0 Replies Latest reply: Oct 12, 2013 6:05 AM by Catch~22 RSS

    Notes About Installing Oracle ASMlib

    Catch~22

      Revised 12-Oct-2013

       

      I thought the following could be useful to for newcomers:

       

      Downloading and Information:

       

      To download the latest version of oracleasmlib and other useful information:

       

      http://www.oracle.com/technetwork/topics/linux/asmlib/index-101839.html

      https://blogs.oracle.com/wim/entry/asmlib

      Oracle ASMLib Release Notes

       

      For users of RHEL 6, oracleasmlib is available from RHN, which requires a Red Hat subscription:

      Oracle ASMLib Downloads for Red Hat Enterprise Linux Server 6

       


      Installation:

       

      The Oracle UEK kernel ships with the oracleasm kernel driver module, but still requires to install the oracleasmlib and oracleasm-support packages. Make sure to download and install the latest oracleasmlib version. For instance:

       

      su - root
      wget http://download.oracle.com/otn_software/asmlib/oracleasmlib-2.0.4-1.el6.x86_64.rpm
      yum -y install oracleasmlib-2.0.4-1.el6.x86_64.rpm
      rm -rf oracleasmlib-2.0.4-1.el6.x86_64.rpm
      yum -y install oracleasm-support

       

       

      SELinux (Security Enhanced Linux) will need to be disabled or set to permissive to avoid errors. It can be configured by editing /etc/selinux/config. For example:


      su - root
      cp /etc/selinux/config /etc/selinux/config.orig
      sed -i 's:^SELINUX=enforcing:SELINUX=disabled:g' /etc/selinux/config
      shutdown -r now

       


      The concept of raw devices, which are storage devices that do not have a file system, was used under RHEL 4, but has been depreciated since the release of RHEL 5. ASM uses the O_DIRECT flag to access devices in order to bypass kernel device caching. ASM can use empty and partitioned devices. Partitioned devices are generally easier to be recognized to contain data than devices that appear unused. For example:


      su - root
      parted -s /dev/sdb mklabel msdos mkpart primary 1 -- -1
      /etc/init.d/oracleasm createdisk ASMVOL1 /dev/sdb1

       

       

       

      Troubleshooting:


      Error MessageSolution

      Initializing the Oracle ASMLib driver: [FAILED]

      This error may occur after executing (as root):
      /etc/init.d/oracleasm configure

       

      To avoid the error, restart the system after installing Oracle ASMLib or type:
      modprobe oracleasm

      Oracle Grid (ASM) GUI installer (runInstaller) does not detect storage devices

      Verify the oracleasmlib package has been installed and devices are available:


      su - root
      yum list oracleasmlib
      /usr/sbin/oracleasm-discover

      Using ASMLib from /opt/oracle/extapi/64/asm/orcl/1/libasm.so

      asm_version() failed with code 2

      Verify SELinux is set to permissive or disabled.
      Marking disk "xyz" as an ASM disk:  [FAILED]Verify SELinux is set to permissive or disabled.


       

      Good luck!