IV84212: LU READS MAY DETECT BAD DATA WHILE LU MOVE IN PROGRESS

APAR status

• Closed as program error.

Error description

• **************************************************************
  * USERS AFFECTED:
    * Systems running
    * VIOS 2.2.3.x with pool.basic.rte below the 6.1.9.47 level or
    * VIOS 2.2.4.x with pool.basic.rte below the 6.1.9.102 level.
    **************************************************************
    * PROBLEM DESCRIPTION:
    * This affects users of VIOS 2.2.4 utilizing Shared Storage
    * Pools and the lu -move feature.
    *
    * When using VIOS SSP lu -move, while I/O is active to the LU
    * being moved, a read operation to the LU may read incorrect
    * data.
    *
    * There is a possibility of seeing these issues on earlier
    * VIOS levels but only if an SSP LU is exported to multiple
    * clients running an application that actively uses the
    * shared disk on both clients at the same time.
    **************************************************************
    * RECOMMENDATION:
    * Install APAR IV84212.
    * Prior to fix availability, an interim fix is available from
    * either
    * ftp://aix.software.ibm.com/aix/ifixes/iv84212/
    * https://aix.software.ibm.com/aix/ifixes/iv84212/
    * Installation of the ifix requires a reboot.
    **************************************************************
  

Local fix

Problem summary

•   **************************************************************
    * USERS AFFECTED:
    * Systems running
    * VIOS 2.2.3.x with pool.basic.rte below the 6.1.9.47 level or
    * VIOS 2.2.4.x with pool.basic.rte below the 6.1.9.102 level.
    **************************************************************
    * PROBLEM DESCRIPTION:
    * This affects users of VIOS 2.2.4 utilizing Shared Storage
    * Pools and the lu -move feature.
    *
    * When using VIOS SSP lu -move, while I/O is active to the LU
    * being moved, a read operation to the LU may read incorrect
    * data.
    *
    * There is a possibility of seeing these issues on earlier
    * VIOS levels but only if an SSP LU is exported to multiple
    * clients running an application that actively uses the
    * shared disk on both clients at the same time.
    **************************************************************
    * RECOMMENDATION:
    * Install APAR IV84212.
    * Prior to fix availability, an interim fix is available from
    * either
    * ftp://aix.software.ibm.com/aix/ifixes/iv84212/
    * https://aix.software.ibm.com/aix/ifixes/iv84212/
    * Installation of the ifix requires a reboot.
    **************************************************************
  

Problem conclusion

• Internal retry on read after partial read uses wrong buffer
  address. If we are doing the retry after partial read then
  discard the previous partial read.
  

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:

Fix information

• Fixed component name

  AIX 610 STD EDI

• Fixed component ID

  5765G6200

Applicable component levels

• R610 PSY U868846

     UP16/10/25 I 1000 Ž