Lenovo 8721 Product Manual

Also see for 8721: Quick start instructions

Contents

Fan modulesThe Enterprise Chassis supports up to a total of ten hot-swap fan modules: two 40 mm (1.57 in) fanmodules and eight 80 mm (3.14 in) fan modules.The two 40 mm fan modules distribute airflow to the I/O modules and chassis management modules. Bothof these fan modules ship with the chassis. The 80 mm fan modules distribute airflow to the computenodes through the chassis from front to rear. Each 80 mm fan module actually contains two 80 mm fanmodules, back to back at each end of the module, which are counter-rotating. The following figure showsthe 80 mm fan module.Figure 11. 80 mm fan moduleFour 80 mm fan modules are installed standard in chassis model 8721-A1x and CTO orders. Themaximum number of 80 mm fan modules that can be installed is eight. Ordering information is shown inthe following table. When the modules are ordered as a part number, they are supplied as a pair. Thefeature codes is comprised of one fan.Table 10. Fan module ordering informationDescription Part number Feature codeFlex System Enterprise Chassis 80mm Fan Module 43W9078(2 fan modules)A0UA(1 fan module)The 80 mm fan modules are populated, depending on the nodes installed. To support the baseconfiguration and up to four nodes, chassis model 8721-A1x ships with four 80 mm fan modules and two40 mm fan modules preinstalled. There are two cooling zones for the nodes: a left zone and a right zone.Fan modules must be installed in pairs as shown in the following figure. If there are insufficient fanmodules for the number of nodes installed, the compute nodes might be throttled to balance heatgeneration and cooling capacity.Flex System Enterprise Chassis 19