Storage Bridge Bay Specification v2.0

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"Storage Bay specification revision 2.0" Storage Bridge Bay (SBB) 是一种技术规范，专注于存储系统的架构和接口设计，特别是在数据中心和服务器环境中的应用。这个规范的版本2.0发布于2008年1月28日，主要关注如何通过标准化的方式整合和管理存储设备，以提高效率、可扩展性和互操作性。 SBB 设计的目标是提供一个灵活的框架，允许不同的存储设备（如硬盘驱动器、固态驱动器等）能够无缝地与服务器和存储系统通信。它定义了一种标准接口，使得硬件供应商可以构建兼容的存储模块，这些模块能够在多种服务器平台上工作，减少了设备间的兼容性问题和整体系统集成的复杂度。在SBB规范中，重点内容可能包括以下几个方面： 1. **接口标准**：SBB规范定义了物理接口和电气规范，确保不同供应商的存储设备能够在统一的标准下工作。这可能包括信号定义、电源需求、机械尺寸等。 2. **管理协议**：为了有效管理和监控存储设备，SBB可能规定了一套管理协议，允许系统管理员远程控制和监控存储资源的状态，包括故障检测、性能监控和设备更换等。 3. **热插拔支持**：考虑到数据中心对高可用性的要求，SBB可能支持热插拔功能，即在不关闭系统的情况下，可以安全地添加或移除存储设备，减少服务中断的风险。 4. **扩展性**：规范可能包含了扩展存储容量的方法，允许通过增加新的SBB模块来增加存储空间，而无需大规模改动现有架构。 5. **知识产权（IP）政策**：SBB工作组成员同意在特定和有限的条款与条件下，将某些知识产权授权给其他工作组成员，以促进技术的共同开发和使用。用户需要自行负责获取实施此规范所需的任何额外IP权利。 6. **责任豁免**：SBB工作组和作者明确声明，他们不对因实施该规范而导致的任何知识产权侵权责任，无论是直接还是间接的，承担责任。同时，他们也不保证实施该规范的系统不会侵犯他们或其他人的知识产权。 7. **“As Is”条款**：提供该规范时，没有任何形式的明示或暗示保证，无论是法定的还是其他的，所有保证都已明确放弃。这意味着采用SBB规范的开发者或使用者需自行承担可能的风险和后果。 Storage Bridge Bay 规范2.0是一个旨在推动存储设备标准化和互操作性的技术文档，对于理解和设计符合该标准的存储解决方案具有重要价值。通过遵循这个规范，硬件制造商和服务提供商能够创建更加灵活、高效且易于管理的存储解决方案。

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Version 2.0

Figure 6: Air Inlet and SBBMI Module Locations

2.1.4.1 Canister Materials

The canister materials are not defined by this specification with the exception of the surfaces that contact

the enclosure and EMI and ESD contact surfaces (e.g. guide rails, ejector, EMI gasket). These surfaces

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Version 2.0

MUST [4] be corrosion free and galvanically compatible to zinc finishes, including any EMI gasket

material chosen. The conductivity of the contact surfaces MUST [5] not exceed 1 mΩ when measured

using the test equipment and methodology defined in Section 2.1.4.1.1 All canister parts shall be free of

burrs and sharp edges.

It is strongly recommended that the materials selected for construction of the canister comply with

applicable hazardous materials restrictions as defined by the countries in which the product is marketed.

There are a number of materials from which canisters may be formed from that will meet this

specification’s requirements. One common material used in the industry today is precoated steel.

Precoated steel can provide EMI containment, grounding, and structural support for the electronics PCB

within the canister. Systems are typically produced from precoated zinc steels or are post plated with

nickel plate. The canister can be formed out of sheet steel that is either preplated with electro galvanic

zinc or hot dipped zinc. If zinc coating is chosen, it should be 20 to 25 g/m2 on each side and should be

finished with an anti-fingerprint treatment (AFP) for corrosion resistance. Due to the industry’s switch

away from hex-chrome based AFP treatments, the corrosion resistance and the surface conductivity of

some of these sheet metals may not have sufficient performance to effectively meet this specification’s

requirements. Therefore, a minimum corrosion and electrical conductance are defined. The tests for

corrosion and electrical conductivity are detailed below. The same test panel may be used for both tests

provided that the conductivity test is performed before the corrosion test. If the sample fails the

conductivity test, there is no point in running the corrosion test.

2.1.4.1.1 Conductivity Measurement Procedure

The surface conductivity of the base sheet metal MUST [6] be measured using a four point Loresta- EP

CP-T360 (or equivalent) meter equipped with type BSP probes. The maximum allowable impedance of

the surface MUST [7] not exceed 1 mΩ.

The Loresta BSP probes are gold plated for low resistance and spring loaded to give approximately 210

grams of force when fully depressed. The tips are rounded with a 0.37 mm radius. A mechanical fixture

can be designed to hold the two probes at a constant separation with full deflection of the probe tips to

achieve maximum force. A separation between probes of 2.5 cm minimum was found to be satisfactory

for the purpose of evaluating the AFP coating.

Current Source

- Voltage +

Resistance

Surface Resistance

Internal Resistance

Figure 7: Simple Circuit Representation of AFP Steel Using Four-point Resistance Method

The following procedure is used to measure AFP material conductivity:

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Version 2.0

1. Draw a 5 x 5 cm grid on the metal surfaces, front and back.

2. Gently wipe the surfaces using a soft dry towel or cloth to remove surface contaminants. DO NOT

USE ABRASIVES, CHEMICAL CLEANERS, or SOLVENTS.

3. Place the probe tips in the approximate center of each grid cell with the probe tips separated by a

minimum of 2.5 cm and fully depressed.

4. Allow the meter to stabilize.

5. Record the resistance in each cell.

Measurements MAY be repeated up to three times if there are inconsistencies or unexplained variations

observed. The sample passes when all of the cells have attained a reading of no more than 1 mΩ.

2.1.4.1.2 Corrosion Measurement Procedure

The following defines an acceptable test for zinc precoated steel; other surface coatings MUST [8] be

tested to an equivalent corrosion level.

If zinc precoated sheet steel is used for the canister to enclosure contact surfaces, it MUST [9] be able to

withstand a minimum of 72 hours of salt spray testing per specification ASTM B117. After a rinse of the

sample, “white rust” MUST [10] not cover more than 5% of the total area. White rust is the corrosion of the

zinc coating and will precede the onset of “red rust” (corrosion of base steel). The ASTM specification

details the specific control parameters for chamber operation and sample orientation so that the corrosion

rate is controlled. When testing precoated steel samples, the edges are sealed (either with a plastic tape

or some other type of barrier coating such as epoxy or silicone) so that there is no exposed base material

which would rust prematurely.

2.1.5 Enclosure Slot Definition

The enclosure slot for the SBB canister is defined by the mechanical interfaces that are required for the

SBB canister to function in a system. Dimensions and details not defined here are left to be defined by

the enclosure designer.

The enclosure slot MUST [11] provide the following key features:

• Accommodations to ensure smooth canister insertion and prevent damage to a canister mounted

EMI gasket (e.g., lead-ins, edge smoothing, etc.). These accommodations MAY be formed out of

plastic but MUST [12] provide for a conductive connection between the enclosure and the SBB

canister to complete the EMI and ESD management solution

• Enclosure/canister mounted EMI gasket solution which meets the requirements described in

section 2.1.6

• A slot which functions with the lever mechanism described in section 2.3

• The enclosure feature corresponding to the canister key defined in section 2.5

• The SBBMI connector system as described in section 2.5.6

• Openings in the enclosure to provide airflow as required in sections 2.2 and 4

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Version 2.0

2.2 Air Inlet and Exhaust Vent Locations

An SBB compliant enclosure MUST [16] provide airflow to the SBB canister in a manner that air will enter

the SBB canister envelope boundary through the area bounded by the air vent keepout shown in Figure

6. The SBB specification provides three air vent exit locations, air vent 1, air vent 2 and air vent 3. The

position and dimensions of the air vents relative to the SBB canister envelope are shown in Figure 5. An

SBB compliant enclosure MUST [17] provide airflow to the SBB canister in a manner that air will exit the

SBB canister envelope boundary at, at least one of the three exit air vent locations. SBB compliant

enclosures MUST [18] provide at least one exit air vent location. SBB canisters are not required to

operate with every exit air vent location. SBB canister designers may design their system to support only

one exit air vent location if desired. Further requirements related to cooling and airflow are given in

Section 4.

2.3 Lever Mechanism Requirements

The SBB canister lever mechanism comprises of a horizontal lever arrangement mounted at the top of

the SBB canister to control the insertion and extraction of the canister. The lever definition is restricted to

the critical operating dimensions to allow individual canister vendors scope for unique design in this area.

The levers may, for instance, be interchangeable components or customizable to a particular customers

requirements.

The length or number of levers is also at the vendor’s discretion and should be suitable for the insertion

force associated with the canister implementation and associated number of SBBMI modules supported (

see Section 2.3.1 and Section 2.5.6).

All supporting chassis structures MUST [19] be capable of supporting the maximum loading criteria

imposed. SBB enclosure slots MUST [20] be capable of accepting SBB canisters with dual levers.

The lever rotates through approximately 60 degrees from the open position to the closed position. In the

open position the lever is aligned such that the cam surfaces do not extend beyond the profile of the SBB

canister and the SBB canister may be inserted into the enclosure. In the closed position the lever is

aligned such that the cam surfaces extend into the structure adjacent to the SBB canister, retaining the

fully inserted SBB canister in the enclosure. It is RECOMMENDED that a stop feature is provided for the

lever mechanism to prevent over rotation.

Figure 9, Figure 10, and Figure 11 include a recommended reference design for a camming lever that

would provide the optimum canister insertion and extraction when used with the specified enclosure

interface dimensions.

2.3.1 Force Criteria

The lever mechanism is required to overcome the multiple pin insertion force of the SBBMI connector

system, plus the force required to compress both the canister and enclosure EMI gasket. The force

requirement will vary according to the EMI implementation from each enclosure provider but is estimated

to be around 270N for a full implementation containing SBBMI modules M1 to M13.

2.3.2 Mechanism Definition

Insertion of the SBB canister into the enclosure is controlled by the lever mechanism. The canister with

the levers in the open position is inserted into the enclosure. The lever primary cam makes first contact

with the enclosure structure and starts the rotation of the lever around its pivot point. This engages the

secondary cam into the enclosure feature. Manual pressure on the levers provides the mechanical

advantage for the cam to act on the enclosure feature and move the canister fully into the enclosure.

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Storage Bridge Bay Specification v2.0

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