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Availability Planning for Mailbox Servers
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ChapTEr 11
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The fundamental change is where the data redundancy is handled. administrators are used to raID, which has been used for a long time. The additional activities that have to be performed within Exchange to provide redundancy are new. Without additional integration, many monitoring systems will not be able to effectively understand this new redundancy model. Confusion regarding how to handle failures increases the likelihood that an administrator may not identify the problem or respond quickly enough to the failure. During the design process the risk of the operational excellence and the time it takes to reseed are important factors to consider in determining whether JBOD is a viable solution for you.
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Availability Planning for Client Access Servers
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Unlike the Mailbox server role and to some extent the Transport server roles, the Client Access Server role does not have any inherent high-availability functionality built in. That does not mean that it was designed without high availability in mind it just requires other modalities to provide high availability. A separate product or feature is required to provide this functionality. The following sections cover choosing and configuring the best solution depending on deployment requirements.
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Client access Load Balancing and Failover Solutions
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To provide Client Access high availability requires multiple Client Access servers to be deployed in the same Active Directory site. As mentioned, there is no integrated mechanism to provide load balancing and failover capabilities if a host becomes unavailable or overloaded. However, a variety of products are available that fill this need. Because the Client Access servers provide so many services with a number of different connections types from OWA to MAPI to Web Services three types of Client Access server traffic actually need to be load balanced:
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Traffic from internal networks Traffic from external (Internet) networks Traffic from other Client Access Servers (proxy)
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Some Exchange communications are stateful, meaning the application requires that the communication context be maintained with the same host until the session is completed. This is common in conversations that we have daily. If a co-worker asks what the deadline is for your project and then you walk into another co-worker s office and say Wednesday, she will likely have no idea that you were answering John s question. This is similar to how
500 ChapTEr 11 Designing High Availability
a stateful program works: It expects to continue communication with the same context until the conversation is completed. Other protocols are stateless, such as HTTP, where state information is lost between client requests. In the case of multiple, load-balanced hosts, affinity is a mechanism to direct subsequent calls to the host that answered the initial request. It is important to understand the different types of affinity and how they are used. The Client Access server uses a number of protocols that will need to be load balanced, including HTTP and RPC. Remember some Client Access server protocols require affinity and some do not.
EXISTING COOKIES
Existing cookie affinity uses cookie information transmitted during typical client/server sessions. This type of affinity is only useful for protocols using HTTP and thus not an option for any RPC communication. OWA using forms-based authentication is an example of an application that does use existing or application cookies.
LOaD BaLaNCEr COOKIES
Using load balancer cookies is similar to using existing cookies except that the load balancer creates the cookie and does not rely on any existing cookies. As with existing cookies, this is only usable with HTTP. Additionally, the client must support the addition of the load balancer generated cookie. Exchange ActiveSync, Outlook Anywhere, and some Exchange Web Services do not support this capability. However, Outlook Web App, Exchange Control Panel, and Remote Windows PowerShell are good candidates for this type of affinity.
SOUrCE Ip
Source IP is perhaps the most common and widely supported type of affinity. With Source IP affinity, the load balancer records a client s IP address and the initial destination host. All subsequent traffic from that source IP will continue to go to the same destination host for a period of time. However, source IP load balancing has two main drawbacks. First, affinity breaks when clients change their IP addresses. If you have an environment where this happens frequently, such as mobile clients roaming between wireless networks, this will cause issues. Users may experience symptoms such as having to re-authenticate. Second, if you have an environment where many clients share the same source IP, such as when a device performing Network Address Translation (NAT) is used, the load will not be evenly distributed because all clients behind the NAT will be routed to the same destination IP address.
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