IBM System/370 145 Manual page 216

to avoid total system, direct access facility, or tape subsystem
unavai1ability.
3. CE diagnosis routines. .More exacting CE diagnosis routines are
available.
The following maintenance and diagnostiC routines are provided:
• Online Test Executive program (OLTEP) and Online Tests (OLT's) for
operation under
OS
and
DOS
control to test malfunctioning I/O
devices concurrently with system operation
• Microdiagnostics for use in diagnosing malfunctioning field-
replaceable units (stand-alone routines)
OLTEP AND OLT'S - OS AND DOS
OLTEP is designed to operate as a processing program under operating
system control. It handles the required interface between the operating
system and the device-dependent OLT's. One OLTEP is provided for
operation under OS and another for execution under DOS. These two
OLTEP's support functions not provided by the currently available OS
OLTEP and
DOS
OLTEP programs for System/360.
The inclusion of OLTEP in an operating system is automatic for a DOS
Version 3 or 4 control program generated for a Model 145 unless OLTEP is
specifically excluded by a system generation parameter. OLTEP is a
system generation option for OS MFT and MVT llsers. A standalone version
of OLTEP, called OLTSEP, is available as well. OLT's are obtained from
the software customer engineer.
OL"I"EP directs the selection, loading, and execution of device-
dependent OLT's for the purpose of I/O device testing and error
diagnosis. OLTEP is also designed to verify I/O device repairs and
engineering changes.
As with any other job step, OS OLTEP is inVOked with job control and
executes with a user-assigned priority. A minimum program area of 28K
is required for OLTEP operation in
os
MFT and MVT environments. DOS
Version 4 OLTEP, also inVOked via job control statements, operates only
in the background partition in a minimum of 14K and cannot be run with a
6K supervisor. The input stream or system console device can be used to
supply the parameters required for test operations (devices to be
tested, options desired, etc.). Both OS OLTEP and QOS OLTEP ensure the
protection and security of user data files and storage in use while
OLT's are operating. OS OLTEP also ensures that the devices to be
tested are online or offline (as far as the operating system is
concerned) as required by the particular device type.
The OLTEP's for OS and DOS have the new capability of being able to
access history records describing previous I/O errors on the device
being tested. In addition, multiple devices can be tested during one
OLTEP execution. If a console is used to define the test run, the new
prompting facility can be requested as an aid to the user supplying the
definition.
OLTEP and the OLT" s reside in a
005
core image library. In OS MFT
and MVT environments, portions of OLTEP reside in both SYS1.LINKLIB and
SYS1 .. SVCLIB. While the OLT's can be placed in a user-designated disk
library (partitioned data set).
OLTEP and OLT's can operate concurrently with other executing jobs in
a multiprogramming environment and provide online I/O devic~ testing,
206
A Guide to the IBM System/310 Model 145