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