RAC Instalation Problem (shared accross all the nodes in the cluster)

All experts
I am trying for installing Oracle 10.2.0 RAC on Redhat 4.7
reff : http://www.oracle-base.com/articles/10g/OracleDB10gR2RACInstallationOnLinux
All steps successfully completed on all nodes (rac1,rac2) every thing is okey for each node
on single node rac instalation successfull.
when i try to install on two nodes
on specify Oracle Cluster Registry (OCR) location showing error
the location /nfsmounta/crs.configuration is not shared accross all the nodes in the cluster. Specify a shared raw partation or cluster file system file that is visible by the same name on all nodes of the cluster.
I create shared disks on all nodes as:
1 First we need to set up some NFS shares. Create shared disks on NAS or a third server if you have one available. Otherwise create the following directories on the RAC1 node.
mkdir /nfssharea
mkdir /nfsshareb
2. Add the following lines to the /etc/exports file. (edit /etc/exports)
/nfssharea *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
/nfsshareb *(rw,sync,no_wdelay,insecure_locks,no_root_squash)
3. Run the following command to export the NFS shares.
chkconfig nfs on
service nfs restart
4. On both RAC1 and RAC2 create some mount points to mount the NFS shares to.
mkdir /nfsmounta
mkdir /nfsmountb
5. Add the following lines to the "/etc/fstab" file. The mount options are suggestions from Kevin Closson.
nas:/nfssharea /nfsmounta nfs rw,bg,hard,nointr,tcp,vers=3,timeo=300,rsize=32768,wsize=32768,actimeo=0 0 0
nas:/nfsshareb /nfsmountb nfs rw,bg,hard,nointr,tcp,vers=3,timeo=300,rsize=32768,wsize=32768,actimeo=0 0 0
6. Mount the NFS shares on both servers.
mount /mount1
mount /mount2
7. Create the shared CRS Configuration and Voting Disk files.
touch /nfsmounta/crs.configuration
touch /nfsmountb/voting.disk
Please guide me what is wrong

I think you did not really mount it on the second server. what is the output of 'ls /nfsmounta'.
step 6 should be 'mount /nfsmounta', not 'mount 1'. I also don't know if simply creating a zero-size file is sufficient for ocr (i have always used raw devices, not nfs for this)

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