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20 DS8000 Series: Concepts and Architecture
2.1 Frames
The DS8000 is designed for modular expansion. From a high-level view there appear to be
three types of frames available for the DS8000. However, on closer inspection, the frames
themselves are almost identical. The only variations are what combinations of processors, I/O
enclosures, batteries, and disks the frames contain.
Figure 2-1 is an attempt to show some of the frame variations that are possible with the
DS8000. The left-hand frame is a base frame that contains the processors (eServer p5 570s).
The center frame is an expansion frame that contains additional I/O enclosures but no
additional processors. The right-hand frame is an expansion frame that contains just disk
(and no processors, I/O enclosures, or batteries). Each frame contains a frame power area
with power supplies and other power-related hardware.
Figure 2-1 DS8000 frame possibilities
2.1.1 Base frame
The left-hand side of the base frame (viewed from the front of the machine) is the frame
power area. Only the base frame contains rack power control cards (RPC) to control power
sequencing for the storage unit. It also contains a fan sense card to monitor the fans in that
frame. The base frame contains two primary power supplies (PPSs) to convert input AC into
DC power. The power area also contains two or three battery backup units (BBUs) depending
on the model and configuration.
The base frame can contain up to eight disk enclosures, each can contain up to 16 disk
drives. In a maximum configuration, the base frame can hold 128 disk drives. Above the disk
enclosures are cooling fans located in a cooling plenum.
disk enclosure pair
disk enclosure pair
Battery
Backup unit
Primary
power
supply
Battery
Backup unit
I/O
enclosure 0
I/O
Enclosure 1
I/O
enclosure 2
I/O
Enclosure 3
disk enclosure pair
disk enclosure pair
Primary
power
supply
Rack
power
control
eServer p5 570
eServer p5 570
Cooling plenum
disk enclosure pair
disk enclosure pair
disk enclosure pair
disk enclosure pair
disk enclosure pair
disk enclosure pair
disk enclosure pair
disk enclosure pair
Battery
Backup unit
Battery
backup unit
Battery
Backup unit
Primary
power
supply
Primary
power
supply
Cooling plenum
Fan
sense
card
I/O
enclosure 4
I/O
Enclosure 5
I/O
enclosure 6
I/O
Enclosure 7
disk enclosure pair
disk enclosure pair
disk enclosure pair
disk enclosure pair
disk enclosure pair
disk enclosure pair
disk enclosure pair
disk enclosure pair
Primary
power
supply
Primary
power
supply
Cooling plenum
Fan
sense
card
Battery
Backup unit