058 we then analyzed a subset of the servers by

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Unformatted text preview: of the servers by application type. 0.5 GB 1.0 GB 1.5 GB 2.0 GB 2.5 GB 3.0 GB Average Memory Consumed by Quartile Figure 2. Excluding the top quartile, analysis showed that for 75 percent of production servers, maximum memory consumption averaged about 1 GB. 3.5 GB In several common categories, a significant proportion of servers used less than 1 GB memory. These included: • Nearly 50 percent of file servers • Nearly 50 percent of Web servers • More than 50 percent of backup servers • About 30 percent of e-mail servers • Nearly 25 percent of database servers 6 Memory Sizing for Server Virtualization Target Platform White Paper Table 1. Typical Memory Options for Dual-Socket Servers We assumed that we would use Quad-Core Intel® Xeon® processor- Dual In-line Memory Modules (DIMMs): based servers as our target virtualization host platforms. Previous Available Sizes 512 MB 1 GB 2 GB 4 GB Intel IT and industry testing had shown that these dual-socket Price per GB ~$300 ~$250 ~$275 ~$1000 8 4 GB 8 GB 16 GB 32 GB 12 6 GB 12 GB 24 GB 48 GB 16 8 GB 16 GB 32 GB 64 GB quad-core servers, with a total of eight cores, deliver good performance with low TCO. Potential Memory Configurations We assessed memory configuration options for our target virtualization servers, as shown in Table 1. The most common dual- DIMM Slots: Note: Prices shown are accurate as of April 2007. socket servers have eight DIMM slots, though some have 12 or 16 slots. At the time we conducted our analysis, four sizes of memory module were widely available for these slots: 512 MB, 1 GB, 2 GB, and 4 GB. The cost per GB was similar for the 512 MB, 1 GB, and 2 GB modules. However, for the 4 GB modules, the cost per GB was several times higher. We determined that 2 GB DIMMs represented the best trade-off of power, cost, and capacity. Using 2 GB DIMMs, we could configure servers with 16 GB, 24 GB, or 32 GB of memory depending on the number of slots, with relatively low power consumption and at much lower cost than using 4 GB DIMMs. We expect to periodically reassess memory options. Hypervisor...
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