samba+ldap configuration

After working with linux file server+windows 2003 AD , last week we switched to samba+ldap configuration. Users, computers and group account now get stored in openldap database. My ideal setup that is functioning properly from last one week without any issues is as follows .

[global]
      workgroup = abc
server string = abcdel1
netbios name = abcdel1
      guest account = vishesh
      ldap passwd sync = yes
      security = user
passdb backend = ldapsam:ldap://127.0.0.1
ldap suffix = dc=abc,dc=del
ldap machine suffix = ou=Computers
ldap user suffix = ou=People
ldap group suffix = ou=Group
ldap admin dn= "uid=root,ou=People,dc=abc,dc=del"
      domain master = yes
domain logons = yes
      logon path =     
add user script = /usr/sbin/smbldap-useradd "%u"
add group script = /usr/sbin/smbldap-groupadd "%g"
add machine script = /usr/sbin/smbldap-useradd -w "%u"
delete user script = /usr/sbin/smbldap-userdel "%u"
delete group script = /usr/sbin/smbldap-groupdel "%g"
      local master =  yes
os level =  254
preferred master = yes
      wins support = yes

[netlogon]
comment = Network Logon Service
path = /var/lib/samba/netlogon
guest ok = yes
writable = no
share modes = no