Definition of 4B21I


4B21I P CHAN DATCK SYSnnn=cuu TI=xxxx DC=dddddddddd DECB=aaaaaa
Cause: A parity error, indicated by the Channel Status Word (CSW), was detected on the
This is probably a hardware error.
System Action: see the preamble to this section.
Programmer Action: none.
Operator Action: If the problem persists, issue the ROD command, execute EREP (see
DOS/VS SADP), and have the
· output
· system log
· system dump, if provided
available for problem determination.

Used with Courtesy and Permission of International Business Machines, Inc.