抛砖引玉：
参考：
create diskgroup data2 high redundancy
2 failgroup fg1 disk '/dev/raw/raw5' name d2a
3 failgroup fg2 disk '/dev/raw/raw6' name d2b
4 failgroup fg3 disk '/dev/raw/raw7' name d2c
5 failgroup fg4 disk '/dev/raw/raw8' name d2d;
Diskgroup created.
?EXTERNAL REDUNDANCY indicates that Automatic Storage Management does not provide any redundancy for the disk group. The disks within the disk group must provide redundancy (for example, using a storage array), or you must be willing to tolerate loss of the disk group if a disk fails (for example, in a test environment). You cannot specify the FAILGROUP clause if you specify EXTERNAL REDUNDANCY.
注意到最后一句，看来通过现成的命令是无法完成了
