APAR status
Closed as program error.
Error description
************************************************************** * USERS AFFECTED: * Systems running the 7300-01 Technology Level with * any of the following filesets at or between the given levels: * MIN MAX FILESET * 7.3.1.0 7.3.1.2 bos.rte.lvm ************************************************************** * ERROR DESCRIPTION: * Potential undetected data loss can occur on disks larger than * 2 TB if 'chvg -ky' is run to make the VG encryption capable, * or if 'chvg -g' is run on a VG that is encryption capable. * * On AIX 7.3, VGs are created as encryption capable by default. * For encryption capable VGs, 'lsvg <vgname>' will show: * ENCRYPTION: yes * * If the 'chvg' commands above are run, a variable size block * of LVM metadata can overwrite user data on disks in the VG * that are larger than 2 TB. * This can occur during the chvg command execution, and also * could reoccur later if the metadata is updated on disk. ************************************************************** * RECOMMENDATION: * Avoid the above 'chvg' commands until the following fix has * been applied. * Install APAR IJ46542. * Prior to fix availability, an interim fix is available from * either * ftp://aix.software.ibm.com/aix/ifixes/ij46487/ * https://aix.software.ibm.com/aix/ifixes/ij46487/ * Installation of the ifix does not require a reboot. **************************************************************
Local fix
Problem summary
Potential data loss can occur on disks larger than 2 TB if 'chvg -ky' is run to make the VG encryption capable, or if 'chvg -g' is run on a VG that is encryption capable. On 7.3, VGs are created as encryption capable by default. For encryption capable VGs, 'lsvg <vgname>' will show: ENCRYPTION: yes If the commands above are run, a variable size block of LVM metadata can overwrite user data on disks in the VG that are larger than 2 TB. This can occur during the chvg command execution, and also could re-occur later if the metadata is updated on disk.
Problem conclusion
Correct calculation done in chvg code to not overflow with > 2TB disks.
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
IJ46542
Reported component name
AIX V7.3
Reported component ID
5765CD300
Reported release
730
Status
CLOSED PER
HIPER
YesHIPER
Submitted date
2023-04-24
Closed date
2023-04-24
Last modified date
2024-01-12
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 V7.3
Fixed component ID
5765CD300
Applicable component levels
[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SG11T","label":"AIX 7.3 HIPERS- APARs and Fixes"},"Platform":[{"code":"PF053","label":"Power Systems"}],"Version":"730","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]
Document Information
Modified date:
12 January 2024