Cabling For The Asm Interconnect Network - IBM IntelliStation R Pro Hardware Maintenance Manual

Cabling for the ASM interconnect network

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Hardware Maintenance Manual: xSeries 330 Type 8674 and IntelliStation R Pro Type 6851
processor 3. This might happen if the modem is connected to ASM processor 2
but the modem cannot obtain a dial tone.
• If ASM processor 1 generates an alert and if within a 45 second window prior to
the ASM processor 1 generating the alert the modem is unplugged from ASM
processor 2, ASM processor 1 forwards the alert to ASM processor 2 (since ASM
processor 1 "thinks" ASM processor 2 has an available modem). When ASM
processor 2 receives the forwarded alert it determines that a modem is attached
and forwards the alert to ASM processor 3. Therefore, depending upon the time
frame within which a resource (modem) fails the alert might be forwarded
multiple times until an interconnect device can send the alert.
During normal operation, each Remote Supervisor Adapter, ASM processor, or ASM
PCI adapter 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
resources, enabling Remote Supervisor Adapters, ASM processors, or ASM PCI
adapters on the ASM interconnect network to send alerts using a modem or the
network, even if they do not have a modem or network connection physically
attached.
When alerts are generated, they are forwarded to the Remote Supervisor Adapter,
ASM processor, or ASM PCI adapter on the ASM interconnect network that has the
communication resources to forward the alert. If no system on the ASM interconnect
network meets the requirements, the alert is set for transmission if the connection type
is configured or becomes available later.
If multiple modems or multiple network connections exist in the ASM interconnect
network, you cannot specify which system will receive an alert or which will use its
modem or network connection to forward the alert. If an alert is forwarded to another
Remote Supervisor Adapter, ASM processor, or ASM PCI adapter that is unable to
deliver the alert (for example, the modem it is configured to use has failed or the
network cannot resolve the destination IP address), the processor or adapter attempts
to forward the alert to another system on the ASM interconnect network that has the
communication resources to forward the alert.
Use this procedure to cable for the ASM interconnect network. Depending upon the
servers you have, you might need additional ASM Interconnect modules or CAT 5 or
CAT 3 Ethernet cables. This table lists some of the IBM Netfinity and IBM xSeries
products and indicates if they have an integrated RS-485 ASM interconnect
connection, or if you need to use an ASM Interconnect module to set up the ASM
interconnect network.
Table 11. ASM interconnect network server list.
Server Name
xSeries 220
Netfinity 5000
Netfinity 5500
Netfinity 5500-M10
Netfinity 5500-M20
Netfinity 5600 or xSeries 240
ASM Interconnect module needed
yes
yes
yes
yes
yes
yes