IBM System x3950 M2 and x3850 M2 Technical Introduction
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.
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.
Memory redund-
ancy features:
memory mirroring,
Memory ProteXion,
and ChipKill
Six hot-swap fans
(one in each pair is
redundant)
Two hot-swap redundant
power supplies (one
below the other)
