IBM Eserver xSeries 360 Type 8686, Руководство пользователя

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40
IBM® xSeries 360: User’s Reference
network meets the requirements, the alert is set for transmission if the connection
type is configured or becomes available later.
If multiple modems or 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 a 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.
Alerts are typically sent only once (per connection type), but an alert is forwarded to
another interconnect device if the resources exist on other interconnect devices in the
network. For example, on a three ASM processor network where ASM processor 1
generates a modem alert, but does not have a modem and the other ASM processors
have modems, the following might occur:
If ASM processor 1 generates an alert and the modem is unplugged from ASM
processor 2 45 seconds prior to ASM processor 1 generating the alert, ASM
processor 1 forwards the alert to ASM processor 2, having previously determined that
ASM processor 2 has an available modem. When ASM processor 2 receives the
forwarded alert, it determines that a modem is attached to ASM processor 3, and
forwards the alert. Therefore, depending upon the time frame (45 seconds) within
which a resource (modem) fails, the alert might be forwarded multiple times until an
interconnect device can send the alert.
Cabling for the ASM interconnect network
Depending upon the servers you have, you might need additional ASM Interconnect
modules or Category 5 or Category 3 Ethernet cables. Table 4 on page 41 lists some
IBM Netfinity and IBM xSeries products, and indicates whether you need to use an
ASM Interconnect module to set up the ASM interconnect network.