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The system identifies adapter interfaces to a system bus and
the associated devices by an I/O path. The I/O path is
the address of the interface hardware and the physical path to reach a device.
When the system is reset or the power is turned on, hardware
routines read and initialize the I/O paths needed to boot the system.
These boot paths consist of the primary boot path, for booting from
disk-resident software; the alternate boot path, for booting from
a system load tape; and the console boot path, for locating console
operator intervention.
Boot paths for the primary boot device, the alternate boot
device, and the console are shown as numbers separated by periods
or forward slashes.
There are several ways to determine the I/O path for devices
that are attached to the system:
Generate a list of paths for devices that have already been
configured by using the LPATH command of the SYSGEN utility IO
Configurator. SYSGEN does not tell you if the configured device is
active or available. During the system boot (using the ISL
START command), information on which paths have been configured
and which devices are available or not available is listed as the
"System State at Boot Time." (For more information on the system
state, refer to Chapter 3 "System Startup
Functions" and Appendix B "Startup, Dump, and
Shutdown Listings" For more information on SYSGEN, refer to
Chapter 4 "Using the System Generator
(SYSGEN)")
Use the ISL utility, IOMAP, to list the devices on the
system. (For more information on IOMAP, refer to
Appendix E "Verifying Attached Devices") For
9X8LX and 9X8RX systems, use the ODE utility to list devices on the
system.
For the N-class and A-class systems, the BCH (Basic Console
Handler) SEA command in the Main Menu lists the disk and tape devices
physically present on the system.
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