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Dell TechCenter Hello everyone - thanks for showing up to the Power Budgeting chat today. we'll start shortly after 3PM central time
Dell TechCenter Hi Tom (hypervfan)!
Dell TechCenter Hello Bill Shields
hypervfan Hi
Dell TechCenter How's everything in Norway?
hypervfan All good. Busy days :)
hypervfan Working on a project that's probably going to use Appassure for backup
Dell TechCenter awesome - good to hear. Glad you got to test drive it last year
hypervfan How are things going over in US?
Dell TechCenter crazy hot here
Dell TechCenter it's 95 with 100% humidity
Dell TechCenter and up to the north 5 hours driving, there are huge tornados
Dell TechCenter 33C i think
Dell TechCenter @Karen says 35C
hypervfan That's hot :)
Dell TechCenter yes. good exercise though
Dell TechCenter Hello everyone just joining, we'll wait a few more minutes before we start to wait for people to show up
Dell TechCenter Where is everyone on the chat from?
Dell - John Austin, Tx
david_moss Austin as well
Dell TechCenter are we customers, Dell sales, IT pros?
hypervfan Norway here
david_moss Dell cooling guy
Robert R UT Austin
Dell TechCenter cool pun intended
Dell TechCenter Hello Robert!
Dell TechCenter Let's kick it off -
Dell TechCenter Today's guests for the chat session are Kyle Cross and Reema Aron
Dell TechCenter They are engineers in the Dell Enterprise Solutions Group working on PowerEdge and Dell Power and Cooling
Dell TechCenter they will be sharing best practices in Power Budgeting today with everyone, and their chat will sync with the powerpoint presentation on the right
Dell TechCenter this presentation will be available for download along with the transcript tomorrow at
Dell TechCenter If at any time during the chat you have a question, feel free to ask and we'll try our best to answer
Kyle_Cross So hi everyone. My name is Kyle Cross, and I'm a senior engineer focusing on power working on Dell's PowerEdge servers.
Reema Aron Good afternoon everyone! I'm Reema Aron and I specialize in blade power management.
Kyle_Cross “Power and Cooling” is a high level category we use at Dell to cover a broad range of features.
Tony Harvey I'm getting no audio
Dell TechCenter With that, I'll turn the chat over to Kyle and Reema and they will walk us through some slides and answer questions about Power Budgeting
Bill Shields Should we be getting audio?
Dell TechCenter we also have some other Dell experts on the line if you have questions about general Power & Cooling
Dell TechCenter no audio on the chat - we're text only today.
Dell TechCenter I guess we should make that a bit more clear
Bill Shields OK, thanks
Tony Harvey NO problem thanks
Kyle_Cross You can see on the slide that "Power and Cooling" covers a broad range of topics, these are just a few.
Kyle_Cross Today we’ll be focusing on “Power Budgeting”, but if you have questions about other topics we can address them at the end (and possibly in future Tech Chats).
Kyle_Cross I see that folks are interested in the range of different server types, and that's good.
Kyle_Cross I tend to span all server types and Reema works closely with me, specializing in blade server aspects.
Kyle_Cross So if you are wondering what exactly Power Budgeting is, we’ll get to some details on that later, but at a high level it is just a series of calculations that make sure the power that your server uses is less than the power available from the PSUs.
Kyle_Cross Before we dive too deep into the details though, I think it makes sense to talk about why Power Budgeting is important.
Kyle_Cross We tend to place a pretty high importance on minimizing downtime in all aspects of our design. Interested in your feedback on that.
Kyle_Cross For starters, the consequences of incorrect power budgeting can be extreme: performance impacts or worse – data loss and unexpected down time.
Kyle_Cross At Dell we invest a lot of time making all aspects of the design reliable, and power is one of the most important ones.
Kyle_Cross (if I do say so myself)
Kyle_Cross Power Budgeting to fit inside the PSU capacity is key to reliable operation.
Kyle_Cross But there is a lot to consider!
Dell TechCenter in the slide to the right, what does TDP stand for?

Dell TechCenter what does it mean?
Reema Aron TDP stands for Thermal Design Point
Reema Aron The TDP is typically the rated power level that customer's typically see at the time of order
Kyle_Cross So on the left side of the slide, there is a chart that shows the dynamic power consumption of the server model.
Kyle_Cross Every 12G PowerEdge server model features a lot of configurable options – drive bays, PCIe slots, DIMM configurations, etc
Kyle_Cross Each with their own power consumption.
Kyle_Cross Add to that the fact that how you use the server, the “workload” as we call it, also has a major impact on power consumption, since some components, like the CPU, consume more or less depending on demand.
Kyle_Cross So you can see from the chart on the right how CPU power can fluctuate based on how you use the server.
Dell TechCenter So is Turbo the same as the dynamic range between min and max power?
Karen at Dell Can you explain more about the Dynamic Range?
Kyle_Cross @DellTechCenter Turbo is a feature of the CPU, it uses extra available power headroom when it is available
Kyle_Cross @Karen Sure, so the dynamic range is the full power range of how much power the server can consume.
Kyle_Cross The min power would be idle power or even lower power states the server is capable of.
Kyle_Cross The max power is when the sever is pushed to its limits with benchmarks, or high power customer workloads.
Karen at Dell Which component features cause a spike in power?
Kyle_Cross @Karen So the CPU is a major contributor, like what we show on the left.
Kyle_Cross *I meant right
Kyle_Cross There are also a lot of other components which draw varying power though - Memory, Hard Drives, Fans... just about every componet really.
Kyle_Cross So, its a little complicated, right?
Kyle_Cross These factors make budgeting enough power increasingly complex as the “dynamic range” between minimum and maximum power gets larger in every server generation.
Kyle_Cross So how do you choose the right PSUs for your needs?
Reema Aron We're going to do our next poll question, we'd appreciate your feedback!
Kyle_Cross So, beyond how power gets used in workloads and components, Dell offers a lot of choices for available power capacity.
Kyle_Cross (as you can see) :)
Kyle_Cross We give so many options so that customers can choose an option that is “right sized” for their needs.
Karen at Dell Can you explain a little about right sizing power?
Dell TechCenter Lots of people doing napkin math - seems like we should spend some time talking about how to select a PSU
Kyle_Cross Right sized means a PSU that is most efficient for a customer's use case.
Kyle_Cross A lot of it comes down to effeciency. Wherever your server spends the most time, at whatever ever amount of power, that is where you want the most efficiency
Kyle_Cross With just a few PSU options, its hard to tune efficiency for multiple points, with many it allows us to tune it for different workload levels.
Karen at Dell How can you determine the typical power that the server is using?
Kyle_Cross @Karen Some customers like to do their own testing to determine that, but Dell also provides an online tool called ESSA.
Kyle_Cross That's the "Energy Smart Solution Advisor"
miguel@dell Any recommended power savings settings for the BIOS?
Dell TechCenter If the powerpoint is a little small or if you want to go back and review previous slide, you can download the entire presentation at:
Kyle_Cross ESSA is a great tool that you can use to get advice on typical and max power consumption, as well as advisment on which PSU is best for you.
Dell - John Dell PowerEdge servers include System Profiles, which are essentially "easy buttons" for configuring the server for performance, performance per watt, and enhanced RAS.
John Barnhart- Dell keep in mind ESSA can be used server to server BUT it is best used to do data center or maybe I should more correctly say more than single server deplyment planning.
Dell - John Performance per Watt would be the preferred BIOS setting for saving power.
Kyle_Cross @John Barnhart That is good point. ESSA can be used on individual servers, but it is really a DataCenter planning tool, and it covers other Dell products like PowerVault and PowerConnect
John Barnhart- Dell should anyone need / want a rapid breakdown of Dell Perf/per watt claims feel free to email me at happy to provide that offline so as not to impede this discussion
Dell - John Please not that these BIOS settings improve power consumption for IDLE and typical workloads, but does not reduce the PSU capacity needed for the configuration.
Reema Aron thanks @Dell - John for providing the BIOS System Profile Information
hypervfan Keep in mind that some power settings might give you lower performance with for example Hyper-V and Live Migration
Dell - John For more info on BIOS settings, etc for reducing power consumption, see the "How To" whitepaper that I wrote:
Kyle_Cross @hypervfan Yes, that is true. This is part of the reason for the "easy buttons" like John described. Pretty much all power savings features impact performance to different degrees.
miguel@dell Great thanx

Reema Aron Blade servers also present complexities in power budgeting. A blade server chassis is a multi-node eco-system that shares a common power source.
John Barnhart- Dell If you need information RE: Dell UPS - www/
John Barnhart- Dell oops
Reema Aron Especially when using Grid Redundancy, the total chassis power available is limited
Reema Aron The blade chassis supports multiple different form factors with varying system configurations that have different power needs and must co-exist
Reema Aron Ensuring that we have adequate power budgeting is very important for blade server chassis
Kyle_Cross So this slide shows the high level view of how the Dell Power Budgeting feature works
Kyle_Cross First we determine the Server Power Range. We do that by a sophisticated inventory of all of the installed components.
Kyle_Cross It's important to note here that the power values we use for each installed component may not be what you'd expect.
Kyle_Cross Some parts, like the CPU, can have fast power transients that you can't see at the PSU input.
Kyle_Cross Taking a step back - we determine what is installed first
Kyle_Cross Then, we have a sequence of algorithms which assign power based on what installed.
Kyle_Cross This way we can dynamically predict the power consumption of the server, since we've discussed how the server power varies with installed components.
Kyle_Cross We invest a lot in this functionality, so that the server power consumption we predict is highly accurate.
Kyle_Cross Adding all of that up, after the first step we have a single system number for what we predict the server will consume.
Kyle_Cross ie how much power will it use.
Kyle_Cross In the next step, we compare that to how much power the PSUs can supply.
Karen at Dell Is the power you predict the max?
Kyle_Cross @Karen It is, in fact. We take into account fault scenarios and such to make sure that under any workload the server will be reliable.
Kyle_Cross It gets back to my previous statement about designing for high reliability.
Kyle_Cross We want customers to have piece of mind over the life of their server, even if they start with a lower power workload and amp it up later in life.
Khaled Omar what is the tool that can show the recent consumed power ?
Kyle_Cross @Khaled Omar there are a number actually. You can view it in the iDRAC GUI, or via the Open Manage Power Center.
Dell TechCenter @Khaled - to clarify iDRAC is on the individual server level
Kyle_Cross There are also racadm, WSMAN and similar commands.
Dell TechCenter and OpenManage Power Center is for monitoring your entire datacenter (by rack, row, etc)
Dell TechCenter @Khaled - does that answer your question?
Khaled Omar yes
Khaled Omar thanks
Khaled Omar soemthing else, about the PDUs
Kyle_Cross So quickly wrapping up, we check against the PSU capacity to determine if the server power will fit.
Khaled Omar is there a tool that can show the power that will be handeled by the PDU in a rack in case of multiple number of devices hoocked up to it ?
Khaled Omar without our calculations
david_moss A metered or managed PDU can tell you the total power on the pdu
Kyle_Cross @KhaledOmar ESSA  is the best tool for DataCenter level budgeting.
Kyle_Cross Like @david_moss mentions, if you want to look at real time power, there are various ways including looking accessing the PDUs directly.
Reema Aron More information on managed PDUs can be found at the following link:
Khaled Omar great
david_moss and
Reema Aron Sorry, I just linked you to our power budgeting paper regarding this tech chat, which will also be useful for everyone here!
Kyle_Cross As one closing thought on power budgeting - the final step is that if we find configurations that don't fit, we take action. We provide warnings, we throttle the server, and various other protections.
Reema Aron here's the link to the Managed PDU information:
Kyle_Cross This is really key, because these protections are the end state which prevent the unexpected downtime we referred to earlier.
Reema Aron So that concludes our tech chat presentation for today, are there any more questions we can address?
Dell TechCenter Thank you for joining everyone - hope you learned something new
Dell TechCenter the transcript for this chat will be online tomorrow at
Robert R Lots of useful info guys, thanks
Dell TechCenter also, the powerpoint presentation that we showed today is available at
Dell TechCenter Thanks Robert R! Hookem :)
Robert R \m/
Reema Aron and the white paper is located here:
Khaled Omar thanks all
Dell TechCenter thanks for joining Khaled