HP P2000 G3 Reference Guide

HP StorageWorks P2000 G3 MSA System SMU Reference Guide 139
Glossary
CAPI Configuration Application Programming Interface. The proprietary protocol used for
communication between the Storage Controller and the Management Controller in a
controller module. CAPI is always enabled.
CHAP Challenge-Handshake Authentication Protocol.
chunk size The amount of contiguous data that is written to a vdisk member before moving to the next
member of the vdisk.
compatible disk A disk that has enough capacity to replace a failed disk and is the same type (SAS or
SATA).
dedicated spare A disk that is reserved for use by a specific vdisk to replace a failed disk. See compatible
disk.
default mapping Host-access settings that are configured when a volume is created, and that apply to all
hosts that are not explicitly mapped to that volume using different settings. See also explicit
mapping and masking.
drive spin down (DSD) A power-saving feature that monitors disk activity in the storage system and spins down
inactive SAS and SATA disks, based on user-selectable policies.
dual-port disk A disk that is connected to both controllers so its data path is fault-tolerant.
dynamic spare An available compatible disk that is automatically assigned, if the dynamic spares option is
enabled, to replace a failed disk in a redundant vdisk. See compatible disk.
EC Expander Controller. The processor (located in the SAS expander in each controller module
and expansion module) that controls the SAS expander and provides SES functionality. See
also EMP.
EMP Enclosure management processor. An EC subsystem that provides SES data such as
temperature, power supply and fan status, and the presence or absence of disks.
explicit mapping Access settings for a host to a volume that override the volume’s default mapping. See also
default mapping and masking.
FC Fibre Channel interface protocol.
global spare A disk that is reserved for use by any redundant vdisk to replace a failed disk. See
compatible disk.
host An external port that the storage system is attached to. The external port may be a port in
an I/O adapter in a server, or a port in a network switch.
image ID A globally unique serial number that identifies the point-in-time image source for a volume.
All volumes that have identical image IDs have identical data content, whether they be
snapshots or stand-alone volumes.
IQN iSCSI Qualified Name.
iSCSI Internet SCSI interface protocol.
iSNS Internet Storage Name Service.
jumbo frame In an iSCSI network, a frame that can contain 9000 bytes for large data transfers. A normal
frame can contain 1500 bytes.
leftover The state of a disk when its metadata says the disk is a member of a vdisk but other
members' metadata say the disk isn't a member. The metadata must be cleared before the
disk can be used in a new vdisk or as a spare.
loop Fibre Channel Arbitrated Loop (FC-AL) topology.
masking Volume-mapping settings that specify no access to that volume by hosts. See also default
mapping and explicit mapping.
master volume A volume that is enabled for snapshots and has an associated snap pool.

HP P2000 G3 Specifications

General

Brand	HP
Model	P2000 G3
Category	Storage
Language	English