在10g的时候 如果要将数据文件从os 迁移到asm 或者反之，必须使用rman或者dbms_file_transfer实现。在oracle 11g的asmcmd提供了cp命令来实现asm 磁盘组和os 之间，asm 磁盘之间的数据文件的迁移。

共如下三种方式： 1 .ASM Diskgroup to OS file system 2..OS file system to ASM Diskgroup 3 .ASM Diskgroup to another diskgroup

-- ASM Diskgroup to OS File system ASMCMD [+data] > cp +DATA/rac/datafile/users.950.732883617  /tmp/user.dbf copying +DATA/rac/datafile/users.950.732883617 -> /tmp/user.dbf--OS File system to ASM Diskgroup

ASMCMD [+data] > cp /tmp/user.dbf +DATA/rac/datafile/users.950.732883617 

copying /tmp/user.dbf ->  +DATA/rac/datafile/users.950.732883617

--ASM Diskgroup to another diskgroup

SQL> create diskgroup dgext external redundancy disk '/dev/raw/raw1','/dev/raw/raw2'; Diskgroup created.

SQL> create diskgroup DGEXTBK external redundancy disk '/dev/raw/raw3','/dev/raw /raw4';

Diskgroup created.

ASMCMD> cd DGEXTBK

ASMCMD> mkdir prod ASMCMD> cd prod ASMCMD> mkdir datafile ASMCMD> cd datafile ASMCMD> pwd +DGEXTBK/prod/datafile

SQL> create tablespace TBSEXT datafile '+DGEXT' size 10m;

Tablespace created. SQL> select name from v$datafile; NAME ------------------------------------------------------------- +DGEXT/orcl/datafile/tbsext.256.628847401

ASMCMD> cp +DGEXT/orcl/datafile/tbsext.256.628847401 +DGEXTBK/prod/datafile/tbsext

+DGEXT/orcl/datafile/tbsext.256.628847401  -> +DGEXTBK/prod/datafile/tbsext  

foldertbsext是建立在+DGEXTBK/prod/datafile文件夹下数据文件的别名，真正的文件建立在文件夹ASMTESTING下

ASMCMD> ls -ltr 

Type Redund Striped Time Sys Name  N tbsext => +DGEXTBK/ASMTESTING/DATAFILE/TESTING.256.628848885

参考 metalink [ID 451900.1]