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3.5 PCI Express options
This section describes the PCI Express (PCIe) subsystem and the supported
PCI Express adapters of the x3850 M2 and x3950 M2. The x3850 M2 and
x3950 M2 both have seven half-length full-height PCIe x8 slots, two of which
support the hot removal (hot-swap) of adapters.
The slots are connected to one of two 4-port PCIe x8 controllers as follows:
PCIe controller 1: Slot 1-4
PCIe controller 2: Slot 5-7, onboard SAS LSI1078
The onboard SAS LSI1078 uses a dedicated PCIe port to the second PCIe
controller. The onboard SAS controller and the optional ServeRAID-MR10k are
discussed in 3.3, "Internal drive options and RAID controllers" on page 124.
The Remote Supervisor Adapter II and the new Broadcom NIC interface are
linked to the Intel ICH7 Southbridge, so that it is no longer shared with the
onboard SAS and RAID controller because it is at X3 chipset based systems.
3.5.1 PCI and I/O devices
The following I/O slots/devices are available at Intel ICH7 Southbridge:
RSA II adapter: dedicated PCI 33MHz/32bit slot to RSA II video
Onboard Broadcom NetXtreme II 10/100/1000 NIC 5709C: PCIe x4
connection to the single-chip high performance multi-speed dual port
Ethernet LAN controller
ServeRAID-MR10k: dedicated 128-pin DIMM socket
3.5.2 PCI device scan order
The system scans the slots in the following sequence:
1. Slot internal SAS devices.
2. PCIe slot 1, 2, 3, 4, 5, 6, 7
188
Planning, Installing, and Managing the IBM System x3950 M2
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