IOS120D

Explanation
The device dev did not respond
to a request to initiate I/O to validate a device path, read self
description data or perform additional device dependent validation.
The
device or control unit timed out (an I/O interrupt expected from a
device or control unit was not returned within the specified time
limit). Possible causes include: The device is shared and is reserved by a processor other than
the initializing processor.
A hardware malfunction has occurred causing the device to appear
busy.
The device or control unit took too long to initialize.

In the message text: devn
The device number. The device number is prefixed by the subchannel
set identifier when appropriate.

System action
The system waits for the operator to reply.

Operator response
Contact the system programmer. Take one of
the following actions: Enter REPLY id, ‘WAIT’ to cause the system to wait
for the device to become available. If the device is still not available
after 15 seconds, the system issues message IOS124A to prompt the
operator again.
Enter REPLY id,‘CONT’ to purge outstanding I/O requests
and mark the device offline. Replying CONT means that the device is
no longer available; processing continues without it. Because the
device is no longer available, replying CONT can cause later errors
if the message is issued during Nucleus initialization processing
(NIP) and the device, such as the SYSRES device, is required for NIP
processing. Thus, reply ‘CONT’ only when the device is
not available because of a hardware problem that can not be corrected
and the device is not required for NIP processing.

While it is also possible to take no action (which the
system considers an implicit ‘WAIT’), do so only at the
direction of the system programmer. Taking no action is an appropriate
response only for a device that times out and is not required for
NIP processing.

System programmer response
Determine the cause of the problem.
If replying WAIT does not resolve the problem, then determine if the
system can continue without the device. If it can, tell the operator
to reply ‘CONT’. If the device is required for NIP processing,
tell the operator to reIPL the system using the appropriate backup
device.

Source
Input/output supervisor (IOS)

Module
IEAVNP02 (NIP), IOSVNPTH (NIP), and IOSVSLFD.

Routing code
1

Descriptor code
2