When the Global Mirror function encounters an I/O error, the message text provides the following information:

device_number

The device number to which the I/O is directed.

abbreviated_error_description

A short error code describing the type of error based on the sense information. The valid codes are:

BOC

Bus out parity check

CMD

Command reject

COR

Correctable data check

DCK

Data check

ENV

Environmental data present

EOC

End of cylinder

EQC

Equipment check

FPR

File protect

IMP

Imprecise ending

ITF

Invalid track format

LOG

First error log

M23

MR23 record

MTO

Message to operator

OVR

Overrun

PRM

Permanent error

RIW

Request inhibit write

VIO

Intent violation

WRI

Write inhibited

WRO

Write operation

***

Unknown

failing_CCW_command_code

The channel command word (CCW) code that encounters the I/O error.

failing_CCW_position

The position in the channel program chain on which the error occurs. If the error occurs at the first CCW in the chain (a Define Extent), the path to the storage control or device can have been dropped. This can indicate an operations error because of the storage path being removed.

IOS_completion_code

The return code from IOS.

subchannel_status

The channel status word status field received from the subchannel.

sense_data

The sense information returned from the operation. See the storage control reference information for interpretation of the sense data.

serial_number

The volume serial number of the device that encountered the I/O error.

full_error_description

A brief description of the cause of the I/O error based on the sense data. See message ANTP7029E for an explanation of these descriptions.