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まず、asmlibを使うことを勧めない。具体的な原因はWhy ASMLIB and why not?に参考してください。   けどasmlibを使った場合に、ユーザーがoracleasm deletediskの誤操作でASM Diskの asmlibマックを削除したら、以下の方法でリカバリできる：
  1. backup database using RMAN
  2. dismount the active Disk group 3. Create KFED following ‘unpublished’ Note 284646.1 Creating and using the kfed utility to view ASM disk header 4. Follow same note to perform kfed read on the affected disk headers. 5. Examine the output to verify that the header appears similar to the following:
kfbh.endian: 1 ; 0x000: 0x01 kfbh.hard: 130 ; 0x001: 0x82 kfbh.type: 1 ; 0x002: KFBTYP_DISKHEAD kfbh.datfmt: 1 ; 0x003: 0x01 kfbh.block.blk: 0 ; 0x004: T=0 NUMB=0x0 kfbh.block.obj: 2147483648 ; 0x008: TYPE=0x8 NUMB=0x0 kfbh.check: 3808867501 ; 0x00c: 0xe306b4ad kfbh.fcn.base: 1463 ; 0x010: 0x000005b7 kfbh.fcn.wrap: 0 ; 0x014: 0x00000000 kfbh.spare1: 0 ; 0x018: 0x00000000 kfbh.spare2: 0 ; 0x01c: 0x00000000 kfdhdb.driver.provstr: ORCLCLRD ; 0x000: length=8 kfdhdb.driver.reserved[0]: 0 ; 0x008: 0x00000000 kfdhdb.driver.reserved[1]: 0 ; 0x00c: 0x00000000 kfdhdb.driver.reserved[2]: 0 ; 0x010: 0x00000000 kfdhdb.driver.reserved[3]: 0 ; 0x014: 0x00000000 The value ORCLCLRD is set after using /etc/init.d/oracleasm deletedisk 6. Assuming that kfbh.type = KFBTYP_DISKHEAD and that kfdhdb.driver.provstr: = ORCLCLRD for each disk this operation will be successful. 7. kfed read <device name> > fix.txt 8. Edit fix.txt to change only ORCLCLRD to ORCLDISK 9. kfed merge <device name> text=fix.txt 10. etc/init.d/oracleasm listdisk 11. etc/init.d/oracleasm force-renamedisk This command requires 2 arguments the first is the full path to the disk the second is the LABEL that will be stamped on the disk.