[dmdba@dmdsc1 ~]$ id
uid=1001(dmdba) gid=1001(dinstall) groups=1001(dinstall) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

[root@dmdsc1 /]# chown -R dinstall:dmdba /dev_DSC2
chown: invalid user: ‘dinstall:dmdba’

[root@dmdsc1 /]# groupadd dinstall
groupadd: group 'dinstall' already exists

[root@dmdsc1 /]# useradd dmdba
useradd: user 'dmdba' already exists