Memorex LOCK - VERSION 2-24 Informacje Techniczne Pobierz pdf (Strona 327)

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101

Restarting From a Checkpoint

User Reference

Use Pursuant to Company Instructions

7-59

JCL Functions

Restarting From a Checkpoint

Description To prepare to restart programs from a checkpoint:

1. Close all output datasets using TSIDMNT or Online Manager

CLOSE function.

2. Use the console log to determine which input and output tape

volumes have been used and which checkpoints have been taken.

DSN Catalog All datasets must be cataloged. Start Track 1 datasets cannot be used with

checkpoint/restart. You must specify the SYS number in the catalog entry

for disk datasets. You can also specify the SYS number for tape datasets.

JCL

Requirements

To prepare the restart job:

1. Verify that you use the same job name, supervisor, and partition.

2. Execute TSIDASS RSTRT in the step just prior to VSE

RESTRT. See “

Pre-Open Processing (TSIDASS)” for additional

information.

3. Define each controlled dataset in the TSIDASS RSTRT step.

Remember that all the output datasets are now the current

versions in the DSN Catalog. Therefore, you must submit all

output RSTRT statements first and the input statements last.

4. For tape, specify the volume sequence number on the label, if you

restart with volume 2 or later. If you are processing a

multi-dataset group, BIM-EPIC positions the tape automatically.

You must inhibit LUB allocation

5. For disk, supply the EXT parameter to identify the last extent

opened.

6. Follow the TSIDASS step with VSE ASSGN statement for the

checkpoint dataset. Use the logical unit number that was used

when the dataset was opened in the previous execution. The

logical unit numbers can be found in the EP039 and EP053

messages that were displayed in the failing job.

7. Assign the SYS number used for the checkpoint dataset with VSE

ASSGN if checkpoints are not embedded in the output dataset.

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