Explanation
You must reply to this message in a timely manner. The
processor is in a disabled status until this message is replied to
as it is issued through Disabled Console Communication Facility (DCCF).
If you do not reply within five minutes, there could be an impact
to sysplex communications, processor availability, and ultimately
a required IPL of the system.
The system detected hot I/O on
a direct access storage device (DASD) or assignable device. The last
interruption for the device was over the specified channel path. IOS112D
is issued through DCCF processing when a DASD device is found on the
channel path undergoing recovery, or message IOS118A was issued but
a response was not received within 5 minutes.
In the message
text:
- devn
- The device number. The device number is prefixed by the subchannel
set identifier when appropriate.
- chp
- The channel path identifier (CHPID).
- aaaaaaaa
- The status collection data control block (SCD) address.
- nnn
- The number of devices with hot I/O on the specified channel path.
System action
The system leaves the device with its status pending.
This prevents the device from presenting any additional interruptions
until further operator action.
Depending on the operator reply
to this message, the system does one of the following:
- Response
- Action
- NONE
- The system simulates an interruption. The system clears the pending
status. The system continues processing. The device remains online.
- DEV
- The system boxes the device, as follows:
- The system ends I/O on the device.
- New I/O requests result in permanent I/O errors.
- The system performs no new allocations for the device.
- If the device was online, the system marks it pending
offline. A pending offline device goes offline when the following
conditions occur in this order:
- The device is no longer allocated to any job.
- Allocation processing allocates any device in the system.
- If the device was offline, it remains offline.
- CU
- The system boxes the devices specified in the reply. The system
leaves the devices specified in the reply status pending.
- CU,K
- The system tries to recover the control unit. If recovery is
successful, the system:
- Issues message IOS208I
- Leaves the channel path online
- Clears the pending status of the cleared device
If recovery is not successful, the system issues message IOS207I. This
response is only valid if CU,K is displayed in the message text as
a valid response.
Only devices connected to the control unit
of the same device will be affected by recovery.
- CHP,K
- The system attempts to recover the channel path. If channel path
recovery is successful, the system:
- Issues message IOS203I
- Leaves the channel path online
- Clears the pending status of the cleared device
If channel path recovery is not successful, the system issues
message IOS202E. The system forces the channel path offline. Note: If
the user indicated to box devices via the HOTIO BOX_LP option in the
IECIOSxx parmlib member, then the device may become boxed instead
of undergoing channel path recovery processing.
- CHP,F
- The system forces the channel path offline. The system issues
message IOS202E.
Operator response
When this message is issued before the MVS™ Console becomes active, it is EXTREMELY
IMPORTANT to respond promptly. This message is issued as a synchronous
WTOR during early IPL processing, which will prevent the system from
updating its status on the sysplex couple data set. This, in turn,
could lead to Sysplex Failure Management (SFM) deciding that the system
is not responding normally, and removing it from the sysplex.
Note: DO
NOT reset the control unit. This could cause reserves or assigns
to be lost to other processors.
System programmer response
Automation of hot I/O recovery is
strongly suggested. When operator involvement is chosen in the IECIOSxx
setting, the operator must respond to these messages before
systems are impacted. See the HOT I/O section of the IECIOSxx parmlib
in z/OS MVS Initialization and Tuning Reference.
Source
Input/output supervisor (IOS)
Module
Routing code
Descriptor code