Skip to main content
pardeep_kumar
pardeep_kumar
Gold ⭐️
November 10, 2015

Replacing Disks on Datanode Hosts

  • October 5, 2026 at 9:42 AM
  • 2 replies
  • 8931 views
  • Translate All

Below are steps to replace disk in slave nodes or to perform maintenance of slave nodes servers.

1. Decommission the Datanode and all services running on it (i.e. NodeManager, HBase RegionServer, Datanode etc). Refer below docs for the same.

https://docs.hortonworks.com/HDPDocuments/Ambari-2.4.1.0/bk_ambari-user-guide/content/decommissioning_masters_and_slaves.html

https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.5.0/bk_administration/content/ch_slave_nodes.html

2. Replace the disks or perform any other tasks for server maintenance.

3. Recommission the node.

4. Start all services components on the node.

5. Run Fsck utility for HDFS to ensure that HDFS is in healthy state. FSCK reports usually show a few over replicated blocks after a datanode is recommissioned which would automatically be fixed over time.

    2 replies

    xyao
    Gold ⭐️
    xyao
    Gold ⭐️
    November 13, 2015

    You can do hotswap introduced by HDFS-1362 to replace slave nodes disks without Decommission/Recommission(Restart).

    Ambari may not support this now. But you can always do that with hdfs command line.

    More details can be found from this link.

    Translate
      hosako
      hosako
      Gold ⭐️
      January 14, 2016

      If I don't mind some down time, can I skip decommission / recommission process?

      I have 12 DataNode locations and 12 disks. I would like to replace only one disk. I can schedule maintenance window.

      Translate
      Terms & ConditionsAccessibility statement