CN102510344B - Rack server system - Google Patents
Rack server system Download PDFInfo
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- CN102510344B CN102510344B CN201110376524.7A CN201110376524A CN102510344B CN 102510344 B CN102510344 B CN 102510344B CN 201110376524 A CN201110376524 A CN 201110376524A CN 102510344 B CN102510344 B CN 102510344B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/04—Network management architectures or arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/34—Signalling channels for network management communication
- H04L41/344—Out-of-band transfers
Abstract
The invention relates to a rack server system. The rack server system comprises a plurality of server nodes, a plurality of module management controllers (MMC), a rack management controller (RMC), a power source module and a fan module; the MMCs are respectively connected with each server node of one group of server nodes so as to communicate with the server nodes; one group of the server nodes comprises one or more of a plurality of the server nodes, wherein each MMC comprises a plurality of interface units and is used for communicating with the server nodes by using one or more specific interface unit according to the communication interface type supported by the server nodes. According to the rack server system disclosed by the embodiment of the invention, the quantity of server node types and management methods supported by the entire system is large so that the requirement of users for different types of server nodes and the management methods is met.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of rack server system.
Background technology
The way to manage of existing high density type rack server has a lot, and for example some only provides fan management, and some is that multiple rack servers are combined into rack, but there is no the way to manage of unified cabinet-level server.
Rack server is taking rack as entirety, the server of unified power supply, fan cooling and switching equipment is provided, in rack, multiple server nodes can be installed, can configure many services device node, owing to existing plurality of devices to integrate, and there is highdensity server node.
Fig. 1 is a kind of schematic diagram of existing rack server, complete machine cabinet is supported 1U server node, whole rack uses unified power supply and radiating treatment, each joint server is supported warm connection function, server node has single board management controller (Baseboard Management Controller, BMC).
Use IMM standalone snap-in, IMM uses netting twine to be connected with all fans, it after rack, is a fan wall, formed by multiple blower modules, fan control board of each fan belt, can can utilize network service with IMM administrative unit, fan control board and IMM realize fan speed-regulating management, fan monitoring and fan failure management by network service.
Power module band control board, can realize network service with IMM administrative unit, and power board and IMM realize mains switch management, Power Supply Monitoring and power failure management by network service.
IMM administrative unit is used RS485 bus to be connected with Servers-all node, completes power-on and power-off and the reset operation of node by RS485 bus communication, also can communicate by letter by network the BMC outband management function of the standard that realizes with the BMC of Servers-all node.
The way to manage of prior art is only supported the server node of BMC and is only supported specific way to manage, deposit the type deficiency of server node and the problem of way to manage underaction supported, cannot meet the demand of user to dissimilar server node and way to manage.
Summary of the invention
The embodiment of the present invention provides a kind of rack server system, and the server node type deficiency of support and the problem of way to manage underaction that exist for solving prior art, to meet the demand of user to dissimilar server node and way to manage.
The embodiment of the present invention provides a kind of rack server system, and described rack server system comprises:
Multiple server nodes, multiple module management controller MMC, rack Management Controller RMC, power module and blower module;
Each described MMC is connected that with one group of each server node of server node described server node is communicated respectively, and described one group of server node comprises one or more in described multiple server node; Wherein, described MMC comprises multiple interface units, and described MMC is for using specific one or more interface units and described server node to communicate according to the communication interface type of described server node support;
Described RMC is connected with each described MMC, described power module and described blower module, to realize communicating by letter between each described MMC, described power module and described blower module;
By above-mentioned connected mode, make the management switch that described rack server system support need to manage rack server system to realize the management to described power module and described blower module by described RMC by the mode being connected with described RMC, and realize the management to each described server node by described RMC and described MMC; And make described rack server system support described management switch to realize the management to described server node by the mode being connected with described server node, and by described server node, described MMC, described RMC is to realize the management to described blower module and described power module.
The rack server system of the embodiment of the present invention is managed multiple server nodes by MMC, and MMC comprises multiple interface units, can (adopt certain communication interface if any the node of BMC according to the interface type of server node, adopt another kind of communication interface without the node of BMC) come to communicate with server node with specific one or more interface units, thus realize the support to dissimilar node server.Simultaneously, embodiment of the present invention MMC and multiple server communication, the framework that RMC is connected with power module, blower module and multiple MMC, can make to manage switch and both can realize the unified management to rack by the mode being connected with RMC, also can be by meeting the mode being connected with each server node, server node is managed, and realize the management to power module, blower module by MMC, RMC.By said method, server node type and way to manage that whole system is supported are more, have met the demand of user to dissimilar server node and way to manage.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of existing rack server;
Fig. 2 is the schematic diagram of embodiment of the present invention rack server system;
Fig. 3 is the schematic diagram of power supply control in embodiment of the present invention rack server system;
Fig. 4 is the schematic diagram of radiator control in embodiment of the present invention rack server system;
Fig. 5 is the schematic diagram of another rack server system of the embodiment of the present invention;
Fig. 6 is the control schematic diagram of server node in another rack server system of the embodiment of the present invention;
Fig. 7 is the embodiment of the present invention schematic diagram of a rack server system again.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The rack server system of the embodiment of the present invention, can manage the work of Servers-all node in rack (being hereinafter also called for short " server " or " node ") and other equipment, for example complete machine cabinet disposes rack Management Controller (Rack Management Controller, RMC), complete machine cabinet comprises 10 machine frames, in each machine frame, can configure 8 half-breadth server nodes or 4 overall with server nodes, and in each machine frame, configure a module management controller (Module Management Controller, MMC) manage the server node in each machine frame.
MMC, for communicating by letter with server node, has temperature data and the power consumption data controlling and obtain server node; RMC is used for regulating according to described temperature data the heat dissipation capacity of blower module, and adjusts power module power supply according to described power consumption data; According to MMC, control signal that forward or that directly receive powers on or lower electric treatment server node.RMC can realize all power module power supplies and the unified management processing of fan cooling thus; RMC can realize by MMC temperature information, power consumption information, assets information, rack resource and the server node administration of server node in addition.User also can utilize the BMC administration module of server node to realize independently outband management function of server node by switch.
RMC receives the power consumption information of Servers-all node by MMC; RMC is according to all power consumption information, judge according to power consumption control principle, if complete machine cabinet power consumption is greater than default definite value, carry out node power consumption control operation, if be less than user preset definite value and now electrical power consumed be greater than existing complete machine cabinet power consumption, carry out power module sleep operation, otherwise continue policer operation.
Configurable 80 the half-breadth server nodes of complete machine cabinet or 40 overall with server nodes like this, can place 6 switches in the middle of rack in addition, and each server node is an independent computing node.And each server node can be with a single board management controller (Baseboard Management Controller, BMC), can realize thus independently outband management function.
Fig. 2 is the schematic diagram of embodiment of the present invention rack server system, and as shown in the figure, the present embodiment comprises RMC11, MMC12, server node 13, power module 14 and blower module 15.
MMC12 comprises: control unit, logic control element and memory cell.Concrete, embodiment of the present invention rack server system also comprises backboard, each server node 13 is connected with backboard, then is connected with described MMC by the printed circuit board (PCB) on backboard (Print Circuit Board, PCB) cabling.MMC12 can be connected on backboard by connector, is connected with server node 13 or RMC11 by backboard PCB cabling, can certainly be connected with server node 13 or RMC11 by the mode of front card.
Similar, RMC11 also can be connected with MMC12 and blower module 14 by the mode of cable, and concrete cable mode can be (please provide).RMC11 is connected with backboard by connector, then is connected with power module 14 by the PCB cabling on backboard.
Adopt the mode of backboard can support signal at a high speed, disturb less; If connected with cable, disturbing can be more, and effect can be almost.
Adopt the mode of PCB backboard to communicate by letter, in the time that the signal frequency of communication is high, the communication distance between 2 can not be oversize, distance signal volume interference, poor signal quality, if used cable communication mode can support long haul communication, as ethernet communication mode.
MMC12 communicates by point-to-point intercommunicating mode and server node 13, point-to-point intercommunication does not need to know that partner address just may communicate by letter (unlike IP communication mode, need to know the address of communicating pair), such advantage is because the server node quantity in rack server is many, maximum can be supported 80 nodes, the IP address of each node is dynamically to generate, and can be solved under the prerequisite of not knowing the other side IP address and also can be communicated operation to server node by the point-to-point intercommunication of MMC and server node.
Point-to-point intercommunicating mode comprises: carry out point-to-point intercommunication by Intelligent Platform Management Bus (Intelligent Platform Management Bus, IPMB) communication mode; Or carry out point-to-point intercommunication by serial communication mode; Or carry out point-to-point intercommunication by general input/output port GPIO communication mode.
RMC11 comprises: control unit, crosspoint, logic control element and memory cell.RMC11 is connected with each MMC12, power module 14 and blower module 15, to realize communicating by letter between each MMC12, power module 14 and blower module 15; By above-mentioned connected mode, make the management switch that rack server system support need to manage rack server system to realize the management to power module 14 and blower module 15 by RMC11 by the mode being connected with RMC11, and realize the management to each server node 13 by RMC11 and MMC12; And make rack server system support management switch realize the management to server node 13 by the mode being connected with server node 13, and by server node 13, MMC11, RMC15 is to realize the management to blower module 14 and power module 15.
The rack server system management network port that goes out to go out, user can utilize RMC11 can realize with communicating by letter of server node the management function of server by switch 16, for example realize server node power-on and power-off operation by GPIO, the temperature information that MMC12 can desampler node directly sends, warning message and assets information, RMC11 is by the ambient temperature of rack, realize the heat radiation of rack server system, power module 14 power supplies that RMC11 can realize complete machine cabinet by the overall power consumption of each server node 13 regulate, realize the power consumption design of automatic governing.
Power module 14 comprises control unit and power conversion unit.Fig. 3 is the schematic diagram of power module control in embodiment of the present invention rack server system, as shown in the figure, taking 8 power module PS as example, RMC11 and power module 14 use same power module frame, between RMC11 and power module 14, use the backboard of power module frame to be connected, RMC11 is connected with power module 14 by I2CLian road, thereby realizes PMBUS protocol communication, and RMC11 carries out power module management function by PMBUS agreement to 8 power modules 14.
Give 14 points of I2C addresses of each power module (A0-A2 carries out unified addressing by three address wires) by power module frame backboard, RMC11 is carried out PMBUS protocol communication and is read power module FRU information by I2C address and each power module.Can manage all power modules 14 by PMBUS agreement RMC11 thus, realize switch and the power managed of power module 14, each power module 14 also has PS_OK and power module signal in place with the backboard of power module frame, RMC11 connects by the signal of power module frame backboard, can realize the in place and power module plug identification management of Voltage-output, the power module of all power modules 14, RMC11 can realize fault location and the fault management capability of power module.
Fig. 4 is the schematic diagram of embodiment of the present invention rack server system fan module controls, as shown in the figure, heat radiation is made up of 6-8 blower module, each blower module 15 is made up of two fan units 151 and a control circuit 150, and the control signal that control circuit 150 receives RMC11 generates driving signal; Fan unit 151 drives Signal Regulation rotating speed according to receiving, and is the server node heat radiation of correspondence position.Control circuit 150 has a trouble light and a RJ45 interface, a control circuit 150 can be controlled two desk fans 151, control circuit 150 uses netting twine to be connected by RJ45 interface with RMC11, the particular requirement that is connected with of blower module 15 and RMC11, by rack from top to bottom blower module 15 with correspond respectively to No. 1-8 of RMC11 fan management port being connected of RMC11, RMC realizes blower module 15 to radiating control that should region by the position corresponding relation to particular port and fan frame.The layout blower module of blower module, after rack server, from top to bottom, is made up of the rear back side fan wall of rack 6-8 blower module, each blower module is made up of two big fans.
RMC carries out speed governing by pwm signal to the fan of a blower module, and each fan has the fan rotating speed signals of oneself to carry out rotation speed of the fan detection, and each fan provides independently signal in place to carry out the in place of fan and plug detection management.Fan failure lamp of each fan frame band, in the time that RMC detects fan failure, operates the normal bright expression of fan failure lamp by RMC, until fan failure recovers just to close lamp.The heat radiation strategy of rack is to carry out the speed governing to fan by the veneer temperature to server node, when the server veneer temperature excess temperature of certain node, server node BMC can report RMC veneer temperature to occur alarm, and RMC is undertaken corresponding fan frame to carry out speed governing operation by detecting current server node region.
Again as shown in Figure 2, can integrated switch chip in RMC11, front panel goes out 10 network interfaces on the MMC12 in the corresponding rack of management network ports difference, the corresponding RMC11 management network port of each MMC12, distinguish corresponding 1-10 network interface from top to bottom, between RMC11 and MMC12, use network service to carry out equipment control control.
For example, in rack, there are 10 machine frames, each machine frame can configure 8 half-breadths without the server node of BMC administration module or 4 overall withs the server node without BMC administration module, a MMC12 of each machine frame configuration, Servers-all node 13 in frame and MMC12 are inserted on the backboard of machine frame, MMC12 and server 13 use serial ports to communicate and use GPIO mouth to carry out the power-on and power-off management of server, the integrated LSW chip of RMC11 carries out port locations operation, judge the machine frame position at server node 13 places by the position relationship of port and MMC12, RMC11 and MMC12 carry out data communication with UDP network communication protocol, inside UDP message, encapsulate again the transmitting-receiving operation that internal communication protocol using manages data command, by the signal in place of the server node 13 on subrack backboard, MMC12 can detect the in place and Plug Action of the Servers-all in machine frame, and report RMC12 to carry out uniform server node administration.
Fig. 5 is the schematic diagram of another rack server system of the embodiment of the present invention, and as shown in the figure, the present embodiment comprises RMC11, MMC12, server node 13, power module 14, blower module 15 and BMC18.
The difference of the present embodiment and a upper embodiment has BMC18 exactly on each server node 13, and in the present embodiment, the control of power module 14 and blower module 15 is same as the previously described embodiments.
MMC12 judges for inserting according to server node 13 hardware signal producing after rack whether server node 13 contains BMC18, and in the time that server node contains BMC18, the interface and the server node 13 that adopt BMC18 to support communicate.
As shown in the figure, because be with BMC18 on server node 13, the rack server management network port that goes out to go out, user can utilize RMC11 can communicate by letter to realize with the BMC19 of server node 13 all outband managements of server node 13 by switch, such as server node 13 power-on and power-off operations, warning information report with assets information and report etc., RMC11 communicates by letter with BMC18 by MMC12, the temperature information of BMC18 acquisition server node 13 and power consumption information, and report RMC11; RMC can realize automatic blower module heat radiation 15 by these information and adjust, and realizes heat radiation, and power module 14 power supplies that RMC11 can realize complete machine cabinet by the overall power consumption of each server node 13 regulate, and realize automatic governing power consumption.
Fig. 6 is the control schematic diagram of server node in another rack server system of the embodiment of the present invention, as shown in the figure, the integrated switch chip of RMC11, front panel goes out 10 network interfaces on the MMC12 in the corresponding rack of management network ports difference, the corresponding RMC11 management network port of each MMC12, distinguish corresponding 1-10 network interface from top to bottom, between RMC11 and MMC12, use network service to carry out equipment control.
For example, in rack, there are 10 machine frames, each machine frame can configure 8 half-breadth server nodes or 4 overall with server nodes, a MMC12 of each machine frame configuration, Servers-all node 13 in frame and MMC12 are inserted on the backboard of machine frame, and MMC12 is connected and is used IPMB to communicate by letter by I2C with BMC18, and each machine frame divides upper and lower Liang Ge district, use respectively the IPMB on two tunnels to become main and standby relation, a machine frame IPMB connection on totally 4 tunnels.RMC11 communicates to realize by MMC12 intermediate layer and BMC18 server node 13 is managed, the integrated LSW chip of RMC11 carries out port locations operation, judge the machine frame position at server node 13 places by the position relationship of port and MMC12, RMC11 and MMC12 carry out data communication with UDP network communication protocol, inside UDP message, encapsulate again the transmitting-receiving operation that internal communication protocol using manages data command, by the signal in place of the server node on subrack backboard, MMC can detect the in place and Plug Action of the Servers-all in machine frame, and report RMC to carry out uniform server node administration.
This shows, the present embodiment has BMC, and a upper embodiment does not have BMC, as being while supporting the plate of BMC when detecting, can communicate with the interface (as IPMB) that BMC plate is supported; If while support, can communicate with serial ports etc.
Above-mentioned two embodiment are to server node centralization control, so some management are all completed by RMC, user only need be connected and just can complete all management functions with the management network port of RMC, and server node support has BMC and without BMC administrative unit.
Another mode is the control of the flattening to server node, Fig. 7 is the embodiment of the present invention schematic diagram of a rack server system again, as shown in the figure, the present embodiment comprises RMC11, MMC12, server node 13, power module 14, blower module 15 and BMC18.
The difference of the present embodiment and a upper embodiment is, rack server uses the RMC of rack and each Node B MC at same management plane, and user can realize by the BMC of each node the control and management of server node.The control of power module 14 and blower module 15 is identical with a upper embodiment.
Server node 13 is with BMC18, RMC11 is not connected and manages with switch 16, user only need be concerned about all outband managements of server node 13, can cross server node BMC18 and manage each station server node 13 independently, can realize all outband management functions, as server node 13 power-on and power-off operations, warning information reports with assets information and reports etc., RMC11 communicates by letter with BMC18 by MMC12, the temperature information that RMC11 reports by BMC18 can be realized the fan unit adjustment of rotational speed of automatic blower module 15, realize machine heat radiation, power module 14 power supplies that the overall power consumption of the power consumption that RMC11 reports by each server node 13 can realize complete machine cabinet regulate, realize automatic governing power consumption.
Because user is only concerned about server node 13 and manages, user can directly couple together the BMC18 of all server nodes 13 by switch 16, temperature data and the power consumption data of BMC18 reception server node 13, and by I2C, temperature data and power consumption data are sent to MMC12, then be transmitted to RMC.And blower module 15 and power module 14 are still unified to control by RMC11, in the time that blower module 15 and power module 14 break down, the fault message of the warning message of server node 13 and power module 15 or blower module 14 is sent to external switch 16 by BMC18, notifies user to change power module 15 or blower module 14.
Embodiment of the present invention rack server system has RMC, and RMC provides respectively I2C interface to carry out power supply management, provide control signal to carry out blower module control, provide network interface and MMC to carry out server node control, each management interface and function all have independence, there is not coupling, can realize the unified management effect to complete machine cabinet resource by RMC.
And support many services device node, include the server node without BMC.Because there is MMC, MMC externally can provide IPMB, serial ports, GPIO and PCIE interface, meet all external interfaces of management server needs, having BMC to take server node can use IPMB to connect, can use serial ports and GPIO interface without BMC server node, the middle compatible and interface adaptation that realizes RMC and server node by MMC, makes RMC can manage many services device node, the management interface of RMC is unified, and rack is supported many services device node.
In addition, the RMC of the embodiment of the present invention externally provides management network port, has intercommunication at interior of equipment cabinet and Servers-all Node B MC, and all users can be by all resources of management port management rack of RMC.If user want server node be used as each oneself independently server manage, server joint is as long as be with BMC just can support, go out a management network port by the every server node of BMC, all be connected in user's supervising the network, the management network port of RMC end can not connect, the power module of rack and heat radiation are managed by RMC, when power module with fan breaks down or when alarm, RMC can send to switch to inform user by BMC network interface warning information.Due to the compatible multiple management framework of this rack management system, can be with managing according to own existing management framework, without changing existing management system.
The rack server system of the embodiment of the present invention is managed multiple server nodes by MMC, and MMC comprises multiple interface units, can (adopt certain communication interface if any the node of BMC according to the interface type of server node, adopt another kind of communication interface without the node of BMC) come to communicate with server node with specific one or more interface units, thus realize the support to dissimilar node server.Simultaneously, embodiment of the present invention MMC and multiple server communication, the framework that RMC is connected with power module, blower module and multiple MMC, can make to manage switch and both can realize the unified management to rack by the mode being connected with RMC, also can be by meeting the mode being connected with each server node, server node is managed, and realize the management to power module, blower module by MMC, RMC.By said method, server node type and way to manage that whole system is supported are more, have met the demand of user to dissimilar server node and way to manage.
Professional should further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software is clearly described, composition and the step of each example described according to function in the above description in general manner.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can realize described function with distinct methods to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can use hardware, processor to carry out, or the combination of the two is implemented.Software module can be placed in the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a rack server system, is characterized in that, described rack server system comprises:
Multiple server nodes, multiple module management controller MMC, rack Management Controller RMC, power module and blower module;
Each described MMC is connected that with one group of each server node of server node described server node is communicated respectively, and described one group of server node comprises one or more in described multiple server node; Wherein, described MMC comprises multiple interface units, and described MMC is for using specific one or more interface units and described server node to communicate according to the communication interface type of described server node support;
Described RMC is connected with each described MMC, described power module and described blower module, to realize communicating by letter between each described MMC, described power module and described blower module;
By above-mentioned connected mode, make the management switch that described rack server system support need to manage rack server system to realize the management to described power module and described blower module by described RMC by the mode being connected with described RMC, and realize the management to each described server node by described RMC and described MMC; And make described rack server system support described management switch to realize the management to described server node by the mode being connected with described server node, and by described server node, described MMC, described RMC is to realize the management to described blower module and described power module;
Described MMC communicates by point-to-point intercommunicating mode and described server node, and wherein, described point-to-point intercommunicating mode comprises:
Carry out point-to-point intercommunication by Intelligent Platform Management Bus IPMB communication mode; Or,
Carry out point-to-point intercommunication by serial communication mode; Or,
Carry out point-to-point intercommunication by general input/output port GPIO communication mode;
Described MMC specifically for, insert according to described server node the hardware signal producing after described rack and judge whether described server node contains single board management controller BMC, in the time that described server node contains described BMC, the interface and the described server node that adopt described BMC to support communicate.
2. rack server system as claimed in claim 1, is characterized in that:
Described system also comprises backboard, and each described server node is connected with described backboard, then is connected with described MMC by the printing board PCB cabling on described backboard.
3. rack server system as claimed in claim 2, is characterized in that:
Described MMC is connected with described backboard in the mode of back card/back board, is connected with described server node by the described PCB cabling on described backboard.
4. the rack server system as described in as arbitrary in claim 1-3, is characterized in that:
Described RMC is connected with described MMC and described blower module by the mode of cable.
5. rack server system as claimed in claim 2 or claim 3, is characterized in that:
Described RMC is connected with described backboard by connector, then is connected with described power module by the PCB cabling on described backboard.
6. the rack server system as described in as arbitrary in claim 1-3, is characterized in that:
Described MMC is connected with described RMC by netting twine.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110376524.7A CN102510344B (en) | 2011-11-23 | 2011-11-23 | Rack server system |
| PCT/CN2012/078699 WO2013075511A1 (en) | 2011-11-23 | 2012-07-16 | Rack server system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110376524.7A CN102510344B (en) | 2011-11-23 | 2011-11-23 | Rack server system |
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| CN102510344A CN102510344A (en) | 2012-06-20 |
| CN102510344B true CN102510344B (en) | 2014-11-05 |
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