Bull Novascale Blade BL465, Инструкция по установке и эксплуатации, Страница: 113 / 128

Chapter 6. Accessing the IMM
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Chapter 6. Accessing the IMM
Unlike a baseboard management controller, the IMM does not require IPMI device drivers
or USB daemons for in-band IMM communication. Instead, a LAN over USB interface
enables in-band communications to the IMM; the IMM hardware on the system board
presents an internal Ethernet interface from the IMM to the operating system. LAN over USB
is also called the USB in-band interface in the IMM Web interface.
In a BL465 complex, each IMM is shown as a LAN over USB device in the operating
system. For each blade server in the BL465 complex to be a unique and known IP address,
both blade servers have different default IP addresses. The default IP address for the
primary blade server is 169.254.95.118, and the Keyboard Controller Style (KCS)
address is 0x6CA8.
For packets to be routed correctly from the host to the IMMs, each of the LAN over USB
interfaces must appear on a separate subnet to the host. The IMM implements a DHCP
server that services only the LAN over USB interface. It assigns the subnet mask on the LAN
over USB interfaces for the host to 255.255.255.0.
The following table shows the IP addresses for each of the modules in a BL465.
Blade
server
Logical
node
ID
IMM IP address Host address Host subnet
Host subnet
mask
Keyboard
Controller
Style
(KCS)
address
Primary
0
169.265.95.118 169.254.95.120 169.254.95.0/24 255.255.255.0 0x8CA6
Secondary
1
169.265.96.118 169.254.96.120 169.254.96.0/24 255.255.255.0 0x8CA8
Table 6-1. LAN over USB addresses
LAN over USB devices are not aware of LAN over USB devices in other partitions.
Therefore, if you configure the two blade servers as two independent partitions in a BL465,
each blade server is considered to the primary blade server of the hardware partition that
contains that blade server. The logical ID of the primary in each partition is 0 and the
default IP address of each primary blade server is 169.254.95.118.
6.1 Potential conflicts with the LAN over USB interface
In some situations, the IMM LAN over USB interface can conflict with certain network
configurations, applications, or both. For example, Open MPI attempts to use all of the
available network interfaces on a server. Open MPI detects the IMM LAN over USB
interface and attempts to use it to communicate with other systems in a clustered
environment. The LAN over USB interface is an internal interface, so this interface does not
work for external communications with other systems in the cluster.