IBM 8687 Installation Guide - Page 116
Rack installation
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Relative Performance (%) 400 - File/Print Serving Environment 300 - 200 100 - 100 118 116 114 400 300 200 100 - Database/Application Environment 280 230 175 100 1 2 3 4 Number of Processors 1 2 3 4 Number of Processors Figure 3-12 Effect of adding processors under file/print and application environments SMP will not provide a linear improvement in processing power as additional processors are added. You might achieve a 70-90% performance increase from the second processor, but each additional processor after the second will provide a diminishing return on investment as other system bottlenecks come into play. For more information regarding multiprocessor systems and performance tuning xSeries servers, refer to the redbook Tuning IBM ^ xSeries Servers for Performance, SG24-5287. For performances results of four-way and eight-way x440s running SAP and TPC-C benchmarks, see: http://www.pc.ibm.com/ww/eserver/xseries/benchmarks/series.html 3.7 Rack installation The x440 is 4U in height and is intended for use as a rack-drawer server. Due to power distribution considerations, it is recommended that no more than eight 4U x440 chassis be installed in a single 42U rack, leaving 10U available for RXE-100 Remote I/O enclosures, disk or tape storage, or other devices. The x440 is 27.5" deep, and is designed to be installed in a 19-inch rack cabinet designed for 28" deep devices, such as the NetBAY42 ER, NetBAY42 SR, or NetBAY25 SR. Although the x440 system is rack optimized, it may be converted into a tower by installing it in a NetBAY11 SR Standard Rack Cabinet. The NetBAY11 rack supports shipment of fully configured xSeries 440 and other rack-optimized xSeries servers. Installation considerations include the following: The system is not designed to run vertically, and therefore must always be run in a horizontal position. 102 IBM ^ xSeries 440 Planning and Installation Guide