数据库实例日志： 

十年的沾化网站建设经验，针对设计、前端、开发、售后、文案、推广等六对一服务，响应快，48小时及时工作处理。网络营销推广的优势是能够根据用户设备显示端的尺寸不同，自动调整沾化建站的显示方式，使网站能够适用不同显示终端，在浏览器中调整网站的宽度，无论在任何一种浏览器上浏览网站，都能展现优雅布局与设计，从而大程度地提升浏览体验。创新互联从事“沾化网站设计”,“沾化网站推广”以来，每个客户项目都认真落实执行。

Tue Mar 01 12:18:12 2016

SUCCESS: diskgroup ORADISKGRP1 was dismounted

SUCCESS: diskgroup ORADISKGRP1 was dismounted

Errors in file C:\APP\ORACLE\PRODUCT\11.2.0\diag\rdbms\bflex\bflex1\trace\bflex1_ckpt_6376.trc:

ORA-00206: error in writing (block 3, # blocks 1) of control file

ORA-00202: control file: '+ORADISKGRP1/bflex/controlfile/current.287.925642037'

ORA-15078: ASM diskgroup was forcibly dismounted

ORA-15078: ASM diskgroup was forcibly dismounted

再看asm日志

Tue Mar 01 12:18:12 2016

ASM Health Checker found 1 new failures

Dirty Detach Reconfiguration complete

Tue Nov 01 12:18:12 2016

WARNING: dirty detached from domain 1

NOTE: cache dismounted group 1/0x5DD073B7 (ORADISKGRP1)

SQL> alter diskgroup ORADISKGRP1 dismount force /* ASM SERVER:1573942199 */

Tue Nov 01 12:18:12 2016

NOTE: cache deleting context for group ORADISKGRP1 1/0x5dd073b7

GMON dismounting group 1 at 6 for pid 30, osid 7684

NOTE: Disk ORADISKGRP1_0000 in mode 0x7f marked for de-assignment

NOTE: Disk ORADISKGRP1_0001 in mode 0x7f marked for de-assignment

NOTE: Disk ORADISKGRP1_0002 in mode 0x7f marked for de-assignment

SUCCESS: diskgroup ORADISKGRP1 was dismounted

SUCCESS: alter diskgroup ORADISKGRP1 dismount force /* ASM SERVER:1573942199 */

SUCCESS: ASM-initiated MANDATORY DISMOUNT of group ORADISKGRP1

这里的asm日志很明显由于asm disk无法正常访问,报ORA-27072错误,磁盘组被强制dismount. 一般出现这样故障的原因大多都是人为误操作造成的，比如挂到A机的裸盘被挂至B机，然后被误格式化。

处理办法：

先用kfed恢复磁盘头

使用asmtool  -list查看相关磁盘信息

然后用dbv检测是否有坏块，没有就好办了。幸好asm有备份，用备份恢复即可。

网站栏目：oracleasmdisk被格式化为ntfs文件系统
新闻来源：http://njwzjz.com/article/jdoddj.html