Managing Disks

You can add and remove disks in the MapR Filesystem from the MapR Control System or using the diskadd and diskremove commands. MapR Filesystem groups disks into storage pools, usually made up of two or three disks. When adding disks to MapR Filesystem, it is a good idea to add at least two or three at a time so that MapR can create properly-sized storage pools. Each node in a MapR cluster can support up to 36 storage pools.

To see which disks are used by MapR Filesystem, check the disktab file that MapR maintains on each node.

Warning: For instructions on performing disk maintenance on a node, see Performing Maintenance on a Node. If a disk failure alarm is raised (NODE_ALARM_DISK_FAILURE), see Handling Disk Failures for instructions.

Refer to the following procedures to manage disks using the MapR Control System and the CLI.