oracle asm 磁盘组mount不成功总结

oracle asm磁盘组mount不成功,以我自己遇到的问题
可以总结为以下几个方面：

1.磁盘组某个磁盘的磁盘头信息丢失
ERROR at line 1:ORA-15032: not all alterations performedORA-15040: diskgroup is incompleteORA-15042: ASM disk “1” is missing 2.磁盘组内file directory盘信息丢失
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15063: ASM discovered an insufficient number of disks for diskgroup “DATA”;

3.磁盘组内某个磁盘的权限不对
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15040: diskgroup is incomplete
ORA-15042: ASM disk “1” is missing
如果还有其他原因，请大家列出。