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40 DS8000 Series: Concepts and Architecture
Primary power supplies
The DS8000 primary power supply (PPS) converts input AC voltage into DC voltage. There
are high and low voltage versions of the PPS because of the varying voltages used
throughout the world. Also, because the line cord connector requirements vary widely
throughout the world, the line cord may not come with a suitable connector for your nation’s
preferred outlet. This may need to be replaced by an electrician once the machine is
delivered.
There are two redundant PPSs in each frame of the DS8000. Each PPS is capable of
powering the frame by itself. The PPS creates 208V output power for the processor complex
and I/O enclosure power supplies. It also creates 5V and 12V DC power for the disk
enclosures. There may also be an optional booster module that will allow the PPSs to
temporarily run the disk enclosures off battery, if the extended power line disturbance feature
has been purchased (see Chapter 4, “RAS” on page 61, for a complete explanation as to why
this feature may or may not be necessary for your installation).
Each PPS has internal fans to supply cooling for that power supply.
Processor and I/O enclosure power supplies
Each processor and I/O enclosure has dual redundant power supplies to convert 208V DC
into the required voltages for that enclosure or complex. Each enclosure also has its own
cooling fans.
Disk enclosure power and cooling
The disk enclosures do not have separate power supplies since they draw power directly from
the PPSs. They do, however, have cooling fans located in a plenum above the enclosures.
They draw cooling air through the front of each enclosure and exhaust air out of the top of the
frame.
Battery backup assemblies
The backup battery assemblies help protect data in the event of a loss of external power. The
model 921 contains two battery backup assemblies while the model 922 and 9A2 contain
three of them (to support the 4-way processors). In the event of a complete loss of input AC
power, the battery assemblies are used to allow the contents of NVS memory to be written to
a number of DDMs internal to the processor complex, prior to power off.
The FC-AL DDMs are not protected from power loss unless the extended power line
disturbance feature has been purchased.
2.7 Management console network
All base models ship with one Storage Hardware Management Console (S-HMC), a keyboard
and display, plus two Ethernet switches.
S-HMC
The S-HMC is the focal point for configuration, Copy Services management, and
maintenance activities. It is possible to order two management consoles to act as a redundant
pair. A typical configuration would be to have one internal and one external management
console. The internal S-HMC will contain a PCI modem for remote service.