IBM Flex System V7000 Expansion Enclosure 4939H29 ユーザーズマニュアル

Chapter 1. Introduction to IBM Flex Systems and IBM PureSystems offerings 

Draft Document for Review January 29, 2013 12:52 pm

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Up to six 2500W power supply modules. 

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Up to six fan modules consisting of four 80 mm fan modules and two 40 mm fan modules. 
Additional fan modules may be installed to a total of ten modules.

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Up to four I/O modules.

A maximum of six power supplies may 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 40mm cooling fan modules, that pick power up from the midplane, not from the 
power supply. 

The chassis allows configurations of power supplies to give N+N or N+1 redundancy. A fully 
configured chassis will operate on just three 2500W power supplies with no redundancy, but 
N+1 or N+N is likely to be preferred. 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 may 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 may also be fed from single phase 200-240 VAC supplies if required.

There are different vendors that may vary slightly in the terminology when describing power 
supply unit (PSU) redundancy. In general ‘N’‘ is the minimum number of PSUs required to 
keep the server operational, in this case to keep the populated IBM Flex System Enterprise 
Chassis operational. The term ‘N+1’ is the minimum number of PSUs plus one. This is not the 
best option for redundancy, it is the equivalent of a ‘hot spare’ and will protect against PSU 
failure only.

The minimum number of PSUs required to keep the server or chassis operational duplicated 
or doubled is referred to as ‘N+N’. The PSUs are fully redundant where there will be an even 
number for minimum ‘N+N’ support. 

Note: The 2100W power supplies are only available via Configure to Order (CTO). For 
more information about the 2100W power supply refer to IBM PureFlex System and IBM 
Flex System Products and Technology, SG24-7984.