OA47307: MPC HANGS PREQC STATE AT ACTIVATION. LOGS SHOW IST574E AND INOP ON THIS SIDE - INOP AND VARY INACT ON THE OTHER SIDE.

APAR status

• Closed as fixed if next.

Error description

• MPC activation logs/dumps show:
  SideA:  IST574E Read device
          IST1222I Read device INOP
          IST1578I INOP ISTTSCXI CODE 104
          Activation is hung
  SideB:  IST1222I Write device INOP
          IST1578I INOP ISTTSC8X CODE 022
          IST1578I INOP ISTTSC8X CODE 009
          IST1136I VARY INACT SCHEDULED
          MPC becomes inact
  ----
  The doc is showing XID0's were exchanged successfully - but an
  error occurred on subsequent XID7 exhanges. This is not
  expected - and both sides should have become INACT at this
  point.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All using MPC/AHHC connections.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * MPC HANGS PREQC state after XID7 timeout.                    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * FIN                                                          *
  ****************************************************************
  The problem may be summarized as follows:
  1) An MPC/AHHC connection is being activated.
  2) The XID0 exchanges over the subchannels is successful.
  3) The low side of the connection initiated XID7 exchange.
  4) In this failure, message IST574E indicating a START I/O
  TIMEOUT occurred for the read subchannel.
  5) After this failure, the MPC/AHHC connection hung incorrectly
  hung in PREQC state.
  
  NOTE: The root cause of the I/O failure will need to be
  investigated and corrected.  However VTAM should have
  inactivated the MPC PU after the failure occurred.
  

Problem conclusion

Temporary fix

Comments

• The solution for this APAR is included in CS for zOS Version 2
  Release 2.
  

APAR Information

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

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

Fix information

Applicable component levels

• R210 PSN

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