Exchange Server 2007 and Your Hardware
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Memory Exchange Server 2007 has been tested and developed for maximum memory configurations of 32 gigabytes (GB) for Mailbox servers and 8 GB for all other server roles. The minimum random access memory (RAM) allowed is 1 GB, with 2 GB of RAM as the recommended minimum. In most cases, you'll want to have at least twice the recommended minimum amount of memory. The primary reason for this is performance. Most of the single-server Exchange installations I run use 4 GB of RAM as a starting point, even in small installations. In multiple Exchange Server installations, the Mailbox server should have at least 2 GB RAM plus 10 (megabytes) MB RAM per mailbox. For all Exchange Server configurations, the paging file should be at least equal to the amount of RAM in the server plus 10 MB.
CPU 64-bit versions run on the X64 family of processors from AMD and Intel, including AMD64 and Intel Extended Memory 64 Technology (Intel EM64T). Exchange Server 2007 provides solid benchmark performance with Intel Xeon 3.66 GHz, AMD Opteron 2.6 GHz, and AMD Athlon 2.6 GHz. Any of these CPUs provide good starting points for the average Exchange Server system. You can achieve significant performance improvements with a high level of processor cache. Look closely at the L1, L2, and L3 cache options available-a higher cache can yield much better performance overall.
The primary advantages of 64-bit processors over 32-bit processors have to do with memory limitations and data access. Because 64-bit processors can exceed the 4 GB memory limit of 32-bit processors, they can store greater amounts of data in main memory, providing direct access to and faster processing of data. In addition, 64-bit processors can process data and execute instruction sets that are twice as large as 32-bit processors. Accessing 64 bits of data (versus 32 bits) offers a significant advantage when processing complex calculations that require a high level of precision.
Exchange 2007需要大内存和性能要求很高的CPU，微软建议2G的内存，但是那只是推荐，就和WS03推荐512M内存，实际上都会是推荐的2倍大小，也就是说EXCHANGE 2007最小需要4G的内存。另外一个方面，微软最佳的做法是，10M per Mailbox
10M per Mailbox 指的什么呢？每个用户10M的额外内存，那就意味着我100个用户，就需要额外的1G内存，那么实际Exchange 2007要求5G的内存，这就是推荐配置。
之前我听WEBCAST是5M，这下就翻了2倍。
CPU，很好，X64上了，话说之前有位哥们成功从WINDOWS X86升级到X64，牛啊。那么，EXCHANGE 2007生产环境下为什么只能安装在X64架构上呢？
原因很简单，如果用32bit，那么只能支持最大4G内存，显然是不够的。再加上EXCHANGE数据库的读写，网络信息传入传出，需要高性能的CPU，那么64BIT就大显身手了。哈哈
聊到这，睡会。 本文出自 “www.exlab.cn” 博客，谢绝转载！ 本文出自 51CTO.COM技术博客 |
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