Got a bit of a major task on over the next 12 months (which I'll blog about later), but the start of the process is moving the Server Room to a new location.
The room the equipment is going into is about to be gutted and kitted out, but the question that will come my way shortly is how much power will I need?
The old server room has 2 x 42U racks in, and both are just plugged into the wall socket on their own 32A Circuit. Not ideal, but I only have 7 servers at present. This number may grow in the short term, but long term hopefully reduce if we start to virtualize.
The question is, what would be a 'standard' power requirement for each rack? I could work it all out, but servers will be changing over time. One electrical contractor I spoke to a while back suggested have a separate 16A feed for each rack, which seems reasonable.
What power feed do you have each rack in your server rooms?
Looks like I'm going for 4 racks in total; 2 for the servers, 1 for the Core Switch(es) and 1 for the fibre patch panels.
Again, thanks in advance.
my servers are not rackmounted but run off a big ups which is hardwired. Why put your fibre patch panels in a seperate rack.
It really does depend on a lot of factors. For example, some servers I've installed recently are actually much more powerful and less power consuming than the existing servers. In some cases as you have seven servers, I suspect you probably could merge two into one. It depends what they're hosting I suppose.
16A for a 42U rack seems more than enough. Switches generally consume relatively low power (especially modern switches) and many are completely silent as there are no fans at all.
When I worked in a datacentre we supplied racks with a 16A spine each, which was more than enough for a dense (filled with 1U shelves) rack. There was plenty of overhead for spike demands, so you can probably get away with sharing that between two or even three racks in your new room.
It's more important that you make sure the phases are relatively clean, that if you can you have smoothing equipment at source, etc to minimise wear and tear on the kit. And of course, you'll be putting UPSs in too
We have a 16A supply for our rack - with two 16A plugs, one for each UPS.
They're commonly called conditioners and installed either as part of the distribution board or as part of a distribution device in the rack itself.
if you need to take the ups offline, then it would be good to have clean power for however long, but you can build that redundancy in with a second power conditioner (ups). Adding a second ups would have the advantage of being cheaper than having a line conditioner installed. Plus the second ups would have battery backup for graceful shutdown.
for a small single server room with 2-4 rack install i'd defintely do with either a N+1 ups if the money is there. If not then 2N ups. 2x 16A feeds coming from 2 ups. i don't know whether you'd need some sort of transfer switch sitting between the ups and the dual psu servers ?
Plus, are you sure about the cost ? dedicated line conditioners are pretty pricey, surge supressers are cheap, but the alternative install cost of a proper TVSS or isolation transformer plus surge supression for the supply to the server room would cost as least as much as a UPS if not more based on the single quote i've had. Told straight off the bat that a line conditoner would be much more costly than an isolation transformer.
sorry for the inquistion, but i'm looking into getting cheap [as possible] clean power for the supply feeding our server room. And curious as to recommend products that would fit the bill. without breaking the bank.
You're right that a full supply protection in the wall would be more expensive though. But a conditioner per rack plus one on the desk for other bits and pieces really isn't so much of a problem, is it?
Samson PS10 19" Rackmount Power Conditioner - DV247.COM ?
Hope you don't mind me taking this slightly off topic but I notice you may be in the market for some cabinets.
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