DY46964: MPC ACTIVATION FAILS WHEN ONE WRITE OR READ SUBCHANNEL IS NOT OPERATIONAL.

Obtain the fix for this APAR

APAR status

• Closed as program error.

Error description

• MPC activation fails when one write or read subchannel is not
  operational. In this case condition code 3 was received in
  response to SSCH because the device was not physically there.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All using subarea MPC connections. *
  ****************************************************************
  * PROBLEM DESCRIPTION: MPC activation fails if any of *
  * the WRITE or READ subchannels *
  * are OFFLINE at activation time. *
  ****************************************************************
  * RECOMMENDATION: *
  ****************************************************************
  The problem is summarized as follows:
  1) An MPC connection, configured with two or more READ/WRITE
  subchannels, fails activation if any of the subchannels
  are OFFLINE during activation.
  2) During ACTLINK processing, all of the defined subchannels
  addresses for the MPC link are allocated from VSE.
  The channel allocation is successful even though they
  may be OFFLINE. VSE does not perform channel path
  validation.
  3) After the channels are allocated, channel programs are
  initiated. The OFFLINE subchannels receive a SIO CC3
  indicating they are unavailable.
  4) The ACTLINK request for each OFFLINE subchannel is
  failed. This results in a SENSE 081C0000 being sent to
  the console for the ACTLINK failure. The entire MPC
  LINE is brought down.
  5) This APAR is being taken to tolerate an OFFLINE MPC
  channel at activation. The MPC connection will continue
  with activation as long as one READ and one WRITE
  subchannel have successful ACTLINK processing.
  

Problem conclusion

• ISTTSCM8 - Subroutine ACTLINK has been modified to tolerate
  negative responses. Instead of going into
  a takedown FSM upon receipt of a negative
  response to an ACTLINK, the SCL_STATE for the
  subchannel is set to SCL_INOP state. When all
  the outstanding ACTLINK responses are received,
  a scan is performed to verify there is at least
  one available READ and one available WRITE
  subchannel. Processing continues if an available
  WRITE/READ are found. Otherwise, the MPC
  connection is taken down with sense 081C0000 to
  the ACTLINK (as before).
  ISTTSC8E - Included for maintenance purposes.
  

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:

  UD53407

Fix information

• Fixed component name

  VTAM V4 VSE/ESA

• Fixed component ID

  568606501

Applicable component levels

• RFE6 PSY UD53407

     UP08/11/05 P E421

Fix is available

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