Sizing Guide Exchange Server 2003 - Fujitsu

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White Paper Sizing Guide Exchange Server 2003 Version: 4.2, July 2006 What’s new in Exchange Server 2003 Microsoft Exchange Server‟s ten year history goes back to 1996. The first version of Exchange was version number 4.0 because it replaced the predecessor product, MS Mail 3.2. However, Exchange has as regards architecture nothing in common with MS Mail, except that both applications are basically used to exchange e-mails. Today, ten years after the market launch, Exchange bears the product name Exchange Server 2003 and the internal version number 6.5. After three years Exchange Server 2003 is the successor to Exchange 2000 Server. Based on the product name and the period of time that lies between the two product versions, it could be assumed that Exchange Server 2003 has revolutionary changes to offer, but as can be seen from the internal version code, it is a socalled point release. In comparison with the changes between Exchange 5.5 and Exchange 2000 Server, the changes are less revolutionary and more of an evolutionary nature. Compared with its predecessor version Exchange 5.5, Exchange 2000 Server involved a completely new concept for database organization and user data administration, which had consequences up to and including the domain structure of the Windows network so that migration from Exchange 5.5 to Exchange 2000 Server was necessary. The consequence is that many Exchange users have shied away from these migration costs and are migrating directly from Exchange 5.5 to Exchange Server 2003. On the other hand, the migration from Exchange 2000 Server to Exchange Server 2003 is proving to be considerably less problematic and is the equivalent of a simple update. Nevertheless, the new functions in Exchange Server 2003 as opposed to Exchange 2000 Server are not to be despised. And also with the Service Pack 1 (SP1) and Service Pack 2 (SP2) for Exchange Server 2003 not only are problems fixed, they offer a lot of new and improved features, like mobile e-mail access with direct push technology and improved SPAM filtering methods with »Intelligent Message Filter« (IMF). The white paper entitled What's new in Exchange Server 2003 [L7] from Microsoft describes on more than 200 pages the new features of Exchange Server 2003, including SP2. The bulk of the new functions refer to security, manageability, mobility and client-side extensions, as provided by the new standard client for Exchange - Outlook 2003 and the revised OWA (Outlook Web Access). In the following we intend to concentrate on a number of outstanding innovations that have an impact on the hardware basis of an Exchange server. Shorter backup and restore times The Volume Shadow Copy Service (referred to in short as VSS) is in fact a new function of Windows Server 2003 and enables the creation of snapshot backups. Exchange Server 2003 is compatible with this new VSS function. Thus making it possible to take backups of the Exchange databases in a very short time and at the same time drastically reduce backup and restore times, which turn out to be the limiting factor in large Exchange servers. In the following chapters Consolidation and Backup this functionality is addressed in more detail. Exchange Server 2003 offers for the first time a simple method of restoring individual mailboxes. To this end, there is a separate Recovery Storage Group, which permits the restore of individual mailboxes or individual databases during operation. Extended clustering In contrast to Exchange 2000 Server, which supported a cluster with two nodes on the basis of Windows 2000 Advanced Server and four nodes under Windows 2000 DataCenter Server, Exchange Server 2003 permits a cluster with up to eight nodes to already be implemented on Windows Server 2003 Enterprise Edition. Exchange 4.0 v 4.0 Apr. 1996 Exchange 5.0 v 5.0 Mar. 1997 Exchange 5.5 v 5.5 Nov. 1997 Exchange 2000 v 6.0 Oct. 2000 Exchange 2003 v 6.5 Oct. 2003 Exchange 2003 SP1 v 6.5 May 2004 Exchange 2003 SP2 v 6.5 Oct. 2005 Number of cluster nodes Exchange 2000 Enterprise Server Exchange 2003 Enterprise Edition Windows 2000 Server - - Advanced Server 2 2 DataCenter Server 4 4 Windows 2003 Standard Edition - - Enterprise Edition - 8 Datacenter Edition - 8 © Fujitsu Technology Solutions, 2009 Page 4 (69)
White Paper Sizing Guide Exchange Server 2003 Version: 4.2, July 2006 Reduced network load With the new functionality of client-side caching, the current Outlook 2003 version of the standard Exchange client makes an important contribution toward reducing network load. Particularly with clients connected through a low-capacity WAN, this greatly relieves the load on the network and also on the server. Whereas all previous Outlook versions submitted a request to the Exchange server for every object, the Exchange server is now only bothered in this way for first access. Afterwards data compression is used for communication between Outlook 2003 and Exchange Server 2003. Communication of the Exchange servers with each other has also been optimized. For example, for the replication of public folders a least-cost calculation is now always taken as a basis, and the accesses of Exchange Server 2003 to the Active Directory are reduced through better caching algorithms by up to 60%. It should be noted that many of the new functions of Exchange Server 2003 are only available if Exchange Server 2003 is used in conjunction with Windows Server 2003 and Outlook 2003. For more details see the white paper entitled What's new in Exchange Server 2003 [L7]. Preview of Exchange 2007 After looking back on the history of Exchange Server 2003, we would now also like to briefly look to the future of Exchange Server. The next version of Exchange will be called »Exchange Server 2007« and, as the name already suggests, will appear in 2007. The outstanding performance-relevant change will be the changeover from the 32-bit to the 64-bit version. Exchange Server 2003 is a 32-bit application and runs solely on the 32-bit version of Windows. Since Exchange Server 2003 does not actively use PAE, Exchange is limited to an address space of 3 GB. A configuration of an Exchange Server with more than 4 GB of main memory does not entail a gain in performance. On the other hand, Exchange »lives« from the cache for the database (see chapter Main memory). This limitation will be overcome with Exchange Server 2007. Exchange Server 2007 will only be available as a 64-bit version for x64 architectures (Intel CPUs with EMT64 and AMD Opteron); a version for the IA64 architecture (Itanium) is not planned. As the table opposite illustrates, the usage of the physical memory is considerably improved with 64 bit. With sufficient memory, Exchange Server 2007 will benefit particularly from a larger database cache. This reduces the number of disk accesses and thus the requirements made of the disk subsystem, which in today‟s Physical memory Exchange address space Windows Server 2003 R2 Standard Edition 4 GB 3 GB Windows Server 2003 R2 Enterprise Edition 64 GB 3 GB Windows Server 2003 R2 Datacenter Edition 128 GB 3 GB Windows Server 2003 R2 x64 Standard Edition 32 GB 8 TB Windows Server 2003 R2 x64 Enterprise Edition 1 TB 8 TB Windows Server 2003 R2 x64 Datacenter Edition 1 TB 8 TB Exchange configurations frequently determines the performance of the entire system. As a result, it is possible with Exchange Server 2007 to either organize the disk subsystem with an unchanged number of users in a more cost-effective way or manage a larger number of users. In addition, Exchange Server 2007 entails a number of new or extended functionalities, the listing of which would go beyond the scope of this paper. More details about Exchange Server 2007 can be found on the Microsoft web page http://www.microsoft.com/exchange/preview/default.mspx. At the same time with Exchange Server 2007, a revised version of Outlook will also appear on the client side. The web page http://www.microsoft.com/office/preview/programs/outlook/overview.mspx gives an overview of Microsoft Office Outlook 2007. © Fujitsu Technology Solutions, 2009 Page 5 (69)
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