I have been hit by my inexperience with power supplies... I bought a Ablecom (SuperMicro) PWS-801-1R redundant power supply. But this is in fact a module, that is not redundant in itself, and must be plugged into ... don't know what ??? So my question is : what is needed to assemble a redundant power supply for a 3U rack, idealy from a PWS-801-1S part ? Is there any standard ?
I'm not sure what you're asking, so I'll answer the two questions I think you're asking -- let me know if I'm off base:
Q1: What is required to provide redundant power to a server?
You need the following:
- A server that supports redundant power supplies.
- compatible power supply modules.
- Two separate sources of power (different circuits/UPS feeds/etc. that are reasonably independent)
Q2: What is required to provide redundant power to a whole rack?
Way more than just redundant power supplies in the server. You will need, at a minimum:
- Two independent sources of power
(This can be as simple as separate breakers, or infinitely more complex: 2 UPS systems, multiple utility feeds, utility + full-time generator, etc.)
- Redundant power distribution
(either a "dual-infeed" CDU or two CDUs/power strips - connected to the 2 sources in (1) via separate circuits)
- Redundant power supplies in all servers
(One PSU connected to each distribution unit in (2))
In power, as in all things, true redundancy is expensive.
Supermicro lists them on their store site under 'Server Accessories' and then 'Power Distributors'
I believe this is exactly the piece you were looking for; because it took me ages to find them without being only included in a chassis / etc.
As far as which power supply modules are compatible with which Power Distributors; I have yet to find an effective method.