But not any address-space-related subpool such as 229,230,249.

The only storage that persists past the life of an address space is common 
storage.
You need storage in CSA or SQA or above the bar common.

<snip>
I want to make sure the Global storage is protected and can not be 
overridden.
</snip>

I don't know what you mean by "cannot be overridden". It can be 
overwritten by anyone in the right key. It could be freed, maliciously or 
inadvertently, by anyone with suitable authorization. Common storage just 
cannot be freed by an unauthorized program, and assuming it is in a system 
key cannot be written into by an unauthorized program.

<snip>
I understand I can use the ECVT but 
</snip>
Assuming you mean the area pointed to by a slot in the customer anchor 
table pointed to by ECVTCTBL, there is no "but".
It's still common storage. 

Peter Relson
z/OS Core Technology Design


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