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 Disk Storage SW Support
Created by Guest
Created on Mar 21, 2023

RELATED IDEAS

Additional information about the status of Cache Fast Write

Currently there is no easy way to be sure, that Cache Fast Write(CFW) is not used on your system. But in the event of an hyperswap CFW can be a problem. Therefore every customer should know their configuration. The problem is that the "DEVSERV P" command can state that CFW is enabled eventhough it is not used and therefore lead to some confusion.

Concluded: It is possible that DEVSERV states CFW is enabled even if it is not honored when disks are in a PPRC relationship. 

Furthermore there are programms that exploit CFW, for example SORT. Jobs using SORT could therefore be affected while a hyperswap occurs. Most of the time this should be a problem, but is still is not what we want. 

In our opinion there should be a HealthCheck which explains that CFW is enabled, but will not be honored. 

Idea priority Low
  • Guest
    Reply
    |     May 17, 2023
    Today the z/OS Resource Measurement Facility (RMF) writes SMF Record Type 74 Subtype 5 fields that clients can check periodically to see if there were Cache Fast Write I/O requests and if the values increase over time.

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.