<snip>
Is it recommended to do a dynamic LINKLIST during a peak production hours 
?
Will there be any impact to the system during that time as we stop LLA as
well.
</snip>

I agree with all the responses.

The real answer depends on what the OP means by "do a dynamic LINKLIST". 
If it means only "define and activate a new LNKLST set", then there is no 
problem. That is the design point for the dynamic LNKLST function. I think 
of "LNKLST update" as "unpredictably dangerous", both for the module 
mismatch case that Tom M mentioned and for the cases where you rip things 
out from underneath a fetch-in-progress or where PDSE operations are 
involved (which can have longer durations iof sensitivity) -- the DELAY 
option of LNKLST UPDATE should be considered for any use of UPDATE. 

There is potentially significant performance impact to any system if you 
"stop LLA". But activating a new LNKLST set does not require stopping LLA. 
You should not stop LLA if activating a new LNKLST set.

Peter Relson
z/OS Core Technology Design


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