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：

  1. [grid@RAC1 ~]$ sqlplus / as sysasm
  2.  
  3. SQL*Plus: Release 11.2.0.4.0 Production on Thu Jan 5 00:06:04 2017
  4.  
  5. Copyright (c) 1982, 2013, Oracle.  All rights reserved.
  6.  
  7. Connected to:
  8. Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
  9. With the Real Application Clusters and Automatic Storage Management options
  10.  
  11. SQL> col path format a30
  12. SQL> select name,path,header_status from v$asm_disk;
  13.  
  14. NAME                           PATH                           HEADER_STATU
  15. ------------------------------ ------------------------------ ------------
  16. DATA_0001                      /dev/mapper/mpathc             MEMBER
  17. DATA_0004                      /dev/mapper/mpathd             MEMBER
  18. DATA_0003                      /dev/mapper/mpathf             MEMBER
  19. DATA_0000                      /dev/mapper/mpathb             MEMBER
  20. DATA1_0001                     /dev/mapper/mpathh             MEMBER
  21. DATA_0002                      /dev/mapper/mpathg             MEMBER
  22. DATA1_0002                     /dev/mapper/mpathi             MEMBER
  23. DATA1_0000                     /dev/mapper/mpathe             MEMBER
  24.  
  25. 8 rows selected.
  26.  
  27. SQL> drop diskgroup DATA;
  28. drop diskgroup DATA
  29. *
  30. ERROR at line 1:
  31. ORA-15039: diskgroup not dropped
  32. ORA-15053: diskgroup "DATA" contains existing files
  33.  
  34. SQL> drop diskgroup DATA including contents;
  35. drop diskgroup DATA including contents
  36. *
  37. ERROR at line 1:
  38. ORA-15039: diskgroup not dropped
  39. ORA-15027: active use of diskgroup "DATA" precludes its dismount
  40.  
  41. ------------------------------------------------------------------------------------------------------------------------

  43. 关闭数据连接：
  44.  
  45. SQL> alter diskgroup DATA dismount force;
  46.  
  47. Diskgroup altered.
  48.  
  49. SQL> drop diskgroup DATA force including contents;
  50. drop diskgroup DATA force including contents
  51. *
  52. ERROR at line 1:
  53. ORA-15039: diskgroup not dropped
  54. ORA-15073: diskgroup DATA is mounted by another ASM instance
  55. dismount 需要两边都dismount 
  56.  
  57. SQL> drop diskgroup DATA force including contents;
  58.  
  59. Diskgroup dropped.
  60.  
  61. SQL> select name,path,header_status from v$asm_disk;
  62.  
  63. NAME                           PATH                           HEADER_STATU
  64. ------------------------------ ------------------------------ ------------
  65.                                /dev/mapper/mpathc             FORMER
  66.                                /dev/mapper/mpathd             FORMER
  67.                                /dev/mapper/mpathf             FORMER
  68.                                /dev/mapper/mpathb             FORMER
  69.                                /dev/mapper/mpathg             FORMER
  70. DATA1_0001                     /dev/mapper/mpathh             MEMBER
  71. DATA1_0002                     /dev/mapper/mpathi             MEMBER
  72. DATA1_0000                     /dev/mapper/mpathe             MEMBER
  73.  
  74. 8 rows selected.
  75.  
  76. [grid@RAC1 ~]$ crs_stat -t
  77. CRS-0184: Cannot communicate with the CRS daemon.
  78.  
  79. ###############################################################################################################
  80.  
  81. 使用kfed进行恢复
  82. [grid@RAC1 ~]$ kfed read /dev/mapper/mpathc > /tmp/mpathc-meta
  83. [root@RAC1 tmp]# vi mpathc-meta 
  84. 用vi打开生成的文件，修改下面一行数据
  85. kfdhdb.hdrsts:                        4 ; 0x027: KFDHDR_FORMER
  86. 修改为：
  87. kfdhdb.hdrsts:                        3 ; 0x027: KFDHDR_MEMBER
  88. [grid@RAC1 ~]$ kfed merge /dev/mapper/mpathc text=/tmp/mpathc-meta
  89.  
  90. 将所有5块磁盘进行同样的操作。
  91.  
  92. SQL> select name,path,header_status from v$asm_disk;
  93.  
  94. NAME                           PATH                           HEADER_STATU
  95. ------------------------------ ------------------------------ ------------
  96.                                /dev/mapper/mpathc             MEMBER
  97.                                /dev/mapper/mpathd             MEMBER
  98.                                /dev/mapper/mpathf             MEMBER
  99.                                /dev/mapper/mpathb             MEMBER
  100.                                /dev/mapper/mpathg             MEMBER
  101. DATA1_0001                     /dev/mapper/mpathh             MEMBER
  102. DATA1_0002                     /dev/mapper/mpathi             MEMBER
  103. DATA1_0000                     /dev/mapper/mpathe             MEMBER
  104.  
  105. SQL> alter diskgroup DATA mount;
  106.  
  107. Diskgroup altered.
  108.  
  109. 两个节点都需要进行mount。
  110.  
  111. SQL> select name,path,header_status from v$asm_disk;
  112.  
  113. NAME                           PATH                           HEADER_STATU
  114. ------------------------------ ------------------------------ ------------
  115. DATA_0001                      /dev/mapper/mpathc             MEMBER
  116. DATA_0004                      /dev/mapper/mpathd             MEMBER
  117. DATA_0003                      /dev/mapper/mpathf             MEMBER
  118. DATA_0000                      /dev/mapper/mpathb             MEMBER
  119. DATA1_0001                     /dev/mapper/mpathh             MEMBER
  120. DATA_0002                      /dev/mapper/mpathg             MEMBER
  121. DATA1_0002                     /dev/mapper/mpathi             MEMBER
  122. DATA1_0000                     /dev/mapper/mpathe             MEMBER
  123.  
  124. 8 rows selected.
  125.  
  126. [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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