ORACLE误删除ASM磁盘修复

　　在数据库运维中，总会遇到一些粗枝大叶的DBA，一不当心删除一些东西，这里举例讲解在误删除ASM磁盘以后，若是用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


------------------------------------------------------------------------------------------------------------------------
 关闭数据链接：

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 须要两边都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
修改成：
kfdhdb.hdrsts:                        3 ; 0x027: KFDHDR_MEMBER
[grid@RAC1 ~]$ kfed merge /dev/mapper/mpathc text=/tmp/mpathc-meta

将全部5块磁盘进行一样的操做。

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.

两个节点都须要进行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 -tName           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