补充：

若上一步出现错误：报DG1在node2没有被mount

手工方式对磁盘mount：

进入到node2系统

[root@node2 ~]#su - grid     //因为asm是由grid用户管理的

[grid@node2 ~]$ sqlplus '/as  sysdba'

SQL>show parameter name

SQL>desc v$asm_diskgroup

sql>selectgroup_number,name,state from v$asm_diskgroup;

GROUP_NUMBER NAME                           STATE

------------------------------------------ -----------

           1 OCR_VOTEGD                     MOUNTED

           2 RCYG                                    MOUNTED

           0 DG1                                     DISMOUNTED

sql>conn  /as sysasm     //mount需要用sysasm用户

sql>alterdiskgroup dg1 mount;