29-07-2006, 21:14
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מנהל פורום מערכות הפעלה - הרובע המייקרוסופטי.
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חבר מתאריך: 07.10.04
הודעות: 13,777
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נשמע מוזר... (התשובה, לא השאלה)
ציטוט:
2: You Must Be 64 to Enter
In the past, Microsoft has specified a particular processor architecture (e.g., Pentium III) as the baseline for a given product. However, in late 2005, the company made a somewhat different announcement—that Exchange 2007 will run only on 64-bit CPUs from Intel and AMD. (Note that Exchange 2007 doesn't and probably won't run on Intel's Itanium architecture.) The beta builds of Exchange 2007 are available in both 32- and 64-bit versions, but the shipping version will be available only for 64-bit hardware. Therefore, if you're buying servers now, you should ensure that they support either Intel Extended Memory 64 Technology (EM64T) or AMD Opteron architectures—no Celerons, please.
To run Exchange 2007, you'll need the 64-bit version of Windows Server 2003 and the appropriate 64-bit–compatible drivers and versions of certain applications you run on your Exchange server. In particular, any application that requires a kernel-mode driver (e.g., replication software, some types of SAN software) will need 64-bit versions. Some vendors do a better job than others of supporting new OS or CPU versions, and a slow vendor might slow your ability to deploy Exchange 2007, so it's wise to begin planning for this transition now.
Fortunately, the odds are good that if you purchased your current server hardware within the last 12 to 18 months, it already supports one of these architectures,although you probably don't have as much RAM in these servers as they support. Exchange 2007 running on the 64-bit version of Windows 2003 can use several gigabytes of RAM for caching (compared with an upper limit of about 900MB for Exchange 2003 running on 32-bit Windows 2003), and this extra RAM makes a huge performance difference. One key Exchange 2007 goal was to enable the use of large mailboxes while reducing the total I/O required for those mailboxes; adding RAM achieves that goal. Fortunately, it's much less expensive to add RAM than to buy more disks, which is what you'd have to do to get similar scalability on Exchange 2003. Unfortunately, you'll have to do a swing upgrade to get Exchange 2007 onto your 64-bit hardware; there's no way to do an in-place upgrade of Exchange 2003 on 32-bit Windows to Exchange 2007 on 64-bit Windows. You can find more information about upgrading using the swing method in the Microsoft article "How to upgrade to Exchange Server 2003 by using the swing upgrade method" (http://support.microsoft.com/?kbid=821896).
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ציטוט:
Q. Why did Microsoft make the decision to offer Exchange 2007 as a 64-bit application?
A.
Exchange has been operating within the same 32-bit architecture for the past 10 years, since Exchange 4.0. The messaging environment has evolved over time into a mission-critical application for most businesses today, and demands placed on messaging systems will continue to grow. We witness this growth through the increase of e-mail traffic and larger attachments that now require larger mailboxes to store these messages. Users are also accessing their e-mail in more ways, such as with mobile devices, through Web browsers using Outlook Web Access, and other applications, including Microsoft Office Communicator, MSN desktop search, and Microsoft Customer Relationship Management (CRM) applications. Trends indicate that demands on messaging systems will continue to grow and 64-bit servers provide the system architecture to meet these demands while reducing costs within organizations through server and disk storage consolidations. With a larger addressable space, the Exchange servers can utilize more memory thereby reducing the required input/output per user (IOPS), enabling the use of larger disks as well as low cost storage such as SATA2 drives. Testing at Microsoft has shown an IOPS decrease of approximately 70% with Exchange Server 2007 on 64-bit hardware. Our beta customers have been able to directly translate this into an increased utilization of current drives in their storage area networks (SAN) as well as new direct attached storage (DAS) topologies, thus significantly reducing their storage costs, which make up roughly 80 percent of hardware capital costs today.
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