ASM: Device is already labeled for ASM disk

當一塊磁碟或分割槽已經被一個DataGroup用過,此時想用這塊磁碟或分割槽重新生成Asmlib生成Oracle磁碟裝置時即會報標題的錯。

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類似如下：

/etc/init.d/oracleasm createdisk VOL1 /dev/sda1
Marking disk "/dev/sda1" as an ASM disk: asmtool:
Device "/dev/sda1" is already labeled for ASM disk "" [FAILED]

/etc/init.d/oracleasm deletedisk VOL1
Removing ASM disk "VOL1" [FAILED]

解決問題其實很簡單，把磁碟頭清一下就可以了：

dd if=/dev/zero of=<your_raw_device> bs=1024 count=100

現在操作就該正常了：

dd if=/dev/zero of=/dev/sda1 bs=1024 count=100
100+0 records in
100+0 records out

/etc/init.d/oracleasm createdisk VOL /dev/sda1
Marking disk "/dev/sda1" as an ASM disk: [ OK ]