我在Windows上用iscsi做了个ASM实例，试了一下，好像是不行。
redundancy不能改了，报了个错误。
ORA-15067: command or option incompatible with diskgroup redundancy
文档是这么说的：
ORA-15067: command or option incompatible with diskgroup redundancy
Cause: An attempt was made to use a feature which is not permitted by the diskgroup"s redundancy policy. Common examples are forcibly dropping a disk from an EXTERNAL REDUNDANCY diskgroup, using the FAILGROUP clauses with an EXTERNAL REDUNDANCY diskgroup, or using invalid template attributes.
