This overview lists data center related glossary terms.

Block

A block in the room layout represents a section over which cables and cooling lines cannot be routed (such as a support column).

Breaker Panel  

In the breaker panel you can add breakers with an exact definition of position and capacity available. This enables you to map out and track power connections within the PDU and to reduce stranded capacity. When correctly configured the breaker panel provides an easy overview of available circuits, breakers, and phases. 

Capacity Group

A capacity group is a set of common capacity requirements or rules you define for a group of racks: same planned peak load, same planned average load, and same power source (PDU).

Capacity groups allow you to group your equipment, placing it in groups of racks with similar power capacity requirements. Grouping your racks in capacity groups with similar racks will help you plan and manage the capacity and prevent failure.

Capture Index (CI)

Unit of measure for how much exhaust airflow of a rack is captured by the cooling units included in that rack's equipment cluster.

Cold Aisle Capture Index (CACI): The cold aisle capture index is defined as the fraction of air ingested by the rack that originates from local cooling resources (e.g. perforated floor tiles or local coolers).

Hot Aisle Capture Index (HACI): The hot aisle capture index is defined as the fraction of air exhausted by a rack that is captured by local extracts (e.g. local coolers or return vents).

Based on these airflow patterns, the system calculates the following cooling values: Inlet temperature, Exhaust temperature, Estimated heat loss. The cooling values can be seen by selecting the Cooling tab in the Floor Layout, and hovering over a rack to see the tool tip.

Cluster

When used in connection with cluster environment, cluster is used as follows:

A computer cluster is a group of linked computers, working together closely thus in many respects forming a single computer. The components of a cluster are commonly, but not always, connected to each other through fast local area networks. Clusters are usually deployed to improve performance and availability over that of a single computer, while typically being much more cost-effective than single computers of comparable speed or availability.

Source: Wikipedia. Wikimedia Foundation, Inc. 5 May 2011

When used in connection with cooling, cluster is used as follows:

An equipment cluster is two nearly-equal-length rows of equipment separated by a hot or cold aisle. A row of equipment can be a member of one or two clusters.

Cubic Feet per Minute (CFM)

Unit of measurement used to measure the airflow of a cooling unit.

Data Set

This term is used in StruxureWare Data Center Operation: Insight. A data set is a collection of data. You can combine data from various data sets to make your custom report design. The data sets that have been exposed from StruxureWare Data Center Operation are available in StruxureWare Data Center Operation: Insight.

Data Source

This term is used in StruxureWare Data Center Operation: Insight. A data source is used for connecting to the database to get the requested data.

Distribution Redundancy

A type of redundancy setup in which the power distribution, not the power source, is redundant, using multiple rack PDUs.
Distribution redundancy does not provide as much security as the full redundancy setup at power source level (redundant UPS), because even if a server is connected to different Rack PDUs, the UPS remains the single point of failure.
In the system, you can come across these variations: DN and DN+1, see these explained in the Redundancy section.

Estimated Downstream Load

The Estimated Downstream Load value identifies how much capacity the selected piece of equipment (UPS, PDU, RDP, Power Panel) needs from its power supply to distribute the power you plan to the connected equipment. This value is the sum of the estimated load of the connected equipment, i.e. the sum of what has been set per piece of equipment in Properties > Power > estimated load value.

Gap

A gap icon in a room layout represents a section over which cables and cooling lines can be routed (such as a walkway or ramp).

Genome

The Genome Library is a database extended with thousands of additional measured server power profiles, storage and switch specifications. This continuously growing asset library enables StruxureWare Data Center Operation to determine power consumption without hardware sensors.
This is a read-only library of available products you can select from and add to the customizable list of Genomes to use in your data center infrastructure.

Group's Planned Average Load

The planned average load per rack in a capacity group. It identifies the estimated load allowed on average for racks that are included in the capacity group. Some racks are allowed to draw up to peak value, but this will cause other racks to be allowed to draw less than the average value.

Group's Planned Peak Load

The maximum load that is allowed for any rack included in the capacity group. It should never exceed the physical capabilities of any rack in the group. A well-balanced planned peak and planned average power draw ratio will help you plan an even load in all racks and avoid stranded capacity.

High Availability

High Availability enables you to run in a clustered environment with multiple servers for improved performance. You must have a Cluster node for high availability and disaster recovery license for each node in a cluster setup. The Cluster node for high availability and disaster recovery license is also needed for disaster recovery configurations.

Key Performance Indicator (KPI)

KPI is a business term used for critical data collected to measure the success of a business. When you use software supporting KPI trending, it enables you to identify areas of improvement to most efficiently spend resources where they are needed the most.

Local Mode

When using the StruxureWare Data Center Operation: Mobile, you can work in either local or server mode. Local mode means that you are working in a local copy. It does not require that you have network connection and your changes will not be updated in the StruxureWare Data Center Operation client application until it is synchronized. The StruxureWare Data Center Operation: Mobile will also receive changes made by other users when synchronized.

Measured Average Load

The measured average load per rack. The measured average value is measured over a specified period of time, and will be affected by any changes to the load in that period, e.g. due to equipment being switched off for maintenance.

Nameplate

The nameplate value is used by the system in case no power measurements are available. It is the specified worst case power draw. When you can get the actual power draw, use this data instead of the much higher nameplate value.

Manufacturer's nameplate
The guaranteed value the manufacturer specifies that the product will never exceed.
This value is used by the system if more precise values or measurements are not available.

Adjusted nameplate
Adjusted nameplate < Manufacturer's nameplate

You can reduce the manufacturer's nameplate value to the adjusted value when you know the actual power consumption of the product and to allow the system to perform more precise calculations.

If the system does not have access to power measurements through system integration but you have measured values in some other way, you can select Use manually entered measurements in the equipment's Power Distribution properties and type the value. This will override the nameplate value and provide even more precise calculations.

Network Communication Endpoint

Equipment that is not network gear as such, rather equipment that is connected to a network, such as a server or PDU.

Network Gear, Layer 1, 2, 3

Network equipment such as switches, routers, patch panels, etc.

  • Layer 1: Non-powered non-intelligent network equipment, e.g. a patch panel.
  • Layer 2: Powered non-intelligent network equipment, e.g. a hub.
  • Layer 3: Powered intelligent network equipment, e.g. a switch or router.

Network Redistribution Point

Network gear, such as routers and switches.

Node

When used in connection with licenses, such as the StruxureWare Data Center Operation: Capacity license, a node is a rack supported by the license. You must buy a license covering as many racks as you want supported (10, 100, etc.).
When used in connection with cluster setup, a node is a single server that is part of a distributed installation with multiple servers. You must buy a license per additional node added to the cluster setup.

Partial loading

Partial loading means that the system only loads active parts of the application (rooms, etc. on demand). Because the system does not need to load the entire data center model all the time, performance is increased significantly.

Phase Balancing

Phases are also referred to as L1, L2, L3. If the load of equipment is distributed on more than one phase, make sure the load is distributed evenly on all phases in a Capacity Group to obtain an optimum solution. The configuration of phases is done in the Properties.

Plenum

A pocket of space used for air distribution below a raised floor or above a suspended ceiling.

Power Buffer

When doing capacity planning, some racks are allowed to draw up to peak value, but this will cause other racks to draw less than the average value. This means that the maximum additional load that can be added to a rack equals the Remaining Power and Power Buffer. In line with the group's Reserved Power being utilized, the Power Buffer will decrease.

Power Capping

Power capping is a method to get the most out of the available capacity in your data center. When you cap the power consumption of a server or a group of servers, you set a fixed limit that the server will not exceed, regardless of its current workload. The cap has no effect until the server reaches its power consumption limit. At that point, a management processor adjusts CPU performance states and clock throttling to limit the power consumption and prevent the breakers from tripping.

Power Feed

This term is used in connection with a redundant configuration where one UPS is referred to A feed and the other as B feed.

Redundancy

The provision of multiple interchangeable components to perform a single function in order to cope with failures and errors, e.g. the setup of more power supplies to reduce the risk of failure of the entire system in case one of them fails.

You may come across these terms in connection with redundancy in the system:

Power redundancy:

  • N: No redundancy.
  • N+1: One UPS with one redundant power module (also referred to as internal redundancy in the UPS Power properties page). If the UPS fails, there is no redundant UPS serving as backup, but if one of the power modules inside the UPS fails, the redundant module ensures that the UPS still has full capacity. In other words, the spare power is at least equal to the capacity of one system module.
  • 2N: Two UPS where one serves as backup for the other in case one of them fails. One UPS is referred to as A feed and the other as B feed.
  • 2N+1: This is a combination of N+1 and 2N for combined external and internal redundancy, both one redundant UPS and one redundant power module inside both UPS.
  • DN: This is a combination of D (distribution redundancy*) and N (above). For this type of redundancy, the power distribution is redundant but there is no redundancy on the UPS level. Therefore, you are still vulnerable to failure on the power supply.
  • DN+1: This is a combination of D (distribution redundancy*) and N+1 (above). For this type of redundancy, the power distribution is redundant and there is internal redundancy on the UPS level (one UPS with one redundant power module).
  • Distributed Redundant UPS systems: Three or more UPS where one serves as backup for the others in case one of them fails. There are 3 types of design and you can learn more here.

    *In this case, distribution redundancy is referring to rack PDU redundancy, not UPS level redundancy.

Cooling redundancy:

  • N: There are no redundant cooling units for the rack.
    There are one or more coolers in the data center. If ONE cooler fails anywhere in the data center, it would result in inadequate cooling (yellow or red CI).
  • N+1: There is one redundant cooling unit for the rack.
    ONE cooler (CRAC, row-based, or OA unit) can fail anywhere in the data center and cooling will still be adequate (green CI).
  • N+2: There are two redundant cooling units for the rack.
    TWO coolers (CRACs, row-based, or OA units) can fail anywhere in the data center and cooling will still be adequate (green CI).
  • N+x: There are x redundant cooling units for the rack.
    X coolers (CRACs, row-based, or OA units) can fail anywhere in the data center and cooling will still be adequate (green CI).

Remaining Power

The Remaining Power value identifies how much power capacity remains in the rack without exceeding the allowed average load that you planned for the racks in the active capacity group.

Reserved Capacity

The Reserved Capacity value identifies how much capacity the selected piece of equipment (UPS, PDU, RDP, Power Panel) needs from its power supply to distribute the power you plan to the connected equipment. This value is the sum of the estimated load of the connected equipment, i.e. the sum of what has been set per rack in a capacity group in Properties > Capacity > estimated load.

Server Mode

When using the StruxureWare Data Center Operation: Mobile, you can work in either local or server mode. Server mode means that you are working in the database on the server, and any saved changes will immediately be updated in the StruxureWare Data Center Operation client application as well. Any changes made by other users will also be instantly reflected in the StruxureWare Data Center Operation: Mobile.

Stranded Capacity

Capacity that cannot be utilized by IT loads due to the design or configuration of the system. The presence of stranded capacity indicates an imbalance between two or more of the following capacities: Floor and rack space, Power, Power distribution, Cooling, Cooling distribution.

Tags

Tags are category labels that can be created and assigned to equipment in the floor or rack layout to group equipment. Tags can be used to help plan the best place for new equipment automatically.

Temperature Map

A color map showing the temperature in different parts of a room. The temperature map is 3-dimensional with movable planes.

Temperature Plane

The temperature plane is a movable plane (vertically and horizontally) that shows a color-coded cross section of the temperature in the room.

Unreserved Capacity

The unreserved capacity value identifies how much remaining power there is for the selected PDU, RDP, or Power Panel. That means that this value does for instance not take into account that other power distribution units may reduce the actual value.

Velocity Plane

The velocity plane is a movable plane (vertically and horizontally) that shows a color-coded cross section of the airflow vectors in the room.

Wizard

A wizard leads you through dialog steps.

Work Order

A work order contains tasks. A list of work orders can be created in the system, listing what actions need to be executed in the data center, e.g. installing new servers in specific positions.

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