The BS2000 I/O tables are dynamically constructed on startup.
The channel peripherals (SUs /390) are determined from the active IOCF.
The bus and Fibre Channel peripherals (SUs x86) are determined via X2000.
The configuration state is now determined in the following sequence on startup:
From the presettings for the bus periphery (SUs x86):
ATTACHED:
Consoles, network/LAN devices, devices from the '50' family and all disk devices; an optional REP can be used to generate disks as DETACHED by default.
DETACHED:
All other devices.
The configuration states of the devices connected to SUs /390 are taken over from the IOGEN data in the IOCF. The default settings for the channels controllers and all connections are:
ATTACHED:
Channels and cluster controllers
INCLUDED:
All connections between the hardware units
From the startup parameter service (IOCONF) by means of the statements:
MOD-IO-UNIT
Define configuration state for a hardware unit
MOD-IO-PATH
Define configuration state for a connection
By means of automatic reconfiguration during startup:
ATTACHED:
All home pubset disks, paging disks, IPL console
DETACHED:
All tape devices
The implicit states of all the hardware units and connections are determined.
The keyword for modifications to configuration states is IOCONF.
The maximum number of parameter records permitted for this is 256.
Incorrect parameter records are ignored. When startup has terminated, the message NDI0550 is output. This reports the number of received parameter records and the number of incorrect records. The message NDI0551 outputs up to 10 incorrect records together with information about the type of error in question.
The values set by means of the parameter service apply to the current session.
instruction | Meaning |
MOD-IO-UNIT | Modify configuration state of a hardware unit |
MOD-IO-PATH | Modify configuration state of a connection between hardware units |
Table 4: Overview of the statements for the IOCONF parameter record