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An ASM interconnect network can have up to 24 RS-485 connections, depending
on the configuration. The connections can include Remote Supervisor Adapter
II-EXAs, Remote Supervisor Adapter IIs, Remote Supervisor Adapters, ASM
processors, ASM PCI adapters, and ISMPs. Use the following information to
determine the number of servers and connections that you can have on your ASM
interconnect network:
v Each Remote Supervisor Adapter II-EXA, Remote Supervisor Adapter II, Remote
Supervisor Adapter, ASM processor, ASM PCI adapter, and ISMP in a server that
is connected to the network uses one connection. For example, if a server that is
connected to the network has a Remote Supervisor Adapter and an integrated
ASM processor, the server uses two connections on the network.
v The network must include at least one server with a Remote Supervisor II-EXA,
Remote Supervisor Adapter II, or Remote Supervisor Adapter (either installed as
an option or preinstalled in the server).
v On an ASM interconnect network, one ASM processor or one ASM PCI adapter
can communicate with 11 RS-485 connections. These connections must be to
ASM processors, ASM PCI adapters, Remote Supervisor Adapters, Remote
Supervisor Adapter II-EXAs, or Remote Supervisor Adapter IIs. The ASM
processor and ASM PCI adapter cannot communicate with ISMPs.
v If your existing ASM interconnect network has 12 RS-485 connections that
include only ASM processors, ASM PCI adapters, and at least one Remote
Supervisor Adapter or Remote Supervisor Adapter II, you can also add up to 12
ISMP-based servers to this same network. The Remote Supervisor Adapter on
this network will communicate with all 23 RS-485 connections; however, an ASM
processor or ASM PCI adapter on this network will communicate with only the 11
non-ISMP RS-485 connections. The ASM processor and ASM PCI adapter will
not recognize the ISMPs, but the ISMPs can reside on the same ASM
interconnect network.
v Make sure that the ASM interconnect network is set up as a bus, not as a ring.
You must connect the servers to the ASM interconnect network in a series, with
terminated beginning and end points. Be sure to use the RS-485 terminator
plugs. For more information, see "Using the RS-485 terminator plugs on
interconnected servers."
v Make sure that the total combined length of all Ethernet cables connecting the
servers in the ASM interconnect network does not exceed 91 m (300 ft).
Using the RS-485 terminator plugs on interconnected servers: The Remote
Supervisor Adapter II-EXA comes with two RS-485 terminator plugs. To ensure
successful RS-485 communication on your ASM interconnect network, you must
install the terminator plugs in the open connectors at each end of the RS-485 bus.
The illustrations in "ASM interconnect network configuration examples" on page 42
can help you determine where to put the RS-485 terminator plugs on your ASM
interconnect network.
Forwarding alerts: Remote Supervisor Adapters, ASM PCI adapters, ASM
processors, and ISMPs that are connected to an ASM interconnect network share
resources and system-management information. This section provides information
about how alerts are forwarded in the ASM interconnect network.
During normal operation, each Remote Supervisor Adapter, ASM processor, ASM
PCI adapter, and ISMP on the ASM interconnect network communicates with the
other processors and adapters on the network. Processors or adapters that have a
modem or Ethernet connection notify the other processors and adapters that these
communications resources are available for use by other servers on the ASM
interconnect network. These resources are then used as ASM interconnect network
41
Chapter 2. Configuration
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