CN111237234A - A system and method for adjusting fan control strategy according to the height of fan backplane - Google Patents

Abstract

The invention provides a system for adjusting a fan control strategy according to the height of a fan backboard, wherein a fan backboard height receiving end of a BMC is connected with a fan backboard height sending end of a first CPLD, a control signal sending end of the BMC is connected with a second CPLD control signal receiving end through a first inter-board connector and a second inter-board connector, the second CPLD determines a first fan rotating speed control strategy corresponding to the height of a first fan board according to a control signal sent by the BMC, the control sending end of the second CPLD is connected with the control signal receiving end of the first fan through a first fan connector and controls the first fan according to the first fan rotating speed control strategy, the invention also provides a method for adjusting the fan control strategy according to the height of the fan backboard, and the problem that the control of the fan cannot be flexibly adjusted according to the height of the fan backboard due to the existing server fan control method is effectively solved, the control efficiency of the server fan system is improved.

Description

A system and method for adjusting fan control strategy according to the height of fan backplane

technical field

The present invention relates to the field of server fan control systems, in particular to a system and method for adjusting a fan control strategy according to the height of a fan backplane.

Background technique

The CPU frequency of today's servers is increasing day by day, and the role of fans in server heat dissipation is becoming more and more important. The role of server fans is to speed up the flow of air on the surface of the heat sink, so as to improve the heat exchange speed between the heat sink and the air. As one of the two important components of the air-cooled radiator, the performance of the fan often plays a decisive role in the effect and service life of the server radiator.

The fan speed is controlled by PWM (Pulse Width Modulation). Specifically, the fan speed is controlled according to the PWM duty cycle. Since most CPUs nowadays have power saving functions, when the CPU is idle, the CPU frequency If the temperature is lowered, the CPU temperature will decrease accordingly. Combined with the PWM fan control, the speed can be reduced to only a few hundred revolutions or even 0 revolutions, and the relative fan noise is very low. When the CPU load increases, the temperature increases, and the PWM fan will control the speed according to the temperature to achieve an effective heat dissipation effect, and the temperature sensor of the PWM fan is on the motherboard.

One of the existing fan control methods is that the BMC can provide PWM to the fan only through I2C, and can also obtain the fan speed and control the fan speed according to the system temperature to achieve cooling requirements; the other is that the BMC provides the fan through CPLD. PWM is sent to the fan, and at the same time, the CPLD obtains the fan speed and sends it to the BMC. The BMC and CPLD implement redundant control. When the BMC fails, the CPLD can control the fan independently to ensure the normal operation of the fan control system. However, there are two fan control methods. It can only be applied to the fan backplane of a specific height, and cannot be flexibly adjusted according to the height of the fan backplane, such as 1U, 2U, etc., which is not conducive to improving the control efficiency of the server fan system and expanding the application scenarios.

SUMMARY OF THE INVENTION

In order to solve the problems existing in the prior art, the present invention innovatively proposes a system and method for adjusting the fan control strategy according to the height of the fan backplane, which effectively solves the problem that the existing server fan control method cannot be applied to fan backplanes of different heights. It effectively improves the control efficiency of the server fan system and expands the application scenarios.

A first aspect of the present invention provides a system for adjusting a fan control strategy according to the height of a fan backplane, comprising: a mainboard and a first fan backplane, the mainboard includes a BMC, a first CPLD, and a first inter-board connector, the first A fan backplane includes a second CPLD, a second board-to-board connector, and a first fan connector. The fan backplane height identification end of the first CPLD is connected to the first board-to-board connector and the second board-to-board connector through the first board-to-board connector and the second board-to-board connector. The fan backplane height sending end of the two CPLDs is connected, the fan backplane height receiving end of the BMC is connected to the fan backplane height sending end of the first CPLD, and the control signal sending end of the BMC is connected through the first inter-board connector and The second inter-board connector is connected to the second CPLD control signal receiving end. The second CPLD determines the first fan speed control strategy corresponding to the height of the first fan backplane according to the control signal sent by the BMC. The control sending end is connected with the control signal receiving end of the first fan through the first fan connector, and controls the first fan according to the first fan speed control strategy.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the height of the first fan backplane is 1U or 2U.

In combination with the first aspect, in a second possible implementation manner of the first aspect, when the total height of the fan backplane of the fan control system is 3U, it also includes a second fan backplane, wherein the height of the first fan backplane is 1U, The height of the second fan backplane is 2U, or the height of the first fan backplane is 2U, and the height of the second fan backplane is 1U; the first fan backplane further includes a third inter-board connector, and the second fan backplane The board includes a third CPLD, a fourth inter-board connector, and a second fan connector. The second fan backplane is connected to the second fan backplane through the third and fourth inter-board connectors. The fan backplane height identification end of the third CPLD is connected to the fan backplane height sending end of the second CPLD all the way through the third inter-board connector and the fourth inter-board connector, and the control sending end of the third CPLD passes through the second The fan connector is connected to the control signal receiving end of the second fan, the fan backplane height identification end of the third CPLD is connected to the first input end of the AND door, and the fan backplane height identification end of the second CPLD The other way is connected with the second input end of the AND gate, and the output end of the AND gate is connected with the fan backplane height identification end of the first CPLD of the main board, and the control signal transmission end of the BMC passes through the third inter-board connector and the third The four-board connector is connected to the third CPLD control signal receiving end. The third CPLD determines the second fan speed control strategy corresponding to the height of the second fan backplane according to the control signal sent by the BMC. The control of the third CPLD The sending end is connected to the control signal receiving end of the second fan through the second fan connector, and controls the second fan according to the second fan speed control strategy.

The second aspect of the present invention provides a method for adjusting a fan control strategy according to the height of the fan backplane, which is implemented on the basis of the system for adjusting the fan control strategy according to the height of the fan backplane in the first aspect of the present invention, including:

The BMC determines the height of the fan backplane by reading the height data of the fan backplane height sender of the first CPLD, and sends the corresponding first fan control command according to the height of the fan backplane;

After receiving the first fan control instruction from the BMC, the second CPLD determines the first fan speed control strategy according to the height of the first fan backplane, generates the first fan control signal PWM according to the first fan speed control strategy, and reads the first fan speed.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the BMC determines the height of the first fan backplane by reading the level of the level signal at the fan backplane height sending end of the first CPLD.

Further, when the total height of the fan backplane of the fan control system is 3U, the fan backplane height identification signal of the second CPLD in the first fan backplane and the fan backplane height of the third CPLD in the second fan backplane are combined. After the identification signal is ANDed by the AND gate logic circuit, it sends the fan backplane height identification terminal of the first CPLD. The BMC reads the height data of the fan backplane height sender of the first CPLD, determines the fan backplane height 3U, and sends the corresponding first The fan control command is sent to the second CPLD, and the corresponding second fan control command is sent to the third CPLD;

After receiving the first fan control instruction from the BMC, the second CPLD determines the first fan speed control strategy according to the height of the first fan backplane, generates the first fan control signal PWM according to the first fan speed control strategy, and reads the first fan After receiving the second fan control instruction from the BMC, the third CPLD determines the second fan speed control strategy according to the height of the second fan backplane, and generates the second fan control signal PWM according to the second fan speed control strategy, and reads The speed of the second fan.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the height of the first fan backplane is 1U or 2U.

In combination with the second aspect, in a third possible implementation manner of the second aspect, the height of the backplane of the first fan is 1U, the height of the backplane of the second fan is 2U, or the height of the backplane of the first fan is 2U, and the height of the backplane of the second fan is 2U. The board height is 1U.

The technical scheme adopted in the present invention includes the following technical effects:

1. The present invention effectively solves the problem that the fan control cannot be flexibly adjusted according to the height of the fan backplane due to the existing server fan control method, effectively improves the control efficiency of the server fan system, and expands application scenarios.

2. In the present invention, the 3U fan backplane can be realized by connecting a 1U fan backplane and a 2U fan backplane in series. Two fan backplanes with different heights share a mainboard, which saves the use of the mainboard on the one hand, and improves the fan backplane on the other hand. Utilize efficiency and expand the scope of use.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, On the premise of no creative work, other drawings can also be obtained from these drawings.

FIG. 1 is a schematic structural diagram of a system of Example 1 in the solution of the present invention;

Fig. 2 is another structural schematic diagram of the system of Example 1 in the solution of the present invention;

Fig. 3 is a schematic flow chart of the method of Embodiment 2 in the solution of the present invention;

FIG. 4 is another schematic flow chart of the method of Example 4 in the scheme of the present invention.

Detailed ways

In order to clearly illustrate the technical features of the solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted from the present invention to avoid unnecessarily limiting the present invention.

Example 1

As shown in FIG. 1-FIG. 2, the present invention provides a system for adjusting a fan control strategy according to the height of the fan backplane, including: a mainboard 1 and a first fan backplane 2, the mainboard 1 includes a BMC11, a first CPLD12, a first The board-to-board connector 13, the first fan backplane 2 includes a second CPLD 21, a second board-to-board connector 22, and a first fan connector 23, and the fan backplane height identification end of the first CPLD 12 passes through the first board-to-board connector 13 And the second board-to-board connector 22 is connected with the fan backplane height sending end of the second CPLD21, the fan backplane height receiving end of the BMC11 is connected with the fan backplane height sending end of the first CPLD12, and the control signal sending end of the BMC11 passes through the An inter-board connector 13 and a second inter-board connector 23 are connected to the control signal receiving end of the second CPLD 21 , and the second CPLD 21 determines the first fan speed control strategy corresponding to the height of the first fan backplane 2 according to the control signal sent by the BMC 11 , the control sending end of the second CPLD 21 is connected to the control signal receiving end of the first fan 41 through the first fan connector 23 , and controls the first fan 41 according to the first fan speed control strategy.

The height of the first fan backplane 2 is 1U or 2U. The second CPLD21 is provided with a one-to-one fan speed control strategy according to the height of the fan backplane. If the height of the fan backplane is 1U, it corresponds to the first fan speed control strategy. If the height of the fan backplane is 2U, it corresponds to the second The fan speed control strategy, wherein the first fan speed control strategy and the second fan speed control strategy may both exist in the form of tables. The second CPLD 21 determines the height of the first fan backplane 2 according to the first control instruction sent by the BMC 11 , and then determines a corresponding fan speed control strategy according to the height of the first fan backplane 2 .

As shown in FIG. 2, when the total height of the fan backplane of the fan control system is 3U, it also includes a second fan backplane 3, wherein the height of the first fan backplane 2 is 1U, and the height of the second fan backplane 3 is 2U. Or the height of the first fan backplane 2 is 2U, and the height of the second fan backplane 3 is 1U; the first fan backplane 2 further includes a third inter-board connector 24, and the second fan backplane 3 includes a third CPLD31, a fourth The inter-board connector 32, the second fan connector 33, the second fan backplane 3 is connected to the second fan backplane 3 through the third inter-board connector 24 and the fourth inter-board connector 32, and the fan backplane of the third CPLD31 is connected. The board height identification terminal is connected to the fan backplane height transmitting terminal of the second CPLD 21 through the third inter-board connector 24 and the fourth inter-board connector 32, and the control transmitting terminal of the third CPLD 31 is connected to the second CPLD 21 through the second fan connector 33. The control signal receiving end of the two fans 42 is connected, the other way of the fan backplane height identification end of the third CPLD31 is connected to the first input end of the AND door 5, and the other way of the fan backplane height identification end of the second CPLD31 is connected to the AND door 5. The second input terminal is connected, and the output terminal of the AND gate 5 is connected to the fan backplane height identification terminal of the first CPLD11 of the main board 1 . The control signal sending end of the BMC11 is connected to the control signal receiving end of the third CPLD31 through the third inter-board connector 24 and the fourth inter-board connector 32. The third CPLD31 determines the height of the second fan backplane 3 according to the control signal sent by the BMC11 Corresponding to the second fan speed control strategy, the control sending end of the third CPLD 31 is connected to the control signal receiving end of the second fan 42 through the second fan connector 33 , and controls the second fan 42 according to the second fan speed control strategy.

The second CPLD 21 and the third CPLD 31 are both provided with a fan speed control strategy corresponding to the height of the fan backplane. If the height of the fan backplane is 1U, it corresponds to the first fan speed control strategy. If it is the height of the fan backplane If it is 2U, it corresponds to the second fan speed control strategy, wherein the first fan speed control strategy and the second fan speed control strategy may exist in the form of tables. The second CPLD 21 determines the height of the first fan backplane 2 according to the first control instruction sent by the BMC 11 , and then determines a corresponding fan speed control strategy according to the height of the first fan backplane 2 . The third CPLD 31 determines the height of the second fan backplane 3 according to the second control instruction sent by the BMC 11 , and then determines the corresponding fan speed control strategy according to the height of the second fan backplane 3 .

Select 3 GPIO interfaces (General-purpose input/out put, general-purpose input and output interfaces) (FAN_BOARD_ID0, FAN_BOARD_ID1 and FAN_BOARD_ID2) in the first CPLD12 as the height identification code of the fan backplane. In this solution, the first CPLD12 of the main board 1 These three GPIOs need to be set to the internal high level. When BMC11 reads the level of the first CPLD3 GPIO interfaces through the I2C bus (I2C_0), the high level is set to 1, and the low level is set to 0. If the read level value is 111, it means that the first fan backplane 2 has not been installed, or the first fan backplane 2 is faulty; if the read level value is 110, it means the first fan backplane The height of 2 is 1U; if the read level value is 101, it means that the height of the first fan backplane 2 is 2U; if the read level value is 100, it means that the height of the first fan backplane 2 is 1U , the height of the second fan backplane 3 is 2U; if the read level value is 011, it means that the height of the first fan backplane 2 is 2U, and the height of the second fan backplane 3 is 1U.

When the height of the fan backplane is 3U, the height identification code FAN_BOARD_ID0 of the fan backplane of the first CPLD is the result of adding the height identification code FAN_BOARD1_ID0 of the first fan backplane 2 and the height identification code FAN_BOARD2_ID0 of the second fan backplane 3 ; The height identification code FAN_BOARD_ID1 of the fan backplane of the first CPLD is the result of the height identification code FAN_BOARD1_ID1 of the first fan backplane 2 and the height identification code FAN_BOARD2_ID1 of the second fan backplane 3; the fan backplane of the first CPLD The height identification code FAN_BOARD_ID2 is the result of adding the height identification code FAN_BOARD1_ID2 of the first fan backplane 2 and the height identification code FAN_BOARD2_ID2 of the second fan backplane 3 .

The first inter-board connector 13 and the second inter-board connector 22 can be connected by cables, and the third inter-board connector 34 and the fourth inter-board connector 32 can be connected by cables. Specifically, the first inter-board connection The connector 13 and the second inter-board connector 22 are adapted to the height of the first fan backplane 2 , and the third inter-board connector 34 and the fourth inter-board connector 32 are adapted to the height of the second fan backplane 3 .

The invention effectively solves the problem that the existing server fan control system cannot be applied to fan backplanes of different heights, effectively improves the control efficiency of the server fan system, and expands application scenarios.

In the present invention, the 3U fan backplane can be realized by connecting a 1U fan backplane and a 2U fan backplane in series, and two fan backplanes with different heights share a mainboard, which saves the use of the mainboard on the one hand, and improves the utilization efficiency of the fan backplane on the other hand. , expanding the scope of use.

Embodiment 2

As shown in FIG. 3-FIG. 4, the technical solution of the present invention also provides a method for adjusting a fan control strategy according to the height of the fan backplane, which is implemented on the basis of Embodiment 1 of the present invention, and includes:

S1, the BMC determines the height of the fan backplane by reading the height data of the fan backplane height transmitter of the first CPLD, and sends a corresponding first fan control command according to the height of the fan backplane;

S2, after receiving the first fan control instruction from the BMC, the second CPLD generates a corresponding first fan control signal PWM, and reads the rotational speed of the first fan.

Wherein, in step S1, the BMC determines the height of the fan backplane by reading the level of the level signal at the fan backplane height sending end of the first CPLD. The height of the first fan backplane is 1U or 2U.

The height of the first fan backplane is 1U or 2U. The second CPLD is provided with a one-to-one fan speed control strategy according to the height of the fan backplane. If the height of the fan backplane is 1U, it corresponds to the first fan speed control strategy. The fan speed control strategy, wherein the first fan speed control strategy and the second fan speed control strategy may both exist in the form of tables. The second CPLD determines the height of the first fan backplane according to the first control instruction sent by the BMC, and then determines a corresponding fan speed control strategy according to the height of the first fan backplane.

As shown in FIG. 4 , further, a method for adjusting the fan control strategy according to the height of the fan backplane of the present invention further includes steps S3 and S4:

S3, when the total height of the fan backplane of the fan control system is 3U, identify the fan backplane height identification signal of the second CPLD in the first fan backplane and the fan backplane height of the third CPLD in the second fan backplane After the signal is ANDed by the AND gate logic circuit, it sends the fan backplane height identification terminal of the first CPLD. The BMC reads the height data of the fan backplane height transmitter of the first CPLD, determines the fan backplane height 3U, and sends the corresponding first fan backplane height. The control command is sent to the second CPLD, and the corresponding second fan control command is sent to the third CPLD;

S4, after the second CPLD receives the first fan control command from the BMC, it generates a corresponding first fan control signal PWM, and reads the rotational speed of the first fan; after receiving the second fan control command from the BMC, the third CPLD generates a corresponding The second fan control signal PWM, and read the rotation speed of the second fan.

The height of the first fan backplane is 1U and the height of the second fan backplane is 2U, or the height of the first fan backplane is 2U and the height of the second fan backplane is 1U.

Among them, the second CPLD and the third CPLD are provided with a fan speed control strategy corresponding to the height of the fan backplane. If the height of the fan backplane is 1U, it corresponds to the first fan speed control strategy. If it is a fan backplane The height is 2U, which corresponds to the second fan speed control strategy, wherein the first fan speed control strategy and the second fan speed control strategy may exist in the form of tables. The second CPLD determines the height of the first fan backplane according to the first control instruction sent by the BMC, and then determines a corresponding fan speed control strategy according to the height of the first fan backplane. The third CPLD determines the height of the second fan backplane according to the second control instruction sent by the BMC, and then determines the corresponding fan speed control strategy according to the height of the second fan backplane.

The present invention effectively solves the problem that the existing server fan control method cannot be applied to fan backplanes of different heights, effectively improves the control efficiency of the server fan system, and expands application scenarios.

In the present invention, the 3U fan backplane can be realized by connecting a 1U fan backplane and a 2U fan backplane in series, and two fan backplanes with different heights share a mainboard, which saves the use of the mainboard on the one hand, and improves the utilization efficiency of the fan backplane on the other hand. , expanding the scope of use.

Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, they do not limit the scope of protection of the present invention. Those skilled in the art should understand that on the basis of the technical solutions of the present invention, those skilled in the art do not need to pay creative work. Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (8)

1. a system according to fan backplane height adjustment fan control strategy, it is characterized in that, comprise: mainboard and the first fan backplane, described mainboard comprises BMC, the first CPLD, the first inter-board connector, the described first A fan backplane includes a second CPLD, a second board-to-board connector, and a first fan connector. The fan backplane height identification end of the first CPLD is connected to the first board-to-board connector and the second board-to-board connector through the first board-to-board connector and the second board-to-board connector. The fan backplane height sending end of the two CPLDs is connected, the fan backplane height receiving end of the BMC is connected to the fan backplane height sending end of the first CPLD, and the control signal sending end of the BMC is connected through the first inter-board connector and The second inter-board connector is connected to the second CPLD control signal receiving end. The second CPLD determines the first fan speed control strategy corresponding to the height of the first fan board according to the control signal sent by the BMC. The control of the second CPLD The sending end is connected to the control signal receiving end of the first fan through the first fan connector, and controls the first fan according to the first fan speed control strategy. 2 . The system for adjusting the fan control strategy according to the height of the fan backplane according to claim 1 , wherein the height of the first fan backplane is 1U or 2U. 3 . 3. The system for adjusting a fan control strategy according to the height of a fan backplane according to claim 2, wherein when the total height of the fan backplane of the fan control system is 3U, it further comprises a second fan backplane, wherein the first The height of the fan backplane is 1U, the height of the second fan backplane is 2U, or the height of the first fan backplane is 2U, and the height of the second fan backplane is 1U; the first fan backplane also includes a third inter-board connector , the second fan backplane includes a third CPLD, a fourth board-to-board connector, and a second fan connector, and the second fan backplane communicates with the second fan board through the third board-to-board connector and the fourth board-to-board connector The fan backplane is connected, and the fan backplane height identification end of the third CPLD is connected to the fan backplane height sending end of the second CPLD all the way through the third inter-board connector and the fourth inter-board connector, and the third CPLD The control sending end of the third CPLD is connected to the control signal receiving end of the second fan through the second fan connector, the fan backplane height identification end of the third CPLD is connected to the first input end of the AND gate by the other way, and the second CPLD The other way of the fan backplane height identification terminal is connected with the second input terminal of the AND gate, and the output terminal of the AND gate is connected with the fan backplane height identification terminal of the first CPLD of the main board, and the control signal transmission terminal of the BMC passes through the first CPLD of the main board. The third inter-board connector and the fourth inter-board connector are connected to the third CPLD control signal receiving end, and the third CPLD determines the second fan speed control strategy corresponding to the height of the second fan board according to the control signal sent by the BMC, so The control sending end of the third CPLD is connected to the control signal receiving end of the second fan through the second fan connector, and controls the second fan according to the second fan speed control strategy. 4. A method for adjusting fan control according to the height of the fan backplane, characterized in that it is implemented on the basis of the system for adjusting the fan control strategy according to the height of the fan backplane according to any one of claims 1-3, comprising: The BMC determines the height of the fan backplane by reading the height data of the fan backplane height sender of the first CPLD, and sends the corresponding first fan control command according to the height of the fan backplane; After receiving the first fan control instruction from the BMC, the second CPLD determines the first fan speed control strategy according to the height of the first fan backplane, generates the first fan control signal PWM according to the first fan speed control strategy, and reads the first fan speed. 5. The method for adjusting a fan control strategy according to the height of the fan backplane according to claim 4, wherein the BMC determines the first fan by reading the level of the level signal of the fan backplane height transmitter of the first CPLD Backplane height. 6. The method for adjusting the fan control strategy according to the height of the fan backplane according to claim 5, wherein when the total height of the fan backplane of the fan control system is 3U, the second CPLD in the first fan backplane is After the fan backplane height identification signal of the second fan backplane and the fan backplane height identification signal of the third CPLD in the second fan backplane are ANDed by the AND gate logic circuit, the fan backplane height identification terminal of the first CPLD is sent, and the BMC reads the first The height data of the fan backplane height sender of the CPLD determines the fan backplane height of 3U, sends the corresponding first fan control command to the second CPLD, and sends the corresponding second fan control command to the third CPLD; After receiving the first fan control instruction from the BMC, the second CPLD determines the first fan speed control strategy according to the height of the first fan backplane, generates the first fan control signal PWM according to the first fan speed control strategy, and reads the first fan After receiving the second fan control instruction from the BMC, the third CPLD determines the second fan speed control strategy according to the height of the second fan backplane, and generates the second fan control signal PWM according to the second fan speed control strategy, and reads The speed of the second fan. 7 . The method for adjusting the fan control strategy according to the height of the fan backplane according to claim 4 or 5 , wherein the height of the first fan backplane is 1U or 2U. 8 . 8. The method for adjusting a fan control strategy according to the height of the fan backplane according to claim 6, wherein the height of the first fan backplane is 1U, the height of the second fan backplane is 2U, or the height of the first fan backplane is 1U. It is 2U, and the height of the second fan backplane is 1U.

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