NEC Storage Manager Configuration Setting Tool User's Manual page 15

Chapter 2 Storage Overview
<Components identification>
In the NEC Storage 4000/3000 series disk array, the cabinet composed of Disk Array controller and two
or more disk enclosures is called as "Basic Cabinet (BC)" and the cabinet that is composed of plural
disk enclosures to be connected to basic cabinet is called as "Extended Cabinet (EC)". NEC Storage
4000/3000 series can mount 10 or 15 Physical Disks (PDs) per disk enclosure, and 4 disk enclosures are
managed as 1 group (array group). Individual PD has identification number per PD management
group (PD group) that includes the above 4 array groups. Thus the combination of PD group number
and PD position number enables identifying of the physical mounting place of the PDs.
In the same way, unique identification number is assigned to other components in disk enclosure
(shown below), per controller unit, and this identification number enables components in the same disk
enclosure to be specified. But assignment of identification number depends on number of component in
disk enclosure.
NEC Storage 2000 series is also composed of DAC and one or more disk enclosures. (There is no
concept of basic cabinet and extended cabinet in NEC Storage 4000 series). It can mount 10 or 15
Physical Disks (PDs) per disk enclosure. PD management group (PD group) is defined depending on
the connection relation to disk array controller. (PDs connected to the same group are defined as one
PD group). There is no concept of array group.
In the NEC Storage 1000 series disk array, DAC and DE which are in different cabinets in NEC
Storage 2000 series are put in the same cabinet. 15 Physical Disks (PD: Physical Disk) can be carried in
DAC part. Because there is not the concept of array group, the Physical Disks connected to the same
loop are managed as one group (PD group).
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