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https://issues.apache.org/jira/browse/HDFS-2832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13751195#comment-13751195
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Junping Du commented on HDFS-2832:
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Thanks for quickly reply. [~arpitagarwal].
bq. We have not considered this use case. Are you running multiple DataNodes
over the same NAS for redundancy?
I have two use cases in my mind:
1. As one kind of DR solution, user can choose to put 1 or 2 replica on a
remote reliable storage (i.e. NAS backed with SAN). Multiple DNs connect to NAS
will have more bandwidth.
2. In virtualization case, some virtual machines are backed with cluster FS
(i.e. VMFS) on shared storage rather than local disks (it may not be the most
cost-effective way but not corner case in enterprise environment). Some DNs on
VMs could be backed with same shared storage.
bq. Please feel free to file a Jira with your feature idea and motivation and
we can discuss how to proceed after we have initial level of support for
Heterogeneous Storages. Sound good?
Yes. That make sense. Will file JIRA later.
> Enable support for heterogeneous storages in HDFS
> -------------------------------------------------
>
> Key: HDFS-2832
> URL: https://issues.apache.org/jira/browse/HDFS-2832
> Project: Hadoop HDFS
> Issue Type: New Feature
> Affects Versions: 0.24.0
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Attachments: 20130813-HeterogeneousStorage.pdf
>
>
> HDFS currently supports configuration where storages are a list of
> directories. Typically each of these directories correspond to a volume with
> its own file system. All these directories are homogeneous and therefore
> identified as a single storage at the namenode. I propose, change to the
> current model where Datanode * is a * storage, to Datanode * is a collection
> * of strorages.
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