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From "Joseph Naegele" <jnaeg...@grierforensics.com>
Subject change HDFS disks on each node
Date Fri, 04 Mar 2016 21:04:50 GMT
Hi all,

Each of our N datanodes has attached two 3TB disks. I want to attach new
*replacement* storage to each node, move the HDFS contents to the new
storage, and remove the old volumes. We're using Hadoop 2.7.1.

1. What is the simplest, correct way to do this? Does hot-swapping move data
from old disks to new disks? I am able to stop the cluster completely.

2. Is it reasonable to use LVM to create expandable logical volumes? We're
using AWS and contemplating switching from SSDs to magnetic storage, which
is limited to 1TB volumes.


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