Hot answers tagged

26 votes

Plugging in a server rack with UPSes into a room that has its own UPS backup issues

Your typical UPS (i.e., excluding a double-conversion UPS), including all APC SmartUPS that I've worked with in the past, does nothing to the power except when running on batteries. It will draw a ...
23 votes

Plugging in a server rack with UPSes into a room that has its own UPS backup issues

Every data center/server room I've ever been in and worked in, that had its own UPS system, has prohibited customers, clients, etc. from using their own UPS systems. I can't speak to power harmonics, ...
  • 109k
12 votes

Dell PowerEdge: powersaving BIOS settings differences

The following Dell Whitepaper goes in depth on the differences between the different power profiles: http://en.community.dell.com/techcenter/extras/m/white_papers/20248740 (page 20-36) Below you can ...
  • 295
8 votes
Accepted

Cisco Catalyst 2960 Switches - Can I reverse the air flow?

Cisco 2960 switches pull in cool air from the sides and exhaust to the rear. Depth-wise they are 1/3 to 1/2 rack-depth (depending on exact model switch and rack). This leaves you very few options. ...
  • 6,282
8 votes

How to decrease humidity level in a server room

I heard that using a dehumidifier can cause static charge buildup in the room. Then the server room was designed by an idiot. ANY server room I have seen in the last 30 years had the racks and (this, ...
  • 51.1k
8 votes
Accepted

How to decrease humidity level in a server room

humidity level inside the room is far from the ideal. That depends. "Ideal" usually means 0%, as no water based corrosion will be possible at all. Of-the-shelf servers, switches and ...
  • 4,557
8 votes

Plugging in a server rack with UPSes into a room that has its own UPS backup issues

Fire safety. The datacenter operators should be able to kill the power to the room, should an emergency happen. Your UPS units are outside of their control. Batteries themselves are dangerous. A ...
  • 614
6 votes
Accepted

In a 42U server rack with 12 very hot 2U-nodes, what is a good configuration? All nodes at the top or bottom?

This really shouldn't matter at all if your HVAC system is capable of handling your servers' thermal output.
  • 100k
6 votes

Is there a best placement of hot hardware in a rack to maximize convection cooling for the whole rack?

Basic physics: you will get the most cooling by putting the hottest units at the top and the coolest at the bottom (assuming cold air is entering at the bottom and hot air leaving at the top). ...
  • 161
6 votes
Accepted

Rack Server Width

The dimensions listed in the advertisements often only measure the main body of the server, and does not include the width of the mounting hardware, which is often optional. In any case, when you ...
  • 130k
6 votes

Difference and compatibility between IBM, Dell, HP server rails

Rackmount servers come with rails intended for that equipment. The rails are generally unique to the server model and manufacturer. It IS possible to buy generic universal rails, but there isn't a ...
  • 196k
6 votes

Plugging in a server rack with UPSes into a room that has its own UPS backup issues

Aside from the practical problems, most UPS manufacturers, including APC advise you not to do it and it will void your warranty. Additionally, using equipment not as designed may violate local ...
  • 1,206
5 votes

What is the proper way to connect cables from a patch panel to a switch when you have more ports on the patch panel than on the switch?

There's no need to match patch panel numbers with switch port numbers. It's not a scalable solution, and really doesn't add management value for an environment this size. Populate the drops that you ...
  • 196k
5 votes

Can any standard rack server or enclosure be mounted on sliding rails?

Short answer: It depends. Long answer: This is going to vary a lot from one chassis/enclosure to the next or even from one sub-model of enclosure to the next. Questions you need to consider: Are ...
  • 185
5 votes
Accepted

Can any standard rack server or enclosure be mounted on sliding rails?

Rail kits tend to be specific to the type of enclosure you're getting, since while the holes on the rack mounting post are standardized, the method of fastening rails to the case is not. What you may ...
5 votes

Is it possible to place your own equipment with AWS/GCE/Azure?

No, this is not possible. There are some instances where GCP/AWS/Azure will give access to some bare-metal services, they will not allow you to place your own equipment in their datacenters. Most ...
4 votes

Is there a best placement of hot hardware in a rack to maximize convection cooling for the whole rack?

Real racks arn't designed around natural convection based cooling. Any such assumption is bad. You'd have air trapped inside the case and more heat from any units below, and it will all melt down ...
4 votes
Accepted

How to wall mount a rack when studs don't line up

Either of your solutions (plywood or horizontal 2x4s) will work fine. If you do plywood, just mount a large enough piece to the wall that the entire rack can hang off of it, not just one side. Don't ...
  • 109k
4 votes
Accepted

How standardized are rack server components?

If using HP/Dell/similar nothing apart from the RAM and hard drives will be readily interchangeable from any other vendor or generic part. Technically you could swap out CPUs although the heat sinks ...
  • 711
4 votes

Cable management and Rack design

It's not possible to give you more than a few guidelines/suggestions: You don't say anything about power! What have you got for UPSes, PDUs? Power cables are harder to work with than network cables,...
4 votes

Difference and compatibility between IBM, Dell, HP server rails

In my experience, it's not possible to use rack mounts from different vendors on different machines. There may be some system where where generic cases are used, and thus, generic rails are available....
  • 274
4 votes

Cable management in cabinet and between cabinets

This depends on your environment and needs. Ideally, networking would be in a 2-post relay rack and servers in a 4-post rack. But if you're in a co-location facility, that may not be an option. ...
  • 196k
4 votes
Accepted

What is the name for the pieces of metal in a rack that cage nuts are installed into?

Mounting Flange. It's defined in "EIA-310-D, Cabinets, Racks, Panels, and Associated Equipment". It may not be easy to find a legitimately free (the EIA charges for it) copy online, but you can find ...
4 votes
Accepted

What kind of server rack is this? (Type and possible manufacturer)

iStarUSA WO22AB 22U 4 Post Open Frame Rack Link to site here
  • 56
3 votes

Cisco Catalyst 2960 Switches - Can I reverse the air flow?

With the strict hot/cold setup it seems like even if the airflow could be reversed leaving the switches at the back of the racks would have a negative impact since they would be sucking in air from ...
  • 2,741
3 votes
Accepted

UPS systems in parallel for redundancy and/or capacity, generator as backup, ATS,

Your first setup (with the Y cable) is the basic idea for a parallel UPS system, but you won't actually use a Y-cable; the UPSes would be hard-wired to an external paralleling system which should also ...
  • 4,171
3 votes

How to choose the right rack and UPS?

Dell sells rebadged APC rack and UPS equipment. I tend to think APC manufacture some of the nicest racks on the market. Since your order appears to contain Dell servers, storage and networking, I'm ...
  • 196k
3 votes
Accepted

Are Rack-Servers always loud?

Yep, these are always loud. Fans may go slower if the temperature's cold enough. Even though, you'll always ear it. Even with a couple closed doors in the way, ... In addition to the noise, you ...
  • 1,751
3 votes

What is "Node Composing" in Intel RSD?

In my opinion, "Node Composing" in intelRSD is not real virtualization. As mentioned in "pod-manager-api-specification": Currently a user can request allocation of a single node with a single ...
  • 131
3 votes

Difference and compatibility between IBM, Dell, HP server rails

The server/system manufacturer supplies the rails that fit to their equipment. There is no universal standard in that regard. Rail kits from one product line may not even fit another product line ...
  • 73.4k

Only top scored, non community-wiki answers of a minimum length are eligible