root.sh failed during grid Infrastructure Installation.

In my case it was a permission issue with one of the disk to verify any permission issues run the following command as grid user

 $ dd if=/dev/zero of=/dev/rdsk/emcpower6e count=1440

sh /u01/app/11.2.0/grid/root.sh failed with the message ...see "/u01/app/11.2.0/grid/cfgtoollogs/crsconfig/rootcrs_node1.log" for details and inside this logfile it failed while creating ASM.

: Failed to stop ASM
: Initial cluster configuration failed. 

Executing as grid: /u01/app/11.2.0/grid/bin/asmca -silent -diskGroupName DATA -diskList /dev/

rdsk/emcpower6b,/dev/rdsk/emcpower6d,/dev/rdsk/emcpower6e -redundancy EXTERNAL -configureLocalASM

To fix this issue.. first run deconfigure and then run root.sh again.

Here are the steps to fix this.

1. On all the nodes except Last one

     Login as root and go to GRID_HOME(/u01/app/11.2.0/grid)/crs/install

     #cd /u01/app/11.2.0/grid/crs/install

     #./rootcrs.pl -deconfig -force

       Parsing the host name

       .........

       ........

       Successfully deconfigured Oracle clusterware stack on this node

2. On Last node

       #cd /u01/app/11.2.0/grid/crs/install

       #./rootcrs.pl -deconfig -force -lastnode

         Parsing the host name

         ....

         ...

         Successfully deconfigured Oracle clusterware stack on this node

In my case it was a permission issue with one of the disk. Verify any permission issues with the following command as grid user

 $ dd if=/dev/zero of=/dev/rdsk/emcpower6e count=1440

   1440 records in

   1440 records out

3. Now run root.sh again.

   #sh /u01/app/11.2.0/grid/root.sh

    Running Oracle 11g root.sh script...

  

 The following environment variables are set as:
    ORACLE_OWNER= grid
    ORACLE_HOME=  /u01/app/11.2.0/grid

    ... 

    ...

   ASM created and started successfully.

   DiskGroup DATA created successfully.

   ...

   CRS-2672: Attempting to start 'ora.DATA.dg' on 'node1'

   CRS-2676: Start of 'ora.DATA.dg' on 'node1' succeeded