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https://issues.apache.org/jira/browse/HDFS-12818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290244#comment-16290244
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Konstantin Shvachko commented on HDFS-12818:
--------------------------------------------

I was wondering if by default when {{simulatedCapacities != null}} we can set 
{{storagesPerDatanode(1)}}. Then you wont need to change all these tests?

> Support multiple storages in DataNodeCluster / SimulatedFSDataset
> -----------------------------------------------------------------
>
>                 Key: HDFS-12818
>                 URL: https://issues.apache.org/jira/browse/HDFS-12818
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, test
>            Reporter: Erik Krogen
>            Assignee: Erik Krogen
>            Priority: Minor
>         Attachments: HDFS-12818.000.patch, HDFS-12818.001.patch, 
> HDFS-12818.002.patch, HDFS-12818.003.patch, HDFS-12818.004.patch, 
> HDFS-12818.005.patch, HDFS-12818.006.patch, HDFS-12818.007.patch
>
>
> Currently {{SimulatedFSDataset}} (and thus, {{DataNodeCluster}} with 
> {{-simulated}}) only supports a single storage per {{DataNode}}. Given that 
> the number of storages can have important implications on the performance of 
> block report processing, it would be useful for these classes to support a 
> multiple storage configuration.



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