MODIFY-IO-UNIT (Modify configuration properties of an I/O unit)

PAV devices are not available on SU x86, where the inputs/outputs are automatically parallelized by X2000. The VM2000-specific operands for prioritizing PAV devices in this BS2000 command consequently have no effect on SU x86.

This command allows systems support to modify the configuration properties of controllers or devices dynamically.

Format (VM2000-specific operands)

MODIFY-IO-UNIT

UNIT = *CONTROLLER(...) / *DEVICE(...)
	. . .
	*DEVICE(...)
		|	NAME = <alphanum-name 2..2> / <x-text 4..4> / *RANGE(...)
		|	,STATE = *UNCHANGED / *PREFERRED-PATH(...) / *PAV-PREFERRED-DEVICE(...)
		|		*PAV-PREFERRED-DEVICE(...)
		|			|	,PAV-PREFERRED-DEVICE = *UNCHANGED / *NO / *YES
	. . .

Description of the operands (VM2000-specific operands)

UNIT = *DEVICE(...)
The configuration properties of a device are to be modified.

STATE = *PAV-PREFERRED-DEVICE(...)
Specifies whether the base or alias device should be given preference for I/Os in VM2000 operation.

PAV-PREFERRED-DEVICE = *UNCHANGED
The current setting remains unchanged.

PAV-PREFERRED-DEVICE = *YES
The base or alias device is preferred for I/Os in VM2000 operation.

PAV-PREFERRED-DEVICE = *NO
The preference is canceled.