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Chapter 1 Storage Overview
I-6
<Components identification>
In the 3000/4000 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 multiple disk
enclosures to be connected to basic cabinet is called as “Extended Cabinet (EC)”. The 3000/4000
series disk array 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.
The 2800 series disk array is composed of Disk Array Controller (DAC) and one or more disk
enclosures. (There has no concept of basic cabinet and extended cabinet as in the 4000 series). It
can mount 15 physical disks (PDs) per disk enclosure. Only one PD management group (PD group) is
defined in it (i.e., all physical disks belong to one PD group). There is no concept of array group.
The 2000 series disk array is composed of Disk Array Controller (DAC) and one or more disk
enclosures. (There has no concept of basic cabinet and extended cabinet as in the 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 100/1000 series disk array, Disk Array Controller (DAC) and DE which are in different cabinets
in the 2000 series are put in the same cabinet. 15 Physical Disks (PDs) can be carried in Disk Array
Controller (DAC). Because there is not the concept of array group, the Physical Disks connected to
the same group are managed as one group (PD group).