Explanation
The system found a hot I/O condition on the specified
channel path on a device. The installation specified the recovery
action in the hot I/O detection table (HIDT).
In the message
text:
- rrrrr
- The recovery action obtained from the HIDT, which is one of the
following:
- BOX
- Force the device offline.
- CHP,K
- The system attempted channel path recovery. If recovery is successful,
the channel path remains online.
- CHP,F
- Force the channel path offline.
- CU,K
- Try to recover the control unit.
- tttttttt
- The type and status of the device. It is either RESERVED or ASSIGNED.
If this field is blank, the status of the device is not reserved.
- dev
- The device number. The device number is prefixed by the subchannel
set identifier when appropriate.
- chp
- The channel path identifier (CHPID).
System action
Depending on the value of
rrrr,
one of the following:
- rrrr
- System
Action
- BOX
- The system boxes the hot 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 can get the necessary resources to process the request.
- If the device was offline, it remains offline.
- CHP,K
- The system attempts to recover the failing channel path. If any
devices are reserved or assigned on the channel path, the system issues
message IOS062E.
If channel path recovery is successful, the system
issues message IOS203I. The system leaves the channel path online.
If
channel path recovery fails, the system issues message IOS202E. The
system forces the channel path offline.
- CHP,F
- The system forces the channel path offline. If any devices are
reserved or assigned on the channel path, the system issues message
IOS062E. The system issues message IOS202E.
- CU,K
- The system tries to recover the control unit. If recovery is
successful, the system:
- Issues message IOS208I
- Leaves the device paths online for all devices on the
same control unit
- Clears the pending status of the cleared device
If recovery is not successful, the system issues message IOS207I. Note: This
response is only valid if CU,K is displayed in the message text as
a valid response.
Operator response
Disable the device if:
- The device recovery action is BOX.
- You can physically disable the device
- The device is not a direct access storage device (DASD) or assigned
device. In this case, do not disable the device; reserves or assigns
could be lost.
See the operator response for message IOS102I, IOS202E, or IOS203I.
Source
Input/output supervisor (IOS)
Routing code
Descriptor code