IBM 71413SU Technical Reference - Page 35

hot-swapped by the IT administrator. In general, failed fans should be replaced within 48 hours following failure. The two Gigabit Ethernet ports can be configured as a team to form a redundant pair. The memory subsystem has a number of redundancy features, including memory mirroring and Memory ProteXion, as described in "System memory" on page 21. Support is available for RAID disk arrays, both with the onboard LSI 1078 for RAID-0 and RAID-1. The optional ServeRAID-MR10k provides additional RAID features and a 256 MB battery-backed cache. Thex3850 M2 and x3950 M2 have four internal, hot-swap disk drive bays. The two, standard 1440 W hot-swap power supplies are redundant in all configurations at 220 V. Note that at 110 V, the second power supply is not redundant. The layout of the x3850 M2 and x3950 M2, showing the location of the memory cards, power supplies, and fans, is displayed in Figure 16. Six hot-swap fans (one in each pair is redundant) Two hot-swap redundant power supplies (one below the other) Memory redundancy features: memory mirroring, Memory ProteXion, and ChipKill Figure 16 Redundancy features of the x3850 M2 and x3950 M2 Light path diagnostics To limit the customer's need to slide the server out of the rack to diagnose problems, a light path diagnostics panel is located at the front of the x3850 M2 and x3950 M2. This panel slides out from the front of the server so the customer can view all light path diagnostics-monitored server subsystems. In the event that maintenance is required, the customer can slide the server out of the rack and, using the LEDs, find the failed or failing component. Light path diagnostics can monitor and report on the health of microprocessors, main memory, hard disk drives, PCI adapters, fans, power supplies, VRMs, and the internal system temperature. Figure 17 on page 36 shows the light path diagnostic panel. IBM System x3950 M2 and x3850 M2 Technical Introduction 35