Debian net-install and building the HAProxy package from source because I wanted the latest feature set available. I would definitely recommend using a recent 1.5-dev build if following this guide or parts of the HAProxy configuration may be incompatible.

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