06F
Explanation
The system found one of the following along a path to a device:
- An inoperative control unit
- A channel error
- An undetermined error
There is no device reservation or active I/O operation on the path to indicate which system owns the device.
If the system could not determine the channel path identifier and/or device number, the system substitutes X'FFFF' for the channel path identifier and/or device number.
System action
The system:
- Disables the device.
- Enters wait state X'06F' because it cannot issue message IOS427A.
- Expects an operator action, but does not prompt the operator for a reply.
Operator response
Do the following:
- Find the address of the error information by using the hardware Alter/Display facility to display the contents of location X'40C'. Record the first 4 bytes of data at this location.
- Use the hardware Alter/Display facility to display the storage pointed to by location X'40C'.
Note: This is indirect addressing.The system displays the contents of the error information area:
- Offset 0
- The channel path identifier (or X'FFFF', if the CHPID could not be determined).
- Offset 2
- The device number (or X'FFFF', if the device number could not be determined).
- Use the hardware Alter/Display facility to change location X'30E' to one of the following
recovery codes:
- Code
- Explanation
- 00
- Try to restart the device without attempting recovery. (Entering this code is the same as
replying NOOP to message IOS427A). If the problem persists, the system issues
message IOS427A again (or wait state code X'06F' if the system cannot issue IOS427A); consider
entering one of the other recovery codes.
Use the Restart facility to restart the waiting processor.
- 01
- Attempt to recovery access to the device through an alternate channel path. (Entering this code
is the same as replying UR to message IOS427A). Before entering this recovery
code and restarting the processor, all other processors that share the device you must prevent from
initiating I/O to this device by issuing the IOACTION STOP command. If this command fails, you must
stop all sharing processors to prevent I/O activity to the shared device. Use the Restart facility to restart the waiting processor. The system might issue one of the following messages:
- IOS428I - The attempt to access the device through an alternate channel path was successful.
- IOS104I - The attempt to access the device through an alternate channel path was not successful.
After the system issues either message, start I/O to the shared device either by issuing the IOACTION RESUME command or by restarting the sharing processors if they were stopped in step 11.
- 02
- Force the device offline. (Entering this code is the same as replying BOX to message IOS427A). The system issues message IOS501I. Use the Restart facility to restart the waiting processor.
See message IOS427A in z/OS MVS System Messages, Vol 10 (IXC-IZP) for additional information.
Source
Input/output supervisor (IOS)