OW05684: DSPU STAYS IN PCTD2

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Several DSPU's are remain in PCTD2 after VTAM INACT/ACT.
  Asy. channel status will not be processed correctly. it appears
  that the DE will be lost within vtams ios.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All with Down Stream PUs (DSPUs) hung off of *
  *                 a 3174 PU 2.0.                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: DSPUs off of 3174s hang in PCTD2 state. *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The scenario is as follows:
  
  1) a CONNECT is sent to a DSPU off of a 3174.
  2) the 3174 responds DE/UC
  3) MVS issues a SENSE CCW on VTAM's behalf.
  4) 3174 responds with sense Not Initialized and Abort
  5) a DSPU now wants to become active and 3174 sends in
     Asynchronous DE/UC
  6) MVS issues a SENSE CCW on VTAM's behalf.
  7) 3174 responds with sense Not Initialized - this
     is a wake up to VTAM to reissue the connect in 1).
  8) the Asynch DE/UC in 5) is processed in VTAMs Attention
     routine running in Master's ASID and processing completes
     BEFORE the interrupt for the CONNECT in 1).
  9) As VTAM's attnetion routine thinks the device is
     busy (NCBBUSYF=1 because the interrupt in 1) hasn't
     completed), the Asynch DE/UC to wake up the device is
     discarded.
  10) the device hangs in PCTD2.
  
  Normally, the interrupt from the CONNECT in 1) will complete
  before the Asynchronous DE/UC in 5).
  
  VTAM needs to remember that this ASYNCH DE/UC has come in
  if the device is in Contact Pending state.
  

Problem conclusion

• ISTTSCLA has been changed to remember the Asynchronous DE/UC
  with sense of Not Initialized when it is received in Connect
  Pending state (x'04').  When the NCBPUPAB (ISTTSC2I) processes
  the completion of the CONNECT CCW it will check to see if
  the Asynchronous DE/UC has been received.  If it has, a new
  CONNECT CCW will be issued.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UW08317 UW08318 OW07143

Modules/Macros

• ISTICNCB ISTTSCLA ISTTSC2I
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R101 PSY UW08317

     UP94/08/10 P F408

• R201 PSY UW08318

     UP94/08/26 P F408

Fix is available

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