P5机器上每个系统抽屉有两个集成串口，跟HMC口在一起的那两个是处于激活状态的。如果使用了HMC口，那集成串口是无法使用的。另外P5上的集成串口不能用来实现HACMP的心跳。参考文档如下：
here is the info for the onboard serial ports for some p5 servers.
Integrated I/O ports
Although each system drawer is equipped with two integrated serial port external connectors, only two serial ports are activated in a multi-drawer configuration. Integrated serial ports are activated in the drawer that has the active Service Processor (#7881 or #7997) installed. Integrated serial ports in other system drawers are not functional.
Each system has two HMC ports on each installed Service Processor Card (#7881 or #7997). Only system drawers with Service Processor Cards (#7881 or #7997) have HMC ports.
Integrated serial ports are not supported when the HMC ports are connected to a Hardware Management Console. Either the HMC ports or the integrated serial ports can be used, but not both.
The integrated serial ports are supported only for modem and async terminal connections. Any other applications using serial ports require a separate serial port adapter to be installed in a PCI slot. The integrated serial ports do not support HACMP configurations
options are
(#2943) 8-Port Asynchronous Adapter EIA-232/RS-422, PCI bus
For connection of up to 8 asynchronous EIA-232 or RS-422 devices. All eight ports are software programmable to support either EIA-232E or RS-422A protocols, at up to 230K baud.
Attributes provided: 8 Async ports
Attributes required: One PCI slot
For 9117-570: (#2943)
Minimum required: 0
Maximum allowed: 8 (Initial order maximum: 8)
OS level required: AIX 5.2 or AIX 5.3, or later; Linux - Refer to the following URL for systems and features that operate with Linux:
factsfeatures.html
or
(#5723) 2-Port Asynchronous IEA-232 PCI Adapter
Connection for 2 Asynchronous EIA-232 devices. Ports are Programmable to support EIA-232 protocols, at a line speed of 128K bps.
Attributes provided: 2 Asynchronous Ports
Attributes required: One PCI Slot
For 9117-570: (#5723)
Minimum required: 0
Maximum allowed: 4 (Initial order maximum: 4)
OS level required: AIX V5.2 or higher o Linux-Refer to the following Web site for Linux information:
factsfeatures.html
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