>I've never understood why a wait-stated system needs to be system reset. 
>I can't see any harm in a system reset, but really, does anyone know why
>it's done? If so, we need to retrain all our operators. ;-)

System reset needs to be done to get rid of possibly hung RESERVES that
were/are not cleared when the system is wait stated (or so I was told).

System reset is done automagically in a parallel sysplex (note the parallel
- the CF needs to be there) for all systems except the last one when an SFM
policy is active. No special automation is needed here. The system reset is
done via the CF. This is called 'Isolation'. It cannot be done for the last
system, so has to be done manually for that one last system. If you always
get that message it indicates some problem either in setup or with some
ptfs, so one should go investigate.

IXC402D is issued when either a system is not responding anymore to the CDS
OR via signalling (I almost had a heart attack when I saw a life occurance
of that one for the first time) or when there is no SFM policy. This was
part of an original recovery procedure as far back as I can remember XCF
being there.

The original message text was 'Reply down when MVS is down', and "down"
wasn't really defined. I believe that around that time the RESERVE problems
first surfaced. My standard chant in those days was 'You have to system
reset before replying DOWN'. The message text got changed later to include
the phrase 'when system has been system reset'.

Hope that helps (and I didn't sound too much like re-hashing the past).
Regards, Barbara

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