<snip>
I would suggest using a reusable LX and then make sure the caller can 
locate the sequence number as easily as the PC number(s) 
</snip>

If you're likely to restart and re-connect, there is little benefit to a 
reusable System LX (this is unlike the case for a non-system LX for which 
there is significant benefit to using a reusable LX). 

It is true that if you do use a reusable system LX, then you would go 
through the entire process on restart, starting with LXRES. You would not 
"re-connect".

The Share presentation contained this:
<snip>
If the server terminates and restarts, it would issue AXSET for the new 
space and re-issue ETCON (and thus must make sure that the TKLIST and 
ELXLIST areas are accessible). It would not re-issue LXRES.
</snip>

Note that ETCRE is not mentioned (and it refers to the TKLIST, presumably 
with data from the ETCRE done the first time). I had told someone very 
recently that you don't need to do the ETCRE on restart for a system LX 
that was re-connecting to an LX. I was wrong. On restart, you would do 
both ETCRE and ETCON; for a non-reusable LX you would not have done 
(another) LXRES but would have used the information from the initial LXRES 
(and the new ETCRE) when doing the ETCON.

Peter Relson
z/OS Core Technology Design


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