I LPM'ed an AIX LPAR from Frame A to Frame B. The LPAR id before the LPM was 99 and after the LPM it's still 99. And the system id has changed, as expected. Good.


Before migration.


root@lpar1 / # uname -L

99 lpar1


root@lpar1 / # lsattr -El sys0 -a systemid

systemid IBM,017268B60 Hardware system identifier False


After migration.


root@lpar1 / # uname -L

99 lpar1


root@lpar1 / # lsattr -El sys0 -a systemid

systemid IBM,0157F5B16 Hardware system identifier False


Great, that's exactly what I wanted.


Hang on a minute! What kind of sorcery is this?!


root@lpar1 / # errpt | grep sys

60AFC9E5   0405132517 I O sys0           Partition ID changed since last boot.


root@lpar1 / # errpt -aN sys0





Date/Time:       Wed Apr  5 13:25:53 EET 2017

Sequence Number: 81372

Machine Id:      000157F5B16

Node Id:         lpar1

Class:           O

Type:            INFO

WPAR:            Global

Resource Name:   sys0



Partition ID changed since last boot.


Whaddaya mean my partiton ID changed since last boot?! It hasn't! I know this for a fact! Look at the uname output above!!


Well, I'm 100% correct, the partition id HAS NOT CHANGED! But the system id has....and this is the cause of the "informational" message in the AIX error report.


AIX uses the output from 'uname -f' to detect if the system AND/OR partition id have changed since last boot.


So, in my case, the partition id (99 dec/63 hex) did not change but (as you'd expect with LPM) the system id (shown in hex below) has changed, hence the message "Partition ID changed since last boot".


Before LPM.


root@lpar1 / # uname -f



After LPM.


root@lpar1 / # uname -f



From the uname man page:


-F Displays a system identification string comprised of hexadecimal characters. This identification string is the same for all partitions on a particular system.


-f Similar to the F flag, except that the partition number is also used in the calculation of this string. The resulting identification string is unique for each partition on a particular system.


So, no problem here. Nothing to see, nothing to do. Move along!