Adding Disks to MapR Filesystem

You can add disks to MapR Filesystem using MCS and the CLI. Before adding the disks to MapR Filesystem, add the physical disks to the node or nodes according to the correct hardware procedure.

  • If you are removing and replacing failed disks, you must install the replacements, then re-add the replacement disks to MapR Filesystem, along with the other disks that were in the same storage pool(s) as the failed disks. See Handling Disk Failures for more details.
  • If you are removing disks but not replacing them, you can just re-add the other disks that were in the same storage pool(s) as the failed disks.
Note: Disks must be added on CLDB nodes one node at a time when Warden and MapR services are running.

Adding Disks Using the MapR Control System

Complete the following steps to add disks of type MapR Filesystem using the MapR Control System:

  1. Log in to MCS and go to the Summary tab in the node information page.
  2. Select the disks not yet added to MapR Filesystem in the Disks pane and click Add Disk(s) to MapR-FS.
    The Add Disk(s) to MapR-FS confirmation dialog displays.
    Note: You cannot select disks of type System to add.
  3. Review the list and click Add Disk.
    The disks are automatically formatted and properly-sized storage pools are automatically allocated.

Adding Disks Using the CLI or REST API

The basic command to add disks to a node is:

maprcli disk add -disks <disk names> -host <host>
Note: This step reformats the disks. Any data on these disks will be lost.

For complete reference information, see disk add.