Hallo To All,
 
I am trying to track down a problem of a missing dataset.  The dsn was used by 
a STC however for some unexplainable reason it "disappeared".  In the STC the 
dsn is DISP=SHR.  I checked all the SMF records -TYPE 17, 18, 61, 62, 63, 64, 
65, 67, 68, 136, 138 & 139- but there is no record of it having been deleted.  
My suspicion is HSM.  I checked the ACTIVITY logs for 2 weeks however there is 
no trace of the dsn being deleted i.e. ACTION=DELETED or ACTION=SCRATCH or 
ACTON=EXPIRED.  According to the MANAGEMENT CLASS which has the following 
expiration attributes:
Expiration Attributes                          
                                               
  Expire after Days Non-usage  . : 540         
  Expire after Date/Days . . . . : NOLIMIT     
  Retention Limit  . . . . . . . : 0           
                                               
My understanding is that even though the dsn could be expired after 540 days, 
since there is a NOLIMIT, this would override the Expire after Days Non-usage 
of 540 days.  Please correct me if my understanding is skewered.  Also, could 
any one suggest where else I could look for the cause of the missing dsn?
 
Thanks in advance for your help.

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