IBM DS8000 Management console network, Primary power supplies, Disk enclosure power and cooling

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.

40DS8000 Series: Concepts and Architecture