CN111338676B - BMC (baseboard management controller) firmware upgrading system and method with in-band mode and out-of-band mode - Google Patents

Abstract

The invention relates to the technical field of servers, and provides a BMC firmware upgrade system and method with both in-band and out-of-band modes. The system includes a BMC module, an expansion module and a dedicated network port; the dedicated network port provides the BMC module with a conventional BMC The firmware is upgraded in out-of-band mode; the extension module receives the BMC firmware upgrade package sent by the host, and forwards or transparently transmits the received BMC firmware upgrade package to the BMC module; the BMC module receives the BMC firmware upgrade package forwarded or transparently transmitted by the extension module At the same time, it analyzes the received BMC firmware upgrade package, and executes the BMC firmware in-band upgrade action, so as to achieve compatibility with in-band and out-of-band upgrade methods for BMC firmware, and provide more reliability policies for the storage system, which can The storage expansion system equipped with BMC is applied to the unified storage system and server system at the same time, which greatly improves the reliability and flexibility of device deployment and management.

Description

A BMC firmware upgrade system and method with both in-band and out-of-band modes

technical field

The invention belongs to the technical field of servers, and in particular relates to a BMC firmware upgrade system and method with both in-band and out-of-band modes.

Background technique

In the server system, the dedicated network port of the BMC is generally used for FW upgrade. This method is a common out-of-band upgrade method that separates management and services. In the storage system, due to the reason of storing the customized OS on the host side, the device FW upgrade is more often performed in an in-band manner. With the development of server and storage business, the boundaries between the two are becoming more and more blurred, especially the storage expansion cabinet system, which can be applied on both the storage host side and the server side, which requires more requirements for the FW upgrade method of BMC .

At present, in the storage system with integrated disk and control, the BMC is attached to the PCH as an end point device of the PCH. The upper-layer OS performs in-band BMC FW upgrade through the PCIE link between the PCH and the BMC. However, in the scenario of disk control separation, the control cabinet is connected to the storage expansion cabinet through high-speed cables (only high-speed SAS or PCIE can run in the middle), and the OS of the control cabinet can only be connected to the SAS Expander and PCIE on the expansion cabinet through the PCIE/SAS link. Expansion devices such as the Switch cannot directly link the BMC in the expansion cabinet, nor can the in-band upgrade of the BMC on the expansion cabinet be implemented.

SUMMARY OF THE INVENTION

Aiming at the defects in the prior art, the present invention provides a BMC firmware upgrade system with both in-band and out-of-band modes, aiming to solve the problem that the in-band BMC firmware cannot be implemented in the case of disk control separation in the prior art. upgrade problem.

The technical solution provided by the present invention is: a BMC firmware upgrade system with both in-band and out-of-band modes, including a BMC module, an expansion module and a dedicated network port;

The dedicated network port is connected to the BMC module, and is used to provide the BMC module with a conventional BMC firmware out-of-band mode upgrade;

Described expansion module, is arranged on the board card of storage system, is connected with host end host and described BMC module, is used for receiving the BMC firmware upgrade package sent by described host end, and the BMC firmware upgrade package that receives is forwarded or transparently transmitted to the BMC module;

The BMC module is arranged on the board card of the storage system and is used to receive the BMC firmware upgrade package forwarded or transparently transmitted by the expansion module, parse the received BMC firmware upgrade package, and execute the BMC firmware upgrade package. Internal upgrade action;

Wherein, before the expansion module and the host side establish an in-band upgrade communication interaction, the host side controls and closes the dedicated network port through the expansion module, and when the BMC module executes the BMC firmware in-band upgrade action ends When the host side opens the dedicated network port through the expansion module, and at the same time, when the BMC module fails to perform an in-band upgrade of the BMC firmware, the host side opens the dedicated network port through the expansion module At the same time, the BMC firmware out-of-band upgrade action is performed in cooperation with the BMC module.

As an improved solution, the expansion module specifically includes:

an upgrade package receiving module, connected with the host end, for receiving the BMC firmware upgrade package sent by the host end;

a forwarding module, connected with the upgrade package receiving module, for forwarding the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module;

The transparent transmission module is connected to the upgrade package receiving module, and is used for transparently transmitting the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module.

As an improved solution, the expansion module further includes:

an upgrade package transmission mode determination module, configured to determine a transmission mode of the upgrade package with the host according to the size of the RAM of the expansion module, and the transmission mode includes a one-time transmission mode and a fragmented transmission mode;

When using the fragmentation transmission mode to transmit the BMC firmware upgrade package, the host side further includes a data packet fragmentation module;

The data packet fragmentation module is configured to fragment the BMC firmware upgrade package according to the space size of the RAM of the expansion module, and generate several BMC firmware upgrade fragmentation packages.

As an improved solution, when the BMC firmware upgrade package is transmitted between the host and the expansion module in a fragmented transmission mode, the BMC module further includes a fragmented package assembly module;

The fragmentation package assembling module is configured to assemble several of the BMC firmware upgrade fragmentation packages forwarded or transparently transmitted by the expansion module to generate a complete BMC firmware upgrade package.

As an improved solution, the corresponding expansion modules of the multiple storage nodes of the storage system are connected in communication with each other;

When the in-band data link of one of the storage nodes fails, the normally running expansion module forwards the BMC firmware upgrade package to the BMC module corresponding to the faulty in-band data link, and the faulty in-band data link corresponds to the BMC firmware upgrade package. The BMC module executes the BMC firmware upgrade action.

Another object of the present invention is to provide a BMC firmware upgrade method with both in-band and out-of-band modes based on a BMC firmware upgrade system with both in-band and out-of-band modes, the method comprising the following steps :

The host side controls and closes the dedicated network port through the expansion module;

The expansion module receives the BMC firmware upgrade package sent by the host, and forwards or transparently transmits the received BMC firmware upgrade package to the BMC module;

The BMC module receives the BMC firmware upgrade package forwarded or transparently transmitted by the expansion module, parses the received BMC firmware upgrade package, and executes the BMC firmware in-band upgrade action;

When the BMC firmware in-band upgrade action performed by the BMC module ends, the host side opens the dedicated network port through the expansion module;

When the BMC module fails to perform an in-band upgrade of the BMC firmware, the host side cooperates with the BMC module to perform an out-of-band upgrade of the BMC firmware while opening the dedicated network port through the expansion module.

As an improved solution, the step of receiving the BMC firmware upgrade package sent by the host side by the expansion module, and forwarding or transparently transmitting the received BMC firmware upgrade package to the BMC module specifically includes the following steps:

The upgrade package receiving module receives the BMC firmware upgrade package sent by the host;

The forwarding module forwards the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module;

The transparent transmission module transparently transmits the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module.

As a kind of improved scheme, described method also comprises the following steps:

According to the space size of the RAM of the expansion module, the upgrade package transmission mode determination module and the host side determine the upgrade package transmission mode, and the transmission mode includes a one-time transmission mode and a fragmented transmission mode;

When the BMC firmware upgrade package is transmitted in the fragmented transmission mode, the data packet fragmentation module on the host side fragments the BMC firmware upgrade package according to the size of the RAM of the expansion module, and generates several A BMC firmware upgrade shard package.

As an improved solution, when the BMC firmware upgrade package is transmitted between the host and the expansion module in a fragmented transmission mode, the method further includes the following steps:

The fragmentation package assembling module assembles several of the BMC firmware upgrade fragmentation packages forwarded or transparently transmitted by the expansion module to generate a complete BMC firmware upgrade package.

As a kind of improved scheme, described method also comprises the following steps:

Corresponding expansion modules of the multiple storage nodes of the storage system are connected to each other for communication, and when the in-band data link of one of the storage nodes fails, the expansion module that operates normally corresponds to the failed in-band data link. The BMC module forwards the BMC firmware upgrade package, and the BMC module corresponding to the faulty in-band data link executes the BMC firmware upgrade action.

In the embodiment of the present invention, the BMC firmware upgrade system with both in-band and out-of-band modes includes a BMC module, an extension module, and a dedicated network port; the dedicated network port is connected to the BMC module and is used for all Described BMC module provides the upgrade of conventional BMC firmware out-of-band mode; Described expansion module, is arranged on the board card of storage system, is connected with host end host and described BMC module, is used for receiving the BMC firmware that described host end sends upgrade package, and forward or transparently transmit the received BMC firmware upgrade package to the BMC module; the BMC module is set on the board card of the storage system and is used to receive the BMC firmware forwarded or transparently transmitted by the expansion module upgrade package, parse the received BMC firmware upgrade package at the same time, and execute the BMC firmware in-band upgrade action, so as to be compatible with both in-band and out-of-band upgrade methods of BMC firmware, and provide more reliable and reliable storage systems. It can make the storage expansion system equipped with BMC apply to the unified storage system and server system at the same time, which greatly improves the reliability and flexibility of device deployment and management.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the specific embodiments or the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. In the drawings, each element or section is not necessarily drawn to actual scale.

Fig. 1 is the structural block diagram of the BMC firmware upgrade system of both in-band and out-of-band modes provided by the present invention;

Fig. 2 is the structural block diagram of the expansion module provided by the present invention;

Fig. 3 is the realization flow chart of the BMC firmware upgrade method of both in-band and out-of-band modes provided by the present invention;

Fig. 4 is the realization flow chart that the expansion module provided by the present invention receives the BMC firmware upgrade package sent by the host, and forwards or transparently transmits the received BMC firmware upgrade package to the BMC module.

Detailed ways

Embodiments of the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to more clearly illustrate the technical solutions of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

FIG. 1 is a structural block diagram of a BMC firmware upgrade system with both in-band and out-of-band modes provided by the present invention. For convenience of description, only the parts related to the embodiments of the present invention are shown in the figure.

The BMC firmware upgrade system with both in-band and out-of-band modes includes BMC modules, expansion modules and dedicated network ports;

The dedicated network port is connected to the BMC module, and is used to provide the BMC module with a conventional BMC firmware out-of-band mode upgrade;

Described expansion module, is arranged on the board card of storage system, is connected with host end host and described BMC module, is used for receiving the BMC firmware upgrade package sent by described host end, and the BMC firmware upgrade package that receives is forwarded or transparently transmitted to the BMC module;

The BMC module is arranged on the board card of the storage system and is used to receive the BMC firmware upgrade package forwarded or transparently transmitted by the expansion module, parse the received BMC firmware upgrade package, and execute the BMC firmware upgrade package. Internal upgrade action;

Wherein, before the expansion module and the host side establish an in-band upgrade communication interaction, the host side controls and closes the dedicated network port through the expansion module, and when the BMC module executes the BMC firmware in-band upgrade action ends When the host side opens the dedicated network port through the expansion module, and at the same time, when the BMC module fails to perform an in-band upgrade of the BMC firmware, the host side opens the dedicated network port through the expansion module At the same time, the BMC firmware out-of-band upgrade action is performed in cooperation with the BMC module.

In this embodiment, the host side communicates with the expansion module through a SAS or PCIE high-speed link, and the BMC module and the expansion module communicate through a GE, I2C or URAT link, including the BMC firmware upgrade package. Forwarding or transparent transmission, etc., the data exchanged in this communication includes management data and business data.

In the embodiment of the present invention, as shown in FIG. 2 , the expansion module specifically includes:

an upgrade package receiving module, connected with the host end, for receiving the BMC firmware upgrade package sent by the host end;

a forwarding module, connected with the upgrade package receiving module, for forwarding the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module;

a transparent transmission module, connected to the upgrade package receiving module, for transparently transmitting the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module;

In this embodiment, the forwarding module and the transparent transmission module have both functions, and one of them is selected to transmit the BMC firmware upgrade package, which will not be repeated here.

In this embodiment, as shown in FIG. 2 , the expansion module further includes:

an upgrade package transmission mode determination module, configured to determine a transmission mode of the upgrade package with the host according to the size of the RAM of the expansion module, and the transmission mode includes a one-time transmission mode and a fragmented transmission mode;

When using the fragmentation transmission mode to transmit the BMC firmware upgrade package, the host side further includes a data packet fragmentation module;

The data packet fragmentation module is configured to fragment the BMC firmware upgrade package according to the space size of the RAM of the expansion module, and generate several BMC firmware upgrade fragmentation packages.

In this embodiment, when the BMC firmware upgrade package is transmitted between the host and the expansion module in a fragmented transmission mode, the BMC module further includes a fragmented package assembly module;

The fragmentation package assembling module is configured to assemble several of the BMC firmware upgrade fragmentation packages forwarded or transparently transmitted by the expansion module to generate a complete BMC firmware upgrade package.

Among them, the size of the BMC firmware upgrade package is generally about 32MB. The expansion module decides whether to perform fragmented transmission of the BMC FW upgrade package with the host HOST according to its own RAM size: if the expansion module RAM is too small, the BMC FW upgrade package will be divided into The slices are transmitted to the BMC module. After the BMC module receives all the sliced packets, it first performs data packet splicing and then upgrades its own FW; if the expansion module RAM is large enough, the expansion module receives the BMC FW upgrade package from the host HOST at one time and sends it to the BMC Upgrade your own FW.

In the embodiment of the present invention, the interaction between the expansion module and the host side realizes the in-band upgrade of the BMC firmware, and the setting of the dedicated network port realizes the out-of-band upgrade of the BMC firmware, which provides convenience for users, improves product quality, and improves the stability of server operation. sturdiness and reliability.

In the embodiment of the present invention, the corresponding expansion modules of the multiple storage nodes of the storage system are connected in communication with each other;

When the in-band data link of one of the storage nodes fails, the normally running expansion module forwards the BMC firmware upgrade package to the BMC module corresponding to the faulty in-band data link, and the faulty in-band data link corresponds to the BMC firmware upgrade package. The BMC module executes the BMC firmware upgrade action;

The expansion modules of the storage node communicate with each other through GE, NTB and other links. This setting can be used when a data link abnormality or other abnormality occurs between the expansion module of one of the storage nodes and the BMC module. BMC FW upgrade package forwarding improves the reliability of BMC FW upgrade.

In the embodiment of the present invention, as shown in FIG. 1 , the BMC firmware upgrade system with both in-band and out-of-band modes also includes a serial port module, a wireless module and an indication module, wherein:

The serial port module is used to realize the information exchange between the BMC module and external devices;

The wireless module is connected to the serial port module, and is used to convert the serial port module signal into wireless signals such as WIFI. External devices can exchange information with the BMC module without a physical serial port cable. Of course, the BMC module between multiple storage nodes can also be used. Data interconnection is carried out through the wireless module, which will not be repeated here;

Indication module: set on the board, directly controlled by the serial port module, and externally indicates the FW upgrade status of the current BMC module.

Of course, the BMC firmware upgrade system with both in-band and out-of-band modes also includes other module structures, which will not be repeated here.

Fig. 3 shows the realization flow chart of the BMC firmware upgrade method with both in-band and out-of-band modes provided by the present invention, which specifically includes the following steps:

In step S101, the host side controls and closes the dedicated network port through the expansion module;

In step S102, the expansion module receives the BMC firmware upgrade package sent by the host, and forwards or transparently transmits the received BMC firmware upgrade package to the BMC module;

In step S103, the BMC module receives the BMC firmware upgrade package forwarded or transparently transmitted by the expansion module, parses the received BMC firmware upgrade package, and executes the BMC firmware in-band upgrade action;

In step S104, when the BMC firmware in-band upgrade action performed by the BMC module ends, the host side opens the dedicated network port through the expansion module;

In step S105, when the BMC module fails to perform an in-band upgrade of the BMC firmware, the host side cooperates with the BMC module to perform an out-of-band upgrade of the BMC firmware while opening the dedicated network port through the expansion module. .

In this embodiment, as shown in FIG. 4 , the step of the expansion module receiving the BMC firmware upgrade package sent by the host, and forwarding or transparently transmitting the received BMC firmware upgrade package to the BMC module specifically includes the following steps: step:

In step S201, the upgrade package receiving module receives the BMC firmware upgrade package sent by the host;

In step S202, the forwarding module forwards the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module;

In step S203, the transparent transmission module transparently transmits the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module.

In this embodiment, according to the space size of the RAM of the expansion module, the upgrade package transmission mode determination module and the host side determine the upgrade package transmission mode, and the transmission mode includes a one-time transmission mode and a fragmented transmission mode;

When the BMC firmware upgrade package is transmitted in the fragmented transmission mode, the data packet fragmentation module on the host side fragments the BMC firmware upgrade package according to the size of the RAM of the expansion module, and generates several A BMC firmware upgrade shard package.

In the embodiment of the present invention, when the BMC firmware upgrade package is transmitted between the host and the expansion module in a fragmented transmission mode, the method further includes the following steps:

The fragmentation package assembling module assembles several of the BMC firmware upgrade fragmentation packages forwarded or transparently transmitted by the expansion module to generate a complete BMC firmware upgrade package.

In the embodiment of the present invention, the corresponding expansion modules of the multiple storage nodes of the storage system are connected to each other for communication, and when the in-band data link of one of the storage nodes fails, the expansion module that is running normally will be sent to the faulty expansion module. The BMC module corresponding to the in-band data link forwards the BMC firmware upgrade package, and the BMC module corresponding to the faulty in-band data link executes the BMC firmware upgrade action.

In the embodiment of the present invention, the BMC firmware upgrade system with both in-band and out-of-band modes includes a BMC module, an extension module, and a dedicated network port; the dedicated network port is connected to the BMC module and is used for all Described BMC module provides the upgrade of conventional BMC firmware out-of-band mode; Described expansion module, is arranged on the board card of storage system, is connected with host end host and described BMC module, is used for receiving the BMC firmware that described host end sends upgrade package, and forward or transparently transmit the received BMC firmware upgrade package to the BMC module; the BMC module is set on the board card of the storage system and is used to receive the BMC firmware forwarded or transparently transmitted by the expansion module upgrade package, parse the received BMC firmware upgrade package at the same time, and execute the BMC firmware in-band upgrade action, so as to be compatible with both in-band and out-of-band upgrade methods of BMC firmware, and provide more reliable and reliable storage systems. It can make the storage expansion system equipped with BMC apply to the unified storage system and server system at the same time, which greatly improves the reliability and flexibility of device deployment and management.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that the foregoing embodiments can still be used for The technical solutions described in the examples are modified, or some or all of the technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and all of them should cover within the scope of the claims and description of the invention.

Claims (10)

1. a BMC firmware upgrade system having both in-band and out-of-band two modes, is characterized in that, comprises BMC module, expansion module and special network port; The dedicated network port is connected to the BMC module, and is used to provide the BMC module with an out-of-band upgrade of conventional BMC firmware; Described expansion module, is arranged on the board card of storage system, is connected with host end host and described BMC module, is used for receiving the BMC firmware upgrade package sent by described host end, and the BMC firmware upgrade package that receives is forwarded or transparently transmitted to the BMC module; The BMC module is arranged on the board card of the storage system and is used to receive the BMC firmware upgrade package forwarded or transparently transmitted by the expansion module, parse the received BMC firmware upgrade package, and execute the BMC firmware upgrade package. Internal upgrade action; Wherein, before the expansion module and the host side establish an in-band upgrade communication interaction, the host side controls and closes the dedicated network port through the expansion module, and when the BMC module executes the BMC firmware in-band upgrade action ends When the host side opens the dedicated network port through the expansion module, and at the same time, when the BMC module fails to perform an in-band upgrade of the BMC firmware, the host side opens the dedicated network port through the expansion module At the same time, the BMC firmware out-of-band upgrade action is performed in cooperation with the BMC module. 2. the BMC firmware upgrade system of both in-band and out-of-band modes according to claim 1, is characterized in that, described expansion module specifically comprises: an upgrade package receiving module, connected with the host side, for receiving the BMC firmware upgrade package sent by the host side; a forwarding module, connected with the upgrade package receiving module, for forwarding the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module; The transparent transmission module is connected to the upgrade package receiving module, and is used for transparently transmitting the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module. 3. the BMC firmware upgrade system of both in-band and out-of-band modes according to claim 2, is characterized in that, described expansion module also comprises: an upgrade package transmission mode determination module, configured to determine a transmission mode of the upgrade package with the host according to the size of the RAM of the expansion module, and the transmission mode includes a one-time transmission mode and a fragmented transmission mode; When using the fragmentation transmission mode to transmit the BMC firmware upgrade package, the host side further includes a data packet fragmentation module; The data packet fragmentation module is configured to fragment the BMC firmware upgrade package according to the space size of the RAM of the expansion module, and generate several BMC firmware upgrade fragmentation packages. 4. the BMC firmware upgrade system of both in-band and out-of-band modes according to claim 3, is characterized in that, when adopting slice transmission mode to transmit described BMC between described host end and described expansion module During the firmware upgrade package, the BMC module further includes a fragmented package assembly module; The fragmentation package assembling module is configured to assemble several of the BMC firmware upgrade fragmentation packages forwarded or transparently transmitted by the expansion module to generate a complete BMC firmware upgrade package. 5. The BMC firmware upgrade system of both in-band and out-of-band modes according to claim 3, is characterized in that, the corresponding expansion modules of the multi-storage nodes of the storage system are communicated and connected to each other; When the in-band data link of one of the storage nodes fails, the normally running expansion module forwards the BMC firmware upgrade package to the BMC module corresponding to the faulty in-band data link, and the faulty in-band data link corresponds to the BMC firmware upgrade package. The BMC module performs the BMC firmware upgrade action. 6. a BMC firmware upgrade method based on the BMC firmware upgrade system of both in-band and out-of-band two modes based on claim 1, is characterized in that, described method Include the following steps: The host side controls and closes the dedicated network port through the expansion module; The expansion module receives the BMC firmware upgrade package sent by the host, and forwards or transparently transmits the received BMC firmware upgrade package to the BMC module; The BMC module receives the BMC firmware upgrade package forwarded or transparently transmitted by the expansion module, parses the received BMC firmware upgrade package, and executes the BMC firmware in-band upgrade action; When the BMC firmware in-band upgrade action performed by the BMC module ends, the host side opens the dedicated network port through the expansion module; When the BMC module fails to perform an in-band upgrade of the BMC firmware, the host side cooperates with the BMC module to perform an out-of-band upgrade of the BMC firmware while opening the dedicated network port through the expansion module. 7. the BMC firmware upgrade method of both in-band and out-of-band modes according to claim 6, is characterized in that, described expansion module receives the BMC firmware upgrade package that described host side sends, and will receive The step of forwarding or transparently transmitting the BMC firmware upgrade package to the BMC module specifically includes the following steps: The upgrade package receiving module receives the BMC firmware upgrade package sent by the host; The forwarding module forwards the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module; The transparent transmission module transparently transmits the BMC firmware upgrade package received by the upgrade package receiving module to the BMC module. 8. the BMC firmware upgrade method of both in-band and out-of-band modes according to claim 7, is characterized in that, described method also comprises the following steps: According to the space size of the RAM of the expansion module, the upgrade package transmission mode determination module and the host side determine the upgrade package transmission mode, and the transmission mode includes a one-time transmission mode and a fragmented transmission mode; When the BMC firmware upgrade package is transmitted in the fragmented transmission mode, the data packet fragmentation module on the host side fragments the BMC firmware upgrade package according to the size of the RAM of the expansion module, and generates several BMCs. Firmware upgrade shard package. 9. the BMC firmware upgrade method of both in-band and out-of-band modes according to claim 8, is characterized in that, when adopting slice transmission mode to transmit described BMC between described host end and described expansion module When upgrading the firmware package, the method further includes the following steps: The fragmentation package assembling module assembles several of the BMC firmware upgrade fragmentation packages forwarded or transparently transmitted by the expansion module to generate a complete BMC firmware upgrade package. 10. The BMC firmware upgrade method of both in-band and out-of-band modes according to claim 8, is characterized in that, described method also comprises the following steps: Corresponding expansion modules of the multiple storage nodes of the storage system are connected to each other for communication, and when the in-band data link of one of the storage nodes fails, the expansion module in normal operation corresponds to the failed in-band data link. The BMC module forwards the BMC firmware upgrade package, and the BMC module corresponding to the faulty in-band data link executes the BMC firmware upgrade action.

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