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Chapter 2 Storage Overview
Component (abbreviation)
Disk Enclosure
(DE)
Physical Disk (PD)
Logical Disk (LD)
(2) Logical disk configuration
In disk array, RAID is built from virtual media that bind two or more physical disks (PDs).
These virtual media are called "RANK" in the NEC Storage series disk array, and disk that
RANK is sub divided to easy-to-use size, is called logical disk (LD). On this account, one LD
can store data to two or more PDs that configure RANK.
Table 2-1 Component list (2/2)
Configuration devices (abbreviation)
Power Supply
(DE_PS)
Fan
(DE_FAN)
Adapter Card
(DE_ADP)
Extended Cabinet Junction Box
(EC_JB)
Temperature Alarm
(DE_TEMP_ALM)
Back Board
(DE_BB)
Figure 2-6 Logical Configuration of Disk Array
I-14
Description
Power supply part in DE (Disk Enclosure).
Cooling fan in DE to maintain the constant
temperature inside of the unit.
Adapter Card for connection between PD
and DD.
Connection part of AC power cable in the
extended cabinet. It supplies electric
power to components (configuration
devices) of cabinet.
Temperature abnormality detection part
with temperature sensor in DE.
Back board connecting each component
(configuration devices) in DE.
Physical Disk
Logical Disk (disk from operation host
side)
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