IBM Z Hardware and Operating Systems Ideas Portal
Hide about this portal


This is the public portal for all IBM Z Hardware and Operating System related offerings. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).


Shape the future of IBM!

We invite you to shape the future of IBM, including product roadmaps, by submitting ideas that matter to you the most. Here's how it works:

Search existing ideas

Start by searching and reviewing ideas and requests to enhance a product or service. Take a look at ideas others have posted, and add a comment, vote, or subscribe to updates on them if they matter to you. If you can't find what you are looking for,

Post your ideas

  1. Post an idea.

  2. Get feedback from the IBM team and other customers to refine your idea.

  3. Follow the idea through the IBM Ideas process.


Specific links you will want to bookmark for future use

Welcome to the IBM Ideas Portal (https://www.ibm.com/ideas) - Use this site to find out additional information and details about the IBM Ideas process and statuses.

IBM Unified Ideas Portal (https://ideas.ibm.com) - Use this site to view all of your ideas, create new ideas for any IBM product, or search for ideas across all of IBM.

ideasibm@us.ibm.com - Use this email to suggest enhancements to the Ideas process or request help from IBM for submitting your Ideas.

Add a new idea Subscribe
Status Future consideration
Workspace z/OS
Categories DFSMS DSS
Created by Guest
Created on Jul 28, 2017

RELATED IDEAS

DFSMSdss DUMP command optimize the default block size for PS-E.

Now DFSMSdss DUMP function makes a output dataset to DASD with half track block size (default). If using 3390 type DASD, default block size is 27998. When output dataset is Extended format (PS-E) , the system adds a 32-byte suffix to each block. So that total size (27998+32=28030) is over half track and remaining amount on the track is 55996 - 28030 = 27966. It is shorter than block size, and it become dead space. If input dataset block size is 27998, output dataset needs double size. If DUMP with encryption function, it become triple size. We want to DUMP function optimize the default block size for PS-E. 27966 is best for PS-E. After optimized block size, output dataset size will become smaller. (3 times -> 1.5 times, 2 times -> near 1 time)

Idea priority High

By clicking the "Post Comment" or "Submit Idea" button, you are agreeing to the IBM Ideas Portal Terms of Use.
Do not place IBM confidential, company confidential, or personal information into any field.