IBM Z Hardware and Operating Systems Ideas 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).


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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.

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

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Status Future consideration
Workspace z/VM
Created by Guest
Created on Mar 17, 2026

RELATED IDEAS

Increase the SET LKFAC limit above 250 users for use by guest operating systems (TPF)

Increase the MPLF virtual DASD locking limit above the 250 user limit using SET LKFAC.

In 1998 the LKFAC limit was increased from 64 users to 250 users (VM61408). One of the reasons for this increase was to allow more TPF guests to run LKFAC to support loosely coupled systems environment testing.

After almost 30 years and a huge increase in the size and power of IBM processors, we are finding this limit restrictive to our TPF test environment running under z/VM. We routinely run 300+ TPF guest and, as we migrate our production TPF to loosely coupled, we would like to have this limit increased.

Idea priority Medium

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