求证了一下，是可以加的，不报错，但没有意义，裸设备还在

[root@sfrac02 ~]# vxassist -g oradg make lv_oradata_test 20M
[root@sfrac02 ~]# vxedit -g oradg set user=oracle group=dba mode=644 lv_oradata_test
[root@sfrac02 ~]# 
[root@sfrac02 ~]# 
[root@sfrac02 ~]# ls -l /dev/vx/rdsk/oradg/
total 0
crw-r--r--  1 oracle dba      199, 9 Jun  9 17:26 lv_oradata_test
crw-rw----  1 oracle oinstall 199, 7 Jun  7 17:44 oradata

SQL> create tablespace test1 datafile '/dev/vx/rdsk/oradg/lv_oradata_test' size 18M  ;

Tablespace created.

SQL> 
SQL> drop tablespace test1 including contents and datafiles ;

Tablespace dropped.

SQL> 
SQL> !ls -l /dev/vx/rdsk/oradg/
total 0
crw-r--r--  1 oracle dba      199, 9 Jun  9 17:23 lv_oradata_test
crw-rw----  1 oracle oinstall 199, 7 Jun  7 17:42 oradata

[root@sfrac02 ~]# vxassist -g oradg remove volume lv_oradata_test
[root@sfrac02 ~]#