Setting Up Disks for HPE Ezmeral Data Fabric
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.
HPE Ezmeral Data Fabric formats and uses disks for the Lockless
Storage Services layer (file system), and records these disks
in the
disktab
file. In a production environment, or
when testing performance, HPE Ezmeral Data Fabric 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 HPE Ezmeral Data Fabric. 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 HPE Ezmeral Data Fabric 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 HPE Ezmeral Data Fabric.NOTE
It is not necessary to set up RAID
(Redundant Array of Independent Disks) on disks used by file system. HPE Ezmeral Data Fabric uses the disksetup script to set up storage pools. In most cases, you should let
HPE Ezmeral Data Fabric
calculate storage pools using the default stripe width of two or three disks. If you
anticipate a high volume of random-access I/O, you can use the -W
option with disksetup to specify larger storage
pools of up to 8 disks each.NOTICE
For more information on setting up disks, see Drive
Configuration.The following procedures are intended for use on physical clusters or Amazon EC2 instances. On
EC2 instances, EBS volumes can be used as HPE Ezmeral Data Fabric storage, although performance will be
slow.
NOTE
If you are using HPE Ezmeral Data Fabric on Amazon EMR,
you do not have to use this procedure; the disks are set up for you
automatically.