Notification
Risk classification
HIPER (High Impact and/or Pervasive)
Risk categories
Data Loss
Abstract
IJ46487 - potential undetected data loss after running chvg -ky or chvg -g
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>' shows:
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.
Recommended Action
Avoid the above 'chvg' commands until the following fix has been applied.
Affected AIX Levels and Recommended Fixes
| Minimum Affected Level | Maximum Affected Level | Fixing Level | Ifix |
|---|---|---|---|
|
7300-01-00
bos.rte.lvm 7.3.1.0
|
7300-01-02-2320
bos.rte.lvm 7.3.1.2
|
7300-01-03
|
iFix |
|
7300-00-00
bos.rte.lvm 7.3.0.0
|
7300-00-03-2246
bos.rte.lvm 7.3.0.2
|
7300-00-04
|
iFix |
|
7200-05-00
bos.rte.lvm 7.2.5.0
|
7200-05-06-2320
bos.rte.lvm 7.2.5.201
|
7200-05-07
|
iFix |
This table describes which active levels are affected and where to obtain fixes.
Before the APAR fix is available, an interim fix (iFix) is available for each affected level.
The available interim fixes might apply only to the latest Service Packs. If a custom interim fix is required, contact IBM Support.
The interim fixes can be downloaded from the same location by using HTTPS or FTPS.
Before the APAR fix is available, an interim fix (iFix) is available for each affected level.
The available interim fixes might apply only to the latest Service Packs. If a custom interim fix is required, contact IBM Support.
The interim fixes can be downloaded from the same location by using HTTPS or FTPS.
Date first published
24 April 2023
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Document Information
Modified date:
24 April 2023
UID
ibm16985585