fx2

Hello

Did you swap both power supplies to 2000w, and are they receiving the same input voltage? Both PSUs must have the same maximum power output to operate in a redundant configuration. The input voltage will change the power output.

Thanks

yes we swapped both. is there a specific configuration for redundancy? if we try grid redundancy the server won't boot. 

if we try grid redundancy the server won't boot.

The server functions in a 2+0 configuration but not a 1+1?

Did you change anything else when you upgraded from 1600w PSUs? Were you having any issues with 1600w PSUs?

If you added hardware and it is only working in a 2+0 configuration then you are likely drawing more power than the PSUs are outputting. The PSUs only output around half of their rated wattage on a 120v power connection, so upgrading from a 1600w PSU to a 2000w PSU is only a 200w increase in available power.

Thanks

can you explain 2+0 and 1+1?

we didn't change anything else. we have only 2 sleds in this unit. we thought changing to the 2000W supplies would give us full redundancy similar to a typical r730 which we use now. is that possible? 

thanks for your help 

can you explain 2+0 and 1+1?

Redundancy policies are explained starting on page 132 of the CMC version 2.0 FX2 manual:

www.dell.com/support/home/product-support/product/poweredge-fx2/

The enclosure manual has information about the expected wattage of the power supply units based on the input voltage.

we thought changing to the 2000W supplies would give us full redundancy similar to a typical r730 which we use now.

If you have two of the same PSUs that are connected to the same input voltage then you should be able to run them in a redundant/1+1 configuration. If you are only able to power on the nodes when the PSUs are in a non-redundant/2+0 configuration then the nodes require more power than a single PSU can supply. You will need to use 240v input to increase the available power to the nodes.

Thanks

. if this is the case it looks like Dell does not have a solution for 1+1 for these 120V servers. we were planning to purchase and deploy more of these but our computer rooms are already built out for 120V and it's cost prohibitive to convert toe 220V now. we only have 2 sleds in these which I would think 1 psu could handle that. 

thanks for the update.

Hi Bagek and Daniel,

Not sure if I have understood completely this conversation. Apparently resolution is that, even changing to 120Vac-2000 Watts power supply, FX2 is not able to run in 1+1 redundancy. Not able to support a single failure upon failure of PS or voltage feed. Correct?

Is it any solution to be given on the future for 120Vac market from Dell?

Thanks and best regards,

Alfonso