idle> startup
ASM instance started
Total System Global Area 83886080 bytes
Fixed Size 1217836 bytes
Variable Size 57502420 bytes
ASM Cache 25165824 bytes
ORA-15032: not all alterations performed
ORA-15063: ASM discovered an insufficient number of disks for diskgroup "DATA"
idle> select group_number,name,state,total_mb,free_mb from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB FREE_MB
------------ ---------- --------------------------------- ---------- ----------
0 DATA DISMOUNTED 0 0
2 WATER MOUNTED 2744 599
idle> alter diskgroup data mount;
alter diskgroup data mount
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15063: ASM discovered an insufficient number of disks for diskgroup "DATA"
idle> drop diskgroup data;
drop diskgroup data
*
ERROR at line 1:
ORA-15039: diskgroup not dropped
ORA-15001: diskgroup "DATA" does not exist or is not mounted
idle> drop diskgroup data including contents;
drop diskgroup data including contents
*
ERROR at line 1:
ORA-15039: diskgroup not dropped
ORA-15001: diskgroup "DATA" does not exist or is not mounted
查询错误信息：
[oracle@localhost ~]$ oerr ora 15063
15063, 00000, "ASM discovered an insufficient number of disks for diskgroup \"%s\""
// *Cause: ASM was unable to find a sufficient number of disks belonging to the
// diskgroup to continue the operation.
// *Action: Check that the disks in the diskgroup are present and functioning,
// that the owner of the ORACLE binary has read/write permission to
// the disks, and that the ASM_DISKSTRING initialization parameter
// has been set correctly. Verify that ASM discovers the appropriate
// disks by querying V$ASM_DISK from the ASM instance.
处理步骤：
① /etc/init.d/init.cssd stop
② /etc/init.d/init.cssd start
③ sleep 90
④ restart ASM instance and shutdown immediate
⑤ again restart ASM instance
idle> startup
ASM instance started
Total System Global Area 83886080 bytes
Fixed Size 1217836 bytes
Variable Size 57502420 bytes
ASM Cache 25165824 bytes
ASM diskgroups mounted
现在没抛出错误了，不过：
SQL> drop diskgroup data;
drop diskgroup data
*
ERROR at line 1:
ORA-15039: diskgroup not dropped
ORA-15001: diskgroup "DATA" does not exist or is not mounted
由于10g中还没有drop diskgroup force的语法，所以这里我们借助linux的dd和dbca配合来强制删除这个老顽固。
步骤：
㈠ 通过查询可知raw5挂在了data身上：
[root@localhost ~]# dd if=/dev/zero of=/dev/raw/raw5 bs=1024 count=5
5+0 records in
5+0 records out
5120 bytes (5.1 kB) copied, 0.011998 seconds, 427 kB/s
㈡ 在dbca ---> show all ---> 选中raw5 ---> 点击cancel
其实，我已经有water这个diskgroup，也mount上了，对于data这个diskgroup，可以不必管它。