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Status Under review
Workspace IBM DS8000
Created by Guest
Created on Jul 17, 2025

RELATED IDEAS

The different pokes for DS8K subsystems should be documented

In DS8K there exist different pokes - which is internal settings that change the default Microcode behavior. A poke is typically set by a DS8K SME based on a case.

But as it could help solve problems for you, you need to know that the poke exists. I don't know how many or what they all do. That is the challenge. 

Here two different known pokes:
paSFGCAllowDelete Allows us to delete volumes even though there exists Safe Guarded Copies - useful after technology refresh. Enables you to completely clear a subsystem after your installation defined grace period. 

fbPprcPortBWLowDivisor permanent set to a value of 2 on shared subsystems in our environment. 
I believe the default is 5? Default caused single links to run as low as 200 MB/s in multi tennant environment as soon as a with duplex pairs and global copy exists on same link. 
With the value of two this is now plus 1200 MB/S. But as always you need to know the full story before you change such a behavior.

A poke with name unknown to me which "Can be set to disable Space Release on DS8A00 subsystems"

 

So my suggestion is to get the pokes documented so users can read up on them.

Idea priority Low

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