Explanation
The system does not know if a device is available
or unavailable.
In making the device available, the system boxed
the device because the device is:
- Online
- Allocated
- In use by a system component
- A JES3 device that is assigned or reserved
In the message text:
- dev
- The device number.
System action
The system issues message IOS150I or IOS151I before
this message. The system marks the device boxed and not connected
to the system, as follows:
- The I/O on the device is ended.
- Any new I/O requests result in permanent I/O errors.
- The system does not perform 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.
Operator response
To recover a boxed device, do the following:
- Vary the boxed device offline to all sharing systems.
- Isolate the failing control unit for repair.
- Determine the range of affected devices.
- Contact hardware support.
- Bring the device online to allow hardware support personnel to
verify the data on the boxed device. Do one of the following:
- Enter a DISPLAY U command to see if the device is one of the following:
- Offline and boxed (F-BOX)
- Allocated and boxed (A-BOX)
- If the device is offline and boxed, vary the device online by
entering the following command:
VARY dev,ONLINE
- If the device is allocated and boxed, display the using job steps
that are allocated to the device by entering the following command:
DISPLAY
U,,ALLOC,dev,1
Follow your installation's
procedures for unallocating using job steps.
Vary
the device offline, using the following command:
VARY dev,OFFLINE
Vary
the device online, using the following command:
VARY dev,ONLINE
- Verify the data on the volume.
- Identify and recover failing tasks.
Source
Input/output supervisor (IOS)
Routing code
Descriptor code