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The good news is, Exchange Server 2007 has plenty of new features to aid your high-availability efforts For the rest of this chapter, we will look at high-availability features in Exchange Server 2007, how they work, and how to set these up
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Out of all the server roles in Exchange, the Mailbox server role is perhaps the one that needs the most high availability love and care Mailbox servers host mailboxes, and they provide access to MAPI clients such as Microsoft Office Outlook An outage of a Mailbox server most immediately and most severely impacts all Exchange users, regardless of the client used Outlook clients using MAPI or Outlook Anywhere, or those using IMAP, POP, Outlook Web Access (OWA), or Exchange ActiveSync (EAS) are equally impacted by it Previous versions of Exchange have relied on server clusters and Microsoft Cluster Service (MSCS) MSCS traces its roots back to Windows NT 40 and Wolfpack, the first version of MSCS, released as a part of Windows NT 40 Service Pack 3 (As some of the examples and screenshots in this chapter will reveal, that codename and the metaphor are used through the rest of this chapter that of individual cluster nodes as wolves, and together the cluster nodes as a pack of wolves, or a wolfpack ) With each version of Windows and Exchange since then (Windows 2000 + Exchange 2000, and Windows Server 2003 + Exchange Server 2003), Exchange clusters have grown increasingly sophisticated in ease of deployment, stability, scalability, and ease of management From the two-node model of the original Wolfpack release, MSCS clusters can now scale up to as many as eight nodes in Windows Server 2003, and as many as 16 nodes in Windows Server 2008 However, the underlying shared nothing model hasn t changed much, nor has the reliance on a bunch of shared disk volumes used to maintain the cluster quorum data and Exchange s Information Store Needless to say, the shared storage has been the proverbial Achilles heel for Exchange clusters utilizing MSCS (in addition to the network used for public communication, the outage of which can result in cluster failure)
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NOTE Windows Server 2003 allows the use of Majority Node Set (MNS) quorum, thus freeing
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MSCS clusters from the conundrum of a single copy of the quorum residing on a shared volume A post-SP1 hotfix (KB 921181) adds support for a File Share Witness to MNS quorum Windows Server 2003 SP2 includes this hotfix
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Many third parties have stepped in to provide an interesting framework of solutions, including replication of shared storage or data, the ability to use geographically dispersed clusters (or geo-clusters), and replacements for MSCS altogether Needless to say, each layer added on top of Exchange or MSCS is another layer of complexity in deployment, operations, and support Exchange administrators and messaging architects have long demanded a better clustering and high-availability model one that doesn t require specially tested and cluster-certified hardware, that doesn t suffer from the single point of failure inherent in shared storage and a single copy of the Information Store, and one that is simple to set up and operate
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19:
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H i g h Av a i l a b i l i t y
How MSCS Clusters Work
The simplest of MSCS clusters can be implemented using two servers running the Enterprise edition of the Windows Server operating system and shared storage The shared storage can be an external parallel SCSI box, shared by the two nodes, or more expensive storage area networks (SAN) or network attached storage (NAS) (As mentioned later in this chapter, Windows Server 2008 failover clusters do not support parallel SCSI) No matter what storage you use, it should appear as a local volume to the cluster SANs typically use Fiber Channel transport Storage adapters known as Fiber Channel Host Bus Adapters (HBAs) are installed in the servers, which can talk to SAN storage directly or through a Fiber Channel switch NAS uses plain-vanilla network interfaces (the familiar Ethernet variety found in most servers) and proprietary protocols Software utilities and drivers are installed on the servers to make the NAS disk volumes appear as locally attached volumes In recent years, a new protocol called iSCSI has become increasingly popular Other components of a cluster include: Network interfaces, networks, and IP addresses Each server participating in a cluster is known as a cluster node Each node has two network interfaces (NICs) One NIC is connected to the public network, to allow client computers and other servers to connect to the cluster The second NIC is connected to a private network on a different IP subnet, for internal cluster communication This communication consists of small User Datagram Protocol packets, called heartbeats, allowing each cluster node to communicate its state Another IP address from the public network is assigned to the cluster itself, allowing management applications to connect to it and manage it
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