Setting Up Disks for MapR
MapR formats and uses disks for the Lockless Storage Services layer (MapR-FS), and records
these disks in the file
disktab
. In a production environment, or when testing performance, MapR
should be configured to use physical hard drives and partitions. In some cases, it is
necessary to reinstall the operating system on a node so that the physical hard drives are
available for direct use by MapR. Reinstalling the operating system provides an unrestricted
opportunity to configure the hard drives. If the installation procedure assigns hard drives to
be managed by the Linux Logical
Volume Manager (LVM) by default, you should explicitly remove the drives you plan to
use with MapR from the LVM configuration. It is common to let LVM manage one physical drive
containing the operating system partition(s) and to leave the rest unmanaged by LVM for use
with MapR.NOTE: This section describes how to set up disks during the normal installation
process. Go to the
disksetup
command page for information about other uses of this
command.The following procedures are intended for use on physical clusters or Amazon EC2 instances. On
EC2 instances, EBS volumes can be used as MapR storage, although performance will be
slow.
NOTE: If you are using MapR on Amazon EMR, you do not have to use this
procedure; the disks are set up for you automatically.