执行删除asm磁盘时报错！
[root@rac1 grid]# /etc/init.d/oracleasm deletedisk DATA01 /dev/sdc1
Marking disk “DATA02” as an ASM disk: [FAILED]
查看日志： cat /var/log/oracleasm
Device “/dev/sdc1” is already labeled for ASM disk “”
说明asm硬盘标签存在，但其值是空。
处理：
[root@rac1 grid]# oracleasm renamedisk -f /dev/sdc1 DATA01
Writing disk header: done
Instantiating disk “DATA01”: done
[root@rac1 grid]# /etc/init.d/oracleasm scandisks
Scanning the system for Oracle ASMLib disks: [ OK ]
[root@rac1 grid]# /etc/init.d/oracleasm listdisks
DATA01
OCR_VOTE
[root@rac1 grid]# /etc/init.d/oracleasm deletedisk DATA01 /dev/sdc1
Removing ASM disk “DATA01”: [ OK ]
