Create the directory /storage and group owner should be the sysusers group.
1. chgrp sysusers /storage
2. Verify using ls -ld /storage command. You should get like
drwxr-x— 2 root sysusers 4096 Mar 16 17:59 /storage
chgrp command is used to change the group ownership of particular files or directory.
Another way you can use the chown command.
chown root:sysusers /storage