AIX vg creation problem in shell script

Question

Creating a volume group using mkvg -y trialvg xyz works but
the same line represented like this mkvg -y $vg_name $dev_name in a shell script
causes the following problem :

bash-4.0# ./execute_AIX.sh
Creating VG trialvg with device xyz
Executing Command: mkvg -y trialvg xyz
0519-100 libodm: Cannot open the object class collection file. Check path name and permissions. 0516-307 mkvg: Unable to access Device Configuration Database. Creating VG: Failed

Answer 1

Somebody must have set the maxdata environment variable. That causes this error. This has something to do with the max # of shared memory segment that a process can attach to (shmat problem).

So do export LDR_CNTRL=MAXDATA=0x80000000@DSA and try again. It should work.

Answer 2

In maxdata=0x80000000 setting, only segment b and c will be available for shmat (after 8 segments are allocated for user heap) and one more shmat request will fail as segment e is already attached.

Answer 3

You may want to use set -x in the script to see what commands get executed.

Answer 4

Your clue is in a portion of the error message: "Check path name and permissions."

There is something different between the environment of your script and your interactive environment. Two likely candidates are a missing shebang (or one that specifies a different shell) or a PATH that differs. Without seeing the script it's difficult to guess.

Answer 5

Please check you ODMDIR environment variable (env |grep ODMDIR). This should point to "/etc/objrepos".