User guide

Technical white paper | HP Enterprise Virtual Array Storage and VMware vSphere 4.x and 5.x configuration best practices
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Term
Description
EVA
The HP Enterprise Virtual Array (EVA) Storage product allows pooled disk capacity to be presented to hosts in
the form of one or more variably-sized physical devices. The EVA consists of disks, controllers, cables, power
supplies, and controller firmware. An EVA may be thought of as a storage system, a virtual array, or a storage
array. In this paper the term EVA is also used to refer to classic HP EVA4400/6400/8400 Storage products and
the HP EVA P6000 Storage.
Failover
The failover process causes one controller to assume the workload that was previously running on a failed,
companion controller. Failover continues until the failed controller is once again operational.
Host
A host is a computer that runs user applications and uses information stored on an array.
LU
The logical unit (LU) is a SCSI convention used to identify elements of a storage system; for example, hosts see
a virtual disk as an LU. An LU is also referred to as a Vdisk. The logical unit number (LUN) assigned by the user to
a Vdisk for a particular host is the LUN at which that host will see the virtual disk.
LUN
The logical unit number (LUN) is a SCSI convention used to enumerate LU elements; for example, the host
recognizes a particular Vdisk by its assigned LUN.
Management server
A management server runs management software such as HP Command View EVA and HP Replication
Solutions Manager.
RDM
VMware Raw Device Mapping (RDM) technology allows an LU to be mapped directly from an array to a VM.
SAN
A Storage Area Network (SAN) is a network of storage devices that includes the initiators required to store
information on and retrieve information from these devices; the SAN includes a communications infrastructure.
Server-based
management
The term “server-based management” implies management from a server.
SSSU
The Storage System Scripting Utility (SSSU) is an HP command-line interface that can be used to configure and
control EVA arrays.
Storage area
network
See “SAN”.
Storage array
Generic term for an HP EVA Storage product.
Storage system
Generic term for an HP EVA Storage product.
Storage System
Scripting Utility
See “SSSU”.
UNMAP
SCSI command used for space reclamation.
UUID
The Unique Universal Identifier (UUID) is a unique, 128-bit identifier for each component of an array. UUIDs are
internal system values that cannot be modified by the user.
Vdisk
See “virtual disk”.
Virtual array
Generic term for an EVA; see also “virtual disk”.
Virtual disk
A virtual disk provides variable disk capacity that is defined and managed by the array controller. This capacity is
presented to hosts as a disk. A virtual disk may be called a Vdisk in the user interface.
VM
A virtual machine is a guest operating system that runs on a vSphere (ESX) host.
Vraid
Vraid is an EVA representation of RAID levels.
WWNN
World Wide Node Name
WWPN
World Wide Port Name