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.
Compatibility for PWS-801-1R
* Supermicro A+ Server 4021M-32R * Supermicro A+ Server 4021M-T2R+ * Supermicro A+ Server 4021M-82R+
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.