<snip>
One problem we've seen is that sometimes when HZSPROC starts during an
IPL, it for some reason seems to try to access a migrated dataset (we use
FDRABR for dataset migration) and since DFRMM hasn't started yet the recall
fails. (We don't know what dataset it is trying to access; none of the
datasets explicitly in the PROC ever migrate.) Everything seems to freeze
until we reply "CANCEL" to the EDG4012D message.
</snip>

If a particular health check does an allocation/open that results in attempting 
to recall a migrated data set and results in a WTOR, that particular task would 
wait for response, but that would have no effect on the running of other checks 
(HC has 20 tasks available for running of checks; only the single task running 
the check would be held up). The RACF_SENSITIVE_RESOURCES check does check on 
the existence of APF-authorized data sets. So perhaps doing that checking does 
result in recalling the dataset in order to do that validation. I don't know if 
the recall (versus do not recall) is intentional or an oversight; I will be 
asking that question of the owners.

In any case, there would be no effect on the rest of the HZSPROC address space 
or the rest of the system.

Peter Relson
z/OS Core Technology Design


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