Chapter 1. Introduction to IBM Flex Systems and IBM PureSystems offerings 13
The following components can be installed into the rear of the chassis:
Up to two IBM Flex System Chassis Management Modules (CMM).
Up to six 2500W power supply modules.
Up to six fan modules consisting of four 80 mm fan modules and two 40 mm fan modules.
Additional fan modules can be installed, up to a total of ten modules.
Up to four I/O modules.
1.3.1 Chassis power supplies
A maximum of six power supplies can be installed within the Enterprise Chassis. The PSUs
and empty PSU bays can be seen in Figure 1-5 on page 12. The power supplies are 80 PLUS
Platinum certified and are 2100 Watts and 2500 Watts output rated at 200VAC, with
oversubscription to 2895 Watts and 3538 Watts output at 200VAC respectively. The power
supply operating range is 200-240VAC. The power supplies also contain two independently
powered 40 mm cooling fan modules that pick power up from the midplane, not from the
power supply.
Highlights
The chassis allows configurations of power supplies to give N+N or N+1 redundancy. A fully
configured chassis will operate on just three 2500 W power supplies with no redundancy, but
N+1 or N+N is likely to be preferred. Using three (or six with N+N redundancy) power supplies
allows for a balanced 3-phase configuration.
All power supply modules are combined into a single power domain within the chassis, which
distributes power to each of the compute nodes, I/O modules, and ancillary components
through the Enterprise Chassis midplane. The midplane is a highly reliable design with no
active components. Each power supply is designed to provide fault isolation and is hot
swappable.
There is power monitoring of both the DC and AC signals from the power supplies, which
allows the IBM Flex System Chassis Management Module to accurately monitor these
signals. The integral power supply fans are not dependent upon the power supply being
functional, they operate and are powered independently from the midplane.
Each power supply in the chassis has a 16A C20 3 pin socket and can be fed by a C19 power
cable, from a suitable supply.
The chassis power system is designed for efficiency using datacenter power consisting of
3 phase 60A Delta 200 VAC (North America) or 3 phase 32A wye 380-415 VAC
(international). The Chassis can also be fed from single phase 200-240 VAC supplies if
required.
Availability: The 2100W power supplies are only available by Configure to Order (CTO).
For more information about the 2100W power supply, see IBM PureFlex System and IBM
Flex System Products and Technology, SG24-7984.
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