11gr2 RAC install on RHEL fails with "failed to create or upgrade olr"

Question

New 11gr2 install on empty Red Hat Enterprise Linux 5.4 machine fails with "failed to create or upgrade olr"
Error during config steps. First script ran OK (orainstRoot.sh) on both nodes.
Second script failed on DB01, and I haven't run on DB02, as it's supposed to complete on DB01 first.
[root@RiskmgmtDB01 oraInventory]# cd /u01/app/11.2.0/grid
[root@RiskmgmtDB01 grid]# ./root.sh
Running Oracle 11g root.sh script...
The following environment variables are set as:
ORACLE_OWNER= oracle
ORACLE_HOME= /u01/app/11.2.0/grid
Enter the full pathname of the local bin directory: [usr/local/bin]:
Copying dbhome to /usr/local/bin ...
Copying oraenv to /usr/local/bin ...
Copying coraenv to /usr/local/bin ...
Creating /etc/oratab file...
Entries will be added to the /etc/oratab file as needed by
Database Configuration Assistant when a database is created
Finished running generic part of root.sh script.
Now product-specific root actions will be performed.
2010-11-12 10:35:13: Parsing the host name
2010-11-12 10:35:13: Checking for super user privileges
2010-11-12 10:35:13: User has super user privileges
Using configuration parameter file: /u01/app/11.2.0/grid/crs/install/crsconfig_params
Creating trace directory
PROTL-16: Internal Error
Command return code of 41 (10496) from command: /u01/app/11.2.0/grid/bin/ocrconfig -local -upgrade oracle oinstall
Failed to create or upgrade OLR
[root@RiskmgmtDB01 grid]#
Looking on the net, anyone who has hit this has had a problem with permissions, so as suggested I ran:
[root@RiskmgmtDB01 grid]# /usr/sbin/getenforce
Disabled
[root@RiskmgmtDB01 grid]# /usr/sbin/setenforce 0
/usr/sbin/setenforce: SELinux is disabled
[root@RiskmgmtDB01 grid]# /usr/sbin/getenforce
Disabled
As this is already set to disabled, I don't think it will help.
The two other threads similar to this are:
root.sh failed with signal 11 while installing 11gR2 grid infrastructure
root.sh script fail to run on OEL5.4
But neither works. I've raised a support request, but if anyone else has a bright idea ....
Thanks, Duncan

Answer 1

This document seems to apply: PROTL-16 Reported while Executing OCRCONFIG [ID 1123453.1]
It recommends running CVU, but that showed no issues.
So next step is the uninstall, as per: How to Proceed from Failed 11gR2 Grid Infrastructure (CRS) Installation [ID 942166.1]
However "$GRID_HOME/crs/install/rootcrs.pl -verbose -deconfig -force -lastnode" fails:
# /u01/app/11.2.0/grid/crs/install/rootcrs.pl -verbose -deconfig -force -lastnode
2010-11-15 17:11:21: Parsing the host name
2010-11-15 17:11:21: Checking for super user privileges
2010-11-15 17:11:21: User has super user privileges
Using configuration parameter file: /u01/app/11.2.0/grid/crs/install/crsconfig_params
Can't open /etc/oracle/scls_scr/node01/root/ohasdrun for write: No such file or directory at /u01/app/11.2.0/grid/crs/install/s_crsconfig_lib.pm line 1021.
So no further along yet ...