IT03156: POTENTIAL PAGE ZERO CORRUPTION BY ONMODE -C BLOCK

APAR status

• Closed as program error.

Error description

• It has been observed that after an 'onmode -c block' the free
  counter of root chunk's page zero is zero.  So the page header
  no longer is intact and any future flushing of this page to
  disk, e.g. for an increased "Maximum server connections" value,
  would cause the root chunk and the server to go down.
  
  You can determine this corruption in an 'oncheck -pP 1 0' output
  whose 'frcnt' value is zero.
  
  This can go unnoticed for a long while on a primary or standard
  server, but a level 0 restore or a backup of such corrupted
  system, e.g. for setting up a secondary server, would cause
  assertions soon after it finished.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users.                                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Update to IDS-12.10.xC5                                      *
  ****************************************************************
  

Problem conclusion

• Problem Fixed In IDS-12.10.xC5
  

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:

Fix information

• Fixed component name

  INFORMIX SERVER

• Fixed component ID

  5725A3900

Applicable component levels

• RC10 PSY

     UP