ENERGY STAR® Program Requirements
Product Specification for Data Center Storage
Draft Test MethodJune 201211 OVERVIEW

234The following test method shall be used for determining compliance with requirements in the ENERGYSTAR Product Specification for Data Center Storage, and when acquiring test data for reporting on theENERGY STAR Power and Performance Data Sheet.

52 APPLICABILITY

67The following test method is applicable to all products eligible for qualification under the ENERGY STAR
Product Specification for Data Center Storage.

83 DEFINITIONS

910Unless otherwise specified, all terms used in this document are consistent with the definitions in theENERGY STAR Eligibility Criteria for Data Center Storage.

1141213A) Input Power: Input power shall be as specified in Table 1 and Table 2. The frequency for input power
shall be as specified in Table 3.

1415B) Ambient Temperature: Ambient temperature shall be no less than 18 °C and no greater than 28 °C
over the duration of the test.

16C) Relative Humidity: Relative humidity shall be within 15% and 80%.

TEST SETUPENERGY STAR Program Requirements for Data Center Storage – Test Method (Rev. June-2012)

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Table 1: Input Power Requirements for Products with Nameplate Rated Power Less Than or Equal
to 1500 W
Product TypeSupply Voltage

Voltage Tolerance

Maximum Total
Harmonic Distortion

Storage Productswith Ac-Dc SingleOutput PSUs

230 V ac+/- 1.0 %2.0 %Storage Productswith Ac-Dc Multi­

230 V ac and/or
115 V ac

Optional Testing
Conditions For Ac-Dc
Japanese Market

100 V ac

Dc Storage Products+/- 53 V dc+/- 1.0 V

Table 2: Input Power Requirements for Products with Nameplate Rated Power Greater Than1500 W
Product TypeSupply Voltage

Voltage Tolerance

Maximum Total
Harmonic Distortion

Storage Productswith Ac-Dc SingleOutput PSUs

230 V ac+/- 4.0 %5.0 %Storage Productswith Ac-Dc MultiOutput PSUs

230 V ac and/or
115 V ac

Optional Testing
Conditions For Ac-Dc
Japanese Market

100 V ac

Dc Storage Products+/- 53 V dc+/- 1.0 V

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Table 3: Input Frequency Requirements for All Products
Supply Voltage

Frequency

100 V ac

50 Hz

115 V ac

50 Hz

230 V ac

50 Hz or 60 HzFrequency
Tolerance±1.0%22232425D) Power Meter: Power Meter(s) shall report true Root Mean Square (RMS) power and at least two of thefollowing measurement units: voltage, current and power factor. Power Meter(s) shall possess thefollowing attributes:

2627281) Calibration: The meter shall be calibrated within the past one year of the test date, by a standard
traceable to National Institute of Science and Technology (USA) or a counterpart national
metrology institute in other countries.

293031322) Crest Factor: An available current crest factor of 3 or more at its rated range value. For analyzers
that do not specify the current crest factor, the analyzer must be capable of measuring anamperage spike of at least 3 times the maximum amperage measured during any 1 secondsample.

333) Minimum Frequency Response: 3.0 kHz344) Minimum Resolution:

35i.

0.01 W for measurement values less than 10 W;

36ii.

0.1 W for measurement values from 10 W to 100 W; and37iii. 1.0 W for measurement values greater than 100 W.

38394041425) Logging: The reading rate supported by the meter shall be at least 1 set of measurements persecond, where set is defined as watts. The data averaging interval of the analyzer shall equal thereading interval. Data averaging interval is defined as the time period over which all samples
captured by the high-speed sampling electronics of the analyzer are averaged to provide themeasurement set.

43446) Measurement Accuracy: Measurement uncertainty as introduced by the instrument that measures
the input power to the product under test, including any external shunts.

4546i.

Power measurements with a value greater than or equal to 0.5 W shall be made with anuncertainty of less than or equal to 2% at the 95% confidence level.

4748ii.

Power measurements with a value less than 0.5 W shall be made with an uncertainty ofless than or equal to 0.01 W at the 95% confidence level.

49B) Temperature Sensor: The temperature sensor shall possess the following attributes:501) Logging: The sensor shall have a minimum reading rate of 4 samples per minute.

5152532) Measurement Accuracy: Temperature must be measured no more than 50 mm in front of (upwindof) the main airflow inlet of the UUT and reported by the sensor with an overall accuracy of ± 0.5°C or better.

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5 TEST CONDUCT

55
56

5.1

57
58
59
60
61

Note: EPA is aware of the development of a revised version of the SNIA Emerald specification thatincorporates mixed workloads and testing for systems with caching abilities. EPA will follow this effort toevaluate inclusion of these additions into the test method prior to the finalization.

62636465

Note: EPA is requiring that Online 2 systems submitted for ENERGY STAR qualification must contain anintegrated RAID capable storage controller. Because this differs from the SNIA taxonomy in the EmeraldSpecification, which states that Online 2 storage products are not required to contain a RAID capablecontroller, EPA has included the guidance above

6667B) The Ready Idle Test (6.3) shall be conducted over a period of 24 hours, with AVERAGE POWER1
submitted over the entire 24 hour period.

68697071

Note. EPA is replacing the approach in the SNIA Emerald specification, section 7.4.3.4, with a 24 hour
test to capture common background processes.

Guidance for Implementation of SNIA EmeraldTM Power Efficiency Measurement
Specification Version 1.0

A) Online 2 Data Center Storage products must include a RAID capable controller during all testing.

C) Storage products shipped with COMs must have all COMs disabled during the following tests:

721) SUT Conditioning Test (6.1)732) Active State Test (6.2)743) Ready State Idle Test (6.3)

7576774) Following the completion of the Ready Idle State Test, COMs shipped with the storage productshall be enabled and COM Validation Testing (6.4) shall be performed for all COMs present in theproduct.

78798081

Note: EPA is requiring that all COM functionality should be turned off during the SUT Conditioning Test,
Active State Test and Ready Idle State Test. This will create an even comparison of products at their basefunctionality, prior to the addition of extra cost capacity optimization method options which provide varying
levels of improved performance based on the usage of the product.

8283D) Network Attached Storage products that ship with Block I/O capability shall be tested under thefollowing additional requirements:

84i.

All usable Storage Devices shall be allocated to Block I/O for all testing with the exception of:85(a)Storage Devices needed to enable a minimal NAS capability in the system;

86(b)Limitations imposed by the system for maximum allowable Block I/O capacity.

87ii.

NAS functionality shall be enabled during all testing.

1The calculation of AVERAGE POWER is defined in Equation 7-3 of the SNIA EmeraldTM Power
Efficiency Measurement Specification Version 1.0

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89iii. No external NAS storage requests shall be presented to a system during testing. (NASfunctionality shall be in a Ready-Idle state).

9091

Note: EPA has provided special guidance on testing NAS systems with Block I/O capability for
qualification in Version 1.0.

92

6 TEST PROCEDURES FOR ALL PRODUCTS

93

6.1

94
95

SUT conditioning shall be performed according to SNIA EmeraldTM Power Efficiency Measurement
Specification Version 1.0: Section 7.4.1: Online SUT Conditioning Test.

96

6.2

97
98
99

Active state performance shall be measured according to SNIA EmeraldTM Power Efficiency Measurement
Specification Version 1.0: Section 7.4.2: Online Active Test; with the additional guidance in Section 5 ofthis document.

100

6.3

101
102
103

Ready Idle state performance shall be measured according to SNIA EmeraldTM Power Efficiency
Measurement Specification Version 1.0: Section 7.4.3: Online Ready Idle Test; with the additionalguidance in Section 5 of this document.

104

6.4

105
106
107

Validation of COM functionality shall be recorded according to SNIA EmeraldTM Power Efficiency
Measurement Specification Version 1.0: Section 7.4.4: Online Capacity Optimization Test; with theadditional guidance in Section 5 of this document.

108109110
111

Note: EPA would like to clarify that the COM validation testing is designed to validate existence andactivation of COMs that are present in the SUT. This test is not designed to measure the effectiveness ofCOMs in the storage product for various workloads.

SUT Conditioning Test

Active State Test

Ready Idle State Test

COM Validation Test

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