IJ23222: NPIV I/O HANGS AND/OR TIMEOUTS ON VIOS 3.1.1

APAR status

• Closed as program error.

Error description

• **************************************************************
  * USERS AFFECTED:
  * Systems running VIOS 3.1.1.x with
  * devices.vdevice.IBM.vfc-server.rte at 7.2.4.0.
    **************************************************************
  * ERROR DESCRIPTION:
  * This is only an issue using NPIV with VIOS 3.1.1.
  * Client LPARs can experience I/O hangs and timeouts under
  * heavy I/O load.
  * We have seen this issue primarily during database backups,
  * but can occur with any large sequential I/Os at high rates.
    **************************************************************
  * RECOMMENDATION:
  * Install APAR IJ23222.
  * Prior to fix availability, an interim fix is available from
  * either
  * ftp://aix.software.ibm.com/aix/ifixes/ij23222/
  * https://aix.software.ibm.com/aix/ifixes/ij23222/
  * Installation of the ifix requires a reboot.
    **************************************************************
  

Local fix

Problem summary

• On VIOS 3.1.1, a vfchost driver may get into a state where it
  stops processing I/O requests from the client.
  

Problem conclusion

• Correctly calculate resources needed for I/O request.
  

Temporary fix

•   *********
    * HIPER *
    *********
  

Comments

APAR Information

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

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

  IJ23377

Fix information

• Fixed component name

  VIRTUAL I/O SER

• Fixed component ID

  5765G3400

Applicable component levels