CSCH and HSCH trace records

CSCH and HSCH records represent a clear subchannel operation and a halt subchannel operation.

Record Formats

CSCH.... shhhh   ASCB.... hhhhhhhh CPUID... hhhh     JOBN.... cccccccc
                DEV..... hhhh     SFLS.... hhhh     SID..... hhhhhhhh
                CC...... hh       DVRID... hh       ARDID... hh
                IOSLVL.. hh       UCBLVL.. hh
                UCBWGT.. hh       BASE.... shhhh

HSCH.... shhhh   ASCB.... hhhhhhhh CPUID... hhhh     JOBN.... cccccccc
                DEV..... hhhh     SFLS.... hhhh     SID..... hhhhhhhh
                CC...... hh       DVRID... hh       ARDID... hh
                IOSLVL.. hh       UCBLVL.. hh
                UCBWGT.. hh       BASE.... shhhh

CSCH shhhh

HSCH shhhh

Device number from the UCBCHAN field of the UCB, which includes the subchannel set identifier when appropriate.

ASCB hhhhhhhh

Address of the ASCB for the address space that started the I/O operation.

CPUID hhhh

Address of the processor on which the I/O operation started

JOBN cccccccc

One of the following:

cccccccc: Name of the job associated with the task that requested the I/O operation
N/A: No job is associated with the requested I/O

DEV hhhh

Device number from the UCBCHAN field of the UCB.

SFLS hhhh

Start flags from the UCBSFLS field of the UCB.

SID hhhhhhhh

Subchannel ID from the UCBSID field of the UCB.

CC hh

CSCH or HSCH condition code in bits 2 - 3.

DVRID hh

Driver ID value from the IOSDVRID field of the IOSB.

ARDID hh

One of the following:

hh: Associated request driver ID from the IOSDVRID field of the IOSB
U/: Unavailable because the IOQ was unavailable

IOSLVL hh

Function level to provide serialization of I/O requests. This value comes from the IOSLEVEL field of the IOSB.

UCBLVL hh

UCB level value from the UCBLEVEL field of the UCB.

UCBWGT hh

Flags from the UCBWGT field of the UCB.

BASE shhhh

Device number from the UCBCHAN field of the UCB, which includes the subchannel set identifier when appropriate.