Explanation
During system initialization, the system issued
an I/O request to a device. The I/O request included a command that
resulted in an unsuccessful I/O completion.
In the message text:
- dev
- The device number.
- cmd
- The I/O command that caused the error. (For an INTERCEPT condition,
the cmd field will contain asterisks.)
- chp
- The channel path identifier (CHPID). (If the Channel path is unknown,
the chp field will contain asterisks.)
- stat
- The subchannel status word (SCSW) status bytes.
- ser
- The volume label. If the volume label is not available, this
field is blank.
- text
- A variable length text string that is one of the following:
- SENSE FOLLOWS
- This text appears for unit check errors in which the resulting
sense data could be successfully read.
- sssssssssssssssss…sssss
- Up to 32 bytes of the resulting sense data.
- INVALID SENSE DATA
- This text appears for unit check errors in which an I/O error
also occurred while trying to read the resulting sense data.
Note: If
this situation occurs, no second line of message IOS306I is displayed.
- NO SENSE DATA
- This text appears for non-unit check errors. Because the error
was not a unit check, then no sense data exists.
Note: If this situation
occurs, no second line of message IOS306I is displayed.
System action
If the I/O request is critical to the system initialization
process, the system issues message IEA304W and enters a disabled wait
state. Otherwise, the system continues processing.
Operator response
Notify the system programmer of the I/O error
that occurred while the system was reading the volume label for the
specified device.
System programmer response
Contact hardware support.
Source
Input/output supervisor (IOS)
Module
Routing code
Descriptor code