Dell PowerEdge M1000e Technical Manual

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Dell PowerEdge M1000e Technical Manual Manual pdf 18 page image

DellPowerEdge M1000e Technical Guide 174.9 Fans`Figure 10. Rear View Showing FansThe PowerEdge M1000e chassis comes standard with 9 hot-swappable, redundant fan modules thatare distributed evenly across the enclosure. The speed of each fan is individually managed by theCMC. Together, these design innovations can provide:• Significant power savings as compared to older servers• Less airflow required as compared to the same number of similarly configured 1U servers• A similar acoustic profile as compared to previous serversFans are N+1 redundant, meaning that any single fan can fail without impacting system uptime orreliability. In the event of a fan failure, system behavior is dependent on the resultant temperaturesof the system, as monitored by the Server Module iDRAC and I/O Modules. The CMC continues tointerpret the airflow needs of each server and I/O module to control the fan speeds appropriately.The system will not ramp the fans to full speed in the event of a fan failure unless deemed necessaryby on‐board monitoring. Failure of more than one fan will not automatically result in shutting downof blade servers. This is because the blade servers have their own self-protection mechanisms toprevent them from running too hot. The result of a failure of multiple fans would depend on theconfiguration, ambient temperature, and workload being run. For example, the processors within ablade are automatically throttled back by that server if they reach a thermal threshold and then shutdown if a critical over-temperature threshold is met.