This problem is caused by various address spaces terminating with latent
cross-memory connections which leads z/OS to mark the address spaces
'non-reusable'.

To find out which address spaces are causing the problem you have at
least 3 choices :

(1) Install freeware MXI 4.3 (or the commercial MXI G2) from the link in
my signature and run the MDQ command (using either the batch or ISPF
interface) - this will show all non-reusable address spaces and the
reasons for them being marked so.
(2) Install SHOWZOS from the CBT tape site (www.cbttape.org). This
program has a similar display to MXI
(3) Take a in-flight dump of the PCAUTH address space and follow the
information specified in IBM Info APAR II08563.

(1) and (2) require you to install the software in APF-auth libraries as
the information is gathered from the PCAUTH address space.

(3) requires a bit of effort on your part and some IPCS control block
chasing.     

Of course, there might be a extra option (4) if you have another
ISV-supplied z/OS monitor that has a simlar display - I am not familiar
with any of the other ISV tools (eg BMC, CA, Candle etc) to point you to
any.

The most common cause of non-reusable ASIDs that I have seen is sites
that insist on recycling DB2 subsystems on a regular basis - the DB2
address spaces terminate with a latent cross-memory connection to the
RRS address space. These can be released with a forced restart of RRS
(SETRRS CANCEL) - but this is not the sort of thing that production
environments allow.

Rob Scott
Rocket Software
http://www.rs.com/portfolio/mxi/

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