在数据库运维中，总会遇到一些粗心大意的DBA，一不小心删除一些东西，这里举例讲解在误删除ASM磁盘之后，如果用KFED工具进行恢复：

[grid@RAC1 ~]$ sqlplus / as sysasm

SQL*Plus: Release 11.2.0.4.0 Production on Thu Jan 5 00:06:04 2017

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Real Application Clusters and Automatic Storage Management options

SQL> col path format a30

SQL> select name,path,header_status from v$asm_disk;

NAME                           PATH                           HEADER_STATU

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

DATA_0001                      /dev/mapper/mpathc             MEMBER

DATA_0004                      /dev/mapper/mpathd             MEMBER

DATA_0003                      /dev/mapper/mpathf             MEMBER

DATA_0000                      /dev/mapper/mpathb             MEMBER

DATA1_0001                     /dev/mapper/mpathh             MEMBER

DATA_0002                      /dev/mapper/mpathg             MEMBER

DATA1_0002                     /dev/mapper/mpathi             MEMBER

DATA1_0000                     /dev/mapper/mpathe             MEMBER

8 rows selected.

SQL> drop diskgroup DATA;

drop diskgroup DATA

*

ERROR at line 1:

ORA-15039: diskgroup not dropped

ORA-15053: diskgroup "DATA" contains existing files

SQL> drop diskgroup DATA including contents;

drop diskgroup DATA including contents

*

ERROR at line 1:

ORA-15039: diskgroup not dropped

ORA-15027: active use of diskgroup "DATA" precludes its dismount

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



关闭数据连接：

SQL> alter diskgroup DATA dismount force;

Diskgroup altered.

SQL> drop diskgroup DATA force including contents;

drop diskgroup DATA force including contents

*

ERROR at line 1:

ORA-15039: diskgroup not dropped

ORA-15073: diskgroup DATA is mounted by another ASM instance

dismount 需要两边都dismount 

SQL> drop diskgroup DATA force including contents;

Diskgroup dropped.

SQL> select name,path,header_status from v$asm_disk;

NAME                           PATH                           HEADER_STATU

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

                               /dev/mapper/mpathc             FORMER

                               /dev/mapper/mpathd             FORMER

                               /dev/mapper/mpathf             FORMER

                               /dev/mapper/mpathb             FORMER

                               /dev/mapper/mpathg             FORMER

DATA1_0001                     /dev/mapper/mpathh             MEMBER

DATA1_0002                     /dev/mapper/mpathi             MEMBER

DATA1_0000                     /dev/mapper/mpathe             MEMBER

8 rows selected.

[grid@RAC1 ~]$ crs_stat -t

CRS-0184: Cannot communicate with the CRS daemon.

###############################################################################################################

使用kfed进行恢复

[grid@RAC1 ~]$ kfed read /dev/mapper/mpathc > /tmp/mpathc-meta

[root@RAC1 tmp]# vi mpathc-meta 

用vi打开生成的文件，修改下面一行数据

kfdhdb.hdrsts:                        4 ; 0x027: KFDHDR_FORMER

修改为：

kfdhdb.hdrsts:                        3 ; 0x027: KFDHDR_MEMBER

[grid@RAC1 ~]$ kfed merge /dev/mapper/mpathc text=/tmp/mpathc-meta

将所有5块磁盘进行同样的操作。

SQL> select name,path,header_status from v$asm_disk;

NAME                           PATH                           HEADER_STATU

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

                               /dev/mapper/mpathc             MEMBER

                               /dev/mapper/mpathd             MEMBER

                               /dev/mapper/mpathf             MEMBER

                               /dev/mapper/mpathb             MEMBER

                               /dev/mapper/mpathg             MEMBER

DATA1_0001                     /dev/mapper/mpathh             MEMBER

DATA1_0002                     /dev/mapper/mpathi             MEMBER

DATA1_0000                     /dev/mapper/mpathe             MEMBER

SQL> alter diskgroup DATA mount;

Diskgroup altered.

两个节点都需要进行mount。

SQL> select name,path,header_status from v$asm_disk;

NAME                           PATH                           HEADER_STATU

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

DATA_0001                      /dev/mapper/mpathc             MEMBER

DATA_0004                      /dev/mapper/mpathd             MEMBER

DATA_0003                      /dev/mapper/mpathf             MEMBER

DATA_0000                      /dev/mapper/mpathb             MEMBER

DATA1_0001                     /dev/mapper/mpathh             MEMBER

DATA_0002                      /dev/mapper/mpathg             MEMBER

DATA1_0002                     /dev/mapper/mpathi             MEMBER

DATA1_0000                     /dev/mapper/mpathe             MEMBER

8 rows selected.

[grid@RAC1 ~]$ crs_stat -t
Name           Type           Target    State     Host        
------------------------------------------------------------
ora.DATA.dg    ora....up.type ONLINE    ONLINE    rac1        
ora.DATA1.dg   ora....up.type ONLINE    ONLINE    rac1        
ora....ER.lsnr ora....er.type ONLINE    ONLINE    rac1        
ora....N1.lsnr ora....er.type ONLINE    ONLINE    rac1        
ora.asm        ora.asm.type   ONLINE    ONLINE    rac1        
ora.cvu        ora.cvu.type   ONLINE    OFFLINE               
ora.gsd        ora.gsd.type   OFFLINE   OFFLINE               
ora....network ora....rk.type ONLINE    ONLINE    rac1        
ora.oc4j       ora.oc4j.type  ONLINE    OFFLINE               
ora.ons        ora.ons.type   ONLINE    ONLINE    rac1        
ora....SM1.asm application    ONLINE    ONLINE    rac1        
ora....C1.lsnr application    ONLINE    ONLINE    rac1        
ora.rac1.gsd   application    OFFLINE   OFFLINE               
ora.rac1.ons   application    ONLINE    ONLINE    rac1        
ora.rac1.vip   ora....t1.type ONLINE    ONLINE    rac1        
ora.rac2.vip   ora....t1.type ONLINE    OFFLINE               
ora....ry.acfs ora....fs.type ONLINE    ONLINE    rac1        
ora.scan1.vip  ora....ip.type ONLINE    ONLINE    rac1

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