Downgrade NFS from version 4 to 3

1. Change the default client configuration to 3

$ vim /etc/nfsmount.conf 

# Protocol Version [2,3,4] 

# This defines the default protocol version which will 

# be used to start the negotiation with the server. 

Defaultvers=3 

2. change the mount file type as nfs instead of nfs4

$ vim /etc/fstab 

192.168.0.21:/nfs_meerkats      /vz     nfs     defaults,acl    1 1

192.168.0.21:/nfs_meerkats/conf /etc/vz/conf    nfs     defaults,acl    1 1

3. remount all the mount point

$ umount /vz

$ umount /etc/vz/conf

$ mount -a

$ mount

192.168.0.21:/nfs_meerkats on /vz type nfs (rw,acl,addr=192.168.0.21)

192.168.0.21:/nfs_meerkats/conf on /etc/sysconfig/vz-scripts type nfs (rw,acl,addr=192.168.0.21)

if it is using version 4:

$ mount

192.168.0.21:/nfs_meerkats on /vz type nfs (rw,acl,vers=4,addr=192.168.0.21,clientaddr=192.168.0.27)

192.168.0.21:/nfs_meerkats/conf on /etc/sysconfig/vz-scripts type nfs (rw,acl,vers=4,addr=192.168.0.21,clientaddr=192.168.0.27)