Best Practices for Distributing Power Load Across Redundant PDUs
All -
Looking for some recommendations or best practices for calculating power load and how to properly distrubute across redundant pdu's. I'm a newbie so any help would be greatly appreciated.
Not to be obvious, but actual power load can be measured easily at several points in the distribution system, depending on your interest. And, the best way to balance loads with redundant PDUs is to split the load between them, making sure that neither circuit is loaded to more than 50% of capacity.
Can you elaborate on what you mean? Is this a homework assignment, or are you involved with an actual data center?
Thanks for the reply KenB and the welcome to the forum.
Yes, It's an actual data center assignment, I'm new to this portion of it. I've split up my equiptment across the pdu's for redundancy, but wasn't sure how to properly calculate the power load from each device.
I guess what I'm really looking for the is the correct calculation for determining power load for each device or rack. From their I should be able to accuratley track the amount of power load for each pdu after I've applied the power draw from it.
Thanks for the replies. We currently don't have pdu's that monitor power draw, it's a brand new facility and I was trying to make sure the load was spread out evenly using a manual process.
I'm splitting my dual power supplies across both pdus for redundancy, and need to know what the power load (draw) is. I know their is a formula for calcualting what the draw would be, but can't seem to find out.
I've found the specs posted by the manufacturer to be if you run the equipment at 100% all the time. I very rarely see that.
If you want accurate information and your strips are not metered and your breakers are not metered...I think your best bet would to buy your electrician a case of tastey beverage and ask him to put an amp-clamp on the lines in the breaker box (that's what I generally call a PDU...). For sure, that is the best way to figure out power draw.
I recommend getting one power strip that is metered in a lab setting and running various servers on it to see what the individual load is. Or you could make it part of the installation process to put it on the metered strip to determine expected load before going into production.
Edit:
Think of the cost justification for metered power strips. How much of your time and other's time are you going to chew up to determine this information?