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https://issues.apache.org/jira/browse/HDFS-8851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14653205#comment-14653205
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Wang Hao commented on HDFS-8851:
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data12 is the bad disk
[hadoop@hadoop070 data12]$ ll
ls: reading directory .: Input/output error
total 0
> datanode fails to start due to a bad disk
> -----------------------------------------
>
> Key: HDFS-8851
> URL: https://issues.apache.org/jira/browse/HDFS-8851
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.5.1
> Reporter: Wang Hao
>
> Data node can not start due to a bad disk. I found a similar issue HDFS-6245
> is reported, but our situation is different.
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