I am installaling Oracle 11gR2 RAC installation. As a part of the GRID installation i failed druing the root.sh then i have restarted the installation. During the ASM disk selection the RunInstaller shows the ASM disk but i cannot able to select the disks, why?
Because it may occupied by OCR during installation.
Have you did proper deinstall process or just deleted the directory.
If you are in linux environment change ownership to grid user. Then drop and recreate the ASM disk using oracleasm.
Now start installation.
I haven't proper deinstall process, I just deleted the directory.
Using linux environment only and how to change ownership to grid user ?
Then how to drop and recreate the ASM disk using oracleasm.
Please provide me the steps.
Hi Nikil Metha
When you re-install, OUI do not detect ASM disks as candidate since they were used preivously
---> Why OUI cannot detect the previosuly used ASM disks?
What is the OS you are using?? Version??
----> CentOS 6.3 in VMWare
Are you using ASMLib??
CENTOS is completly unsupported by ORACLE. Also, ORACLE wont support VMWARE. I will verify this only if its my produciton system. Although, if you want you can install 11gR2 on CENTOS. It wont give you much trouble as my experince says. But ORACLE wont support any of your queires. Please see metalink id 1304727.1 for complete certificaiton information.
Why OUI cannot detect the previosuly used ASM disks?
Since you are not using ASMLib, you need to rely on OS for your devices to be visible to ASM as candidate disk. When you re-install grid infrastrucuture, the header of the partitions are marked as used. So in OUI, you can see the disk but they are not seen as Candidate disk.
To make them visible again, you need to Overwrite the header for the relevant partitions using the "dd" command.
For eg, on RHEL 6.2 we used below commands. You can check for CENTOS.
# dd if=/dev/zero of=/dev/sdb1 bs=1024 count=100
Remove and create the ASM disk for each partition.
# /etc/init.d/oracleasm deletedisk DATA /dev/sdb1
# /etc/init.d/oracleasm createdisk DATA /dev/sdb1
You can also refer below link.
AFAIK, Oracle doesn't support Centos officially.
Unofficially - yes, IF you can recreate the problem.
RH 6 and OLinux 6 are supported.
BTW, ASMlib RPM's is not provided for RH 6 (Centos 6 as weell) anymore, so you will have to use UDEV (which is quite nice).
If you want it, use Oracle Linux 6 instead (it's there).
Another thing, even when you use OLinux 6 and need multipathing (cluster solution), then again you will have to use UDEV.
Does it help?
Edited by: g777 on 2013-02-21 13:02
here you are
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