IBM 867413x - Eserver xSeries 330 8674, Hardware Maintenance Manual

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If ASM processor 1 generates the alert and sends it to ASM processor 2 to send,
and the dial-out on ASM processor 2 fails, the alert is not forwarded to ASM
processor 3. This might happen if the modem is connected to ASM processor 2
but the modem cannot obtain a dial tone.
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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.
Cabling for the ASM interconnect network
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 ASM Interconnect module needed
xSeries 220 yes
Netfinity 5000 yes
Netfinity 5500 yes
Netfinity 5500-M10 yes
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Hardware Maintenance Manual: xSeries 330 Type 8674, IntelliStation R Pro Type 6851, and Network Equipment Building
System Type 8674