How to add additional journals for dynamic use during peak processing

Products

• IDMS
• IDMS - Database
• IDMS - ADS

Issue/Introduction

During peak processing time at year end, extended batch jobs require additional journals.  Is there a way to dynamically add disk journals when needed?

 

Environment

IDMS - All Supported Releases

Resolution

  The recommendation is to add additional Disk Journal definitions to your CV DMCL permanently.  

  If for example you have 6 Disk Journals defined but you only want to use 4 on a daily basis, you could
have a startup process vary the 5th and 6th Disk journals offline.

  When running the year-end batch jobs in question, you can vary one or both of the extra journal files online.                                

                                                                              

To reduce contention during offload operations, you should:                   

- Place the disk journals on disk packs that do not contain database or dictionary files                                                            

- Assign each disk journal to a different volume          

You should also have an initiator that is dedicated to archive jobs. You      

don't want the archive journal jobs to contend for an initiator with other    

jobs.