Parameters

STOP,DEV: The system stops all I/O activity to the specified DASD. The system allows several seconds for current activity to complete. You do not have to enter the parentheses when specifying only one device. The system displays message IOS601I to remind you that I/O activity is stopped to specified DASD. To display stopped DASD, enter DISPLAY IOS,STOP.
Note: Before stopping a device, enter D U,DASD,ALLOC,devnum to determine what data sets will be affected. If any system-owned data sets, such as SYS1.LINKLIB, are stopped, the system will be affected.
RESUME,DEV: The system resumes normal I/O activity to the specified devices. When ALL is specified, I/O activity is resumed on any device that had been stopped by an IOACTION STOP command on that system. You do not have to enter the parentheses when specifying only one device.
[/]devnum: The device number of a DASD for which the system is to stop or resume I/O activity. You do not have to enter the parentheses when specifying only one DASD.
[/]lowdevnum-[/]highdevnum: The lower device number lowdevnum and the upper device number highdevnum of a range of DASDs for which the system is to stop or resume I/O activity. You do not have to enter the parentheses when specifying only one range of DASDs.

A device number is 3 or 4 hexadecimal digits, optionally preceded by a slash (/).

Example 1:

To stop I/O activity to device numbers 1A0 through 1AF, enter:

IO STOP,DEV=(1A0-1AF)

Example 2:

To stop I/O activity to device number 1B0, enter:

IOACTION STOP,DEV=1B0

Example 3:

To resume I/O activity to device number 1B0 and device numbers 1A0A through 1AFA, enter:

IO RESUME,DEV=(1B0,1A0A-1AFA)

Example 4:

To resume I/O activity to device number 3480, enter:

IO RESUME,/3480

Example 5:

To resume I/O activity to all devices previously stopped, enter:

IO RESUME,ALL