WO2015149577A1

WO2015149577A1 - Storage system, storage device and data storage method

Info

Publication number: WO2015149577A1
Application number: PCT/CN2015/071031
Authority: WO
Inventors: 张洪岽; 王娜
Original assignee: 华为技术有限公司
Priority date: 2014-04-03
Filing date: 2015-01-19
Publication date: 2015-10-08
Also published as: CN103942160B; CN103942160A

Abstract

A storage system, a storage device and a data storage method, which relate to the field of data storage. The storage system comprises a front-end interface (102), a controller (104), and a storage device (106). The storage device (106) comprises a cache unit (106a) and a nonvolatile storage unit (106b). Service data is sent to the cache unit (106a) of the storage device (106) through the front-end interface (102); the storage device (106) receives the serve data and caches the service data to the cache unit (106a); when an external power source (108) is powered down, a standby power source (110) is started to supply power to the storage device (106), and the service data in the cache unit (106a) is written to the nonvolatile storage unit (106b). The received service data is sent to the cache unit (106a) in the storage device (106) through the front-end interface (102), and when the external power source (108) is powered down, the storage device (106) starts the standby power source (110) and writes the service data in the cache unit (106a) to the nonvolatile storage unit (106b), so as to solve the problem in the prior art that data in a memory is lost because the external power source (108) does not restore power supply before the electric quantity of the standby power source (110) is used up, thereby achieving the effect of improving protection performance.

Description

Storage system, storage device and data storage method

Technical field

The present invention relates to the field of data storage, and in particular, to a storage system, a storage device, and a data storage method.

Background technique

In order to improve the I/O (Input/Out put) response capability, a first-level cache (Cache) is usually provided in the existing storage system. When writing data, the storage system firstly receives and caches the data sent by the front-end service through the Cache, and then moves the data to the memory with slow writing speed.

Since the cache cache is a volatile storage unit, the cached data is also lost when the system is powered off. In order to effectively protect the data in the cache when the system is powered off, the existing storage system usually sets backup power to the central processing unit and the memory portion, and divides a part of the memory into a cache of the memory. When the external power supply of the system is powered off, the system starts. The backup power supply is separately powered by the central processing unit and the memory, and the central processing unit controls the memory to enter the self-refresh mode, thereby avoiding data loss in the memory.

The prior art has at least the following problems:

First of all, limited by the power of the backup power supply, the self-refresh mode of the memory can only be maintained for a period of time. If the external power supply is still not restored before the backup power is exhausted, the data in the memory will also be lost, and the protection performance is better. Low; Secondly, the memory capacity in the system is limited, and the part divided into Cache is less, which cannot meet the cache requirement of the large-capacity memory, thereby limiting the capacity expansion of the storage system.

Summary of the invention

In order to solve the problem that the backup power supply in the prior art is exhausted before the power is exhausted, the data in the memory is lost, and the memory capacity in the system is limited, and the cache of the large-capacity non-volatile storage unit cannot be satisfied. The present invention provides a storage system, a memory, a data protection method, and a control unit. The technical solution is as follows:

In a first aspect, a storage system is provided, the storage system comprising: a front end interface, a controller, and a plurality of storage devices; an external power supply for the front end interface, the controller, and the storage device Each of the storage devices includes: a cache unit and a non-volatile storage unit; wherein the cache of the controller is composed of cache units of the plurality of storage devices;

The front-end interface is configured to receive service data, and send the service data to a cache unit of at least one of the plurality of storage devices;

The at least one storage device is configured to receive the service data and cache the cache unit to the at least one storage device; when the external power source is powered off, the backup power source that starts the at least one storage device is the The at least one storage device is powered to write the service data in the cache unit of the at least one storage device to the non-volatile storage unit of the at least one storage device.

In a first possible implementation manner of the first aspect, the front end interface sends the service data to a cache unit of the at least one of the plurality of storage devices, specifically:

The front end interface sends the service data to the controller, and the controller sends the service data to a cache unit of the at least one storage device;

or,

The front end interface sends the service data to a cache unit of the one storage device by a direct memory access form.

In a second possible implementation of the first aspect, each of the backup power sources supplies power to one of the storage devices.

In a third possible implementation manner of the first aspect, the at least one storage device is configured to close the at least after the service data is completely written into the non-volatile storage unit of the at least one storage device A backup power source for a storage device.

In a fourth possible implementation manner of the first aspect, the at least one storage device is configured to cache the service data to a cache unit of the at least one storage device when the external power source resumes power supply.

In a second aspect, a storage device is provided, the storage device being used in a storage system as described above, the storage device comprising: a cache unit, a non-volatile storage unit, a data receiving module, a first cache module, and a power supply Starting the module and writing the module;

The data receiving module is configured to receive service data sent by the front end interface;

The first cache module is configured to cache the service data to the cache unit;

The power boot module is configured to start standby power of the storage device when the external power source is powered off The source supplies power to the storage device;

The writing module is configured to write the service data in the cache unit to the non-volatile storage unit.

In a first possible implementation manner of the second aspect, the data receiving module is specific

Receiving, by the controller, the service data, where the data service is sent by the front end interface to the controller; or

Specifically, the method is configured to receive the service data that is sent by the front end interface by using a direct memory access.

In a second possible implementation manner of the second aspect, the storage device further includes:

And a power-off module, configured to turn off the backup power after the write module completely writes the service data to the non-volatile storage unit.

In a third possible implementation manner of the second aspect, the storage device further includes:

And a second cache module, configured to cache the service data to the cache unit when the external power source resumes power supply.

In a third aspect, a data storage method is provided, the method being used in a storage device as described above, the storage device comprising a cache unit and a non-volatile storage unit; the method comprising:

Receiving service data sent by the front end interface;

Caching the service data to the cache unit;

When the external power source is powered down, the backup power source that starts the storage device supplies power to the storage device, and writes the service data in the cache unit to the non-volatile storage unit.

In a first possible implementation manner of the third aspect, the receiving the service data sent by the front end interface includes:

Receiving, by the controller, the service data, where the data service is sent by the front end interface to the controller;

or,

Receiving the service data sent by the front end interface in the form of direct memory access.

In a second possible implementation manner of the third aspect, the method further includes:

After the service data is completely written to the non-volatile storage unit, the backup power source is turned off.

In a third possible implementation manner of the third aspect, the method further includes:

When the external power source resumes power supply, the service data is buffered to the cache unit.

The beneficial effects brought by the technical solutions provided by the embodiments of the present invention are:

First, the received service data is sent to the cache unit in the storage device through the front-end interface. When the external power supply is powered off, the storage device starts the backup power of the storage device, and writes the service data in the cache unit to the non-volatile device. The volatile storage unit solves the problem that the data in the memory is lost due to the external power supply still not recovering the power supply before the backup power source is exhausted, and the protection performance is improved.

Secondly, the cache setting of the controller is composed of the cache unit of each storage device, and the cache unit is used as the cache of the non-volatile storage unit in the storage device. The storage system only needs to increase the number of storage devices, that is, the storage capacity can be performed. The invention solves the problem that the memory capacity of the storage system in the prior art is limited, and the cache requirement of the large-capacity non-volatile storage unit cannot be satisfied, and the effect of improving the expansion performance of the storage system is achieved.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a system configuration diagram of a storage system according to an embodiment of the present invention;

2 is a system configuration diagram of a storage system according to another embodiment of the present invention;

3 is a schematic structural diagram of a storage device according to an embodiment of the present invention;

4 is a schematic structural diagram of a storage device according to another embodiment of the present invention;

FIG. 5 is a flowchart of a method for storing a data according to an embodiment of the present invention; FIG.

FIG. 6 is a flowchart of a method for storing a data according to another embodiment of the present invention.

detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, a system configuration diagram of a storage system according to an embodiment of the present invention is shown. The storage system can include a front end interface 102, a controller 104, and a plurality of storage devices 106; an external power supply 108 powering the front end interface 102, the controller 104, and the storage device 106; each of the storage devices 106 The buffer unit 106a and the non-volatile storage unit 106b; wherein the cache of the controller 104 is composed of the cache unit of the plurality of storage devices 106a;

The front-end interface 102 is configured to receive service data, and send the service data to a cache unit 106a of at least one of the plurality of storage devices 106;

The at least one storage device 106 is configured to receive the service data and cache the buffer unit 106a of the at least one storage device 106; when the external power source 108 is powered off, start the at least one storage device 106 The backup power source 110 supplies power to the at least one storage device 106, and writes the service data in the cache unit 106a of the at least one storage device 106 to the non-volatile storage unit 106b of the at least one storage device 106.

In summary, the storage system provided by the embodiment of the present invention sends the received service data to the cache unit in the storage device through the front-end interface, and when the external power supply is powered off, the storage device starts the backup power of the storage device. And writing the service data in the cache unit to the non-volatile storage unit, which solves the problem that the data in the memory is lost due to the external power supply still not being restored before the power of the backup power source is exhausted, and the improvement is achieved. The effect of protection performance.

In the storage system provided by the embodiment of the present invention, the cache setting of the controller is composed of a cache unit of each storage device, and the cache unit is used as a cache of a non-volatile storage unit in the storage device, and the storage system only needs to increase storage. The number of devices can expand the storage capacity, which solves the problem that the memory capacity of the storage system in the prior art is limited, and cannot meet the cache requirement of the large-capacity non-volatile storage unit, thereby improving the expansion performance of the storage system.

Referring to FIG. 2, a system configuration diagram of a storage system according to an embodiment of the present invention is shown. The storage system can include a front end interface 202, a controller 204, and a plurality of storage devices 206; an external power supply 208 powering the front end interface 202, the controller 204, and the storage device 206; each of the storage devices 206 The buffer unit 206a and the non-volatile storage unit 206b; wherein the cache of the controller 204 is composed of the cache unit of the plurality of storage devices 206a;

The controller of the storage system (such as the central processing unit CPU) may not set a separate cache, but distribute the cache of the controller to each storage device, and the cache list in each storage device The yuan assumes the role of the controller's cache. Specifically, when the storage system is initialized, the cache unit of each storage device may be set as a prefetchable memory space, so that the controller can directly access the address in the cache unit of each storage device, for example, the CPU may directly The data is written to the specified address in the cache unit, or the CPU can directly read the data in the specified address of the cache unit.

The front-end interface 202 is configured to receive service data, and send the service data to the cache unit 206a of the at least one of the plurality of storage devices 206;

In a storage system, a front-end interface can send the same service data to two or more storage devices. When data in one storage device is lost, backup data in other storage devices can be enabled, thereby improving data security. Sex.

The front-end interface 202 may send the service data to the controller 204, and the controller 204 sends the service data to the cache unit 206b of the at least one storage device 206; or the front-end interface The service data may also be sent to the cache unit 206b of the one less storage device 206 by direct memory access.

Specifically, when the front-end interface sends the service data to the storage device, the service data may be sent to the controller first, and the service data is written by the controller to the cache unit in the storage device, or the front-end interface may also pass DMA (Direct Memory Access). The direct memory access engine queries the controller for the address of the cache unit included in the storage device, and sends the service data directly to the storage device according to the queried address.

The at least one storage device 206 is configured to receive the service data and cache the buffer unit 206a of the at least one storage device 206; when the external power source 208 is powered down, start the at least one storage device 206 The backup power source 210 supplies power to the at least one storage device 206, and writes the service data in the cache unit 206a of the at least one storage device 206 to the non-volatile storage unit 206b of the at least one storage device 206.

The standby power supply may be in an initial state when the controller detects the external power supply drop point, and may control the standby power supply to start to supply power to the storage device; or, the standby power supply may be set to a voltage slightly lower than The voltage of the external power supply is always on. Because the external power supply voltage is slightly higher, when the external power supply works normally, the storage device is powered by the external power supply. When the external power supply is powered off, the backup power supply starts to supply power.

External power supply to the storage system, such as AC/DC (Alternating Current/Direct Current, AC input/DC output) When the power is cut off, the controller may send a power failure notification to each storage device, and after receiving the power failure notification, the storage device transfers the data in the cache unit to the nonvolatile storage unit to Avoid losing data in the cache unit after the backup power is exhausted.

The cache unit may be composed of a static random storage chip, or may be composed of a dynamic random access memory chip, such as a DDR (Double Data Rate Synchronous Dynamic Random Access Memory) 2, DDR3 or DDR4 particles. The cache unit capacity is smaller than the non-volatile memory unit, but the read/write speed is fast.

Each of the backup power sources 210 supplies power to one of the storage devices 206.

To further improve the backup effect of the backup power supply, the storage device can be set to be powered by a separate backup power supply. When one of the backup power supplies fails, only the storage device corresponding to the backup power supply is affected, and other storage devices can still work.

The at least one storage device 206 is configured to turn off the backup power source 210 of the at least one storage device 206 after the service data is completely written into the non-volatile storage unit 206b of the at least one storage device 206.

Among them, the backup power source usually uses a battery to store the power, and if the battery continues to discharge when the discharge exceeds the discharge end voltage value, the internal pressure of the battery may increase, and the reversibility of the positive and negative active materials may be affected. Damage, resulting in a significant reduction in battery capacity. In order to prevent the backup power supply from being damaged due to over-discharge and increasing the service life of the device, after the storage device detects that the data stored in the cache unit has all been transferred to the non-volatile storage unit, the backup power supply can be controlled to stop the power supply.

The at least one storage device 206 is configured to cache the service data to the cache unit 206a of the at least one storage device when the external power source 210 resumes power supply.

The service data cached in the cache unit may be data to be accessed by the controller in the storage system. Therefore, when the external power source resumes power supply, the storage device may write the service data stored by the cache unit before the power failure to the cache unit again. So that the controller can quickly access the read. For example, when the external power supply of the storage system is restored, the controller sends a power restoration notification to each storage device. After receiving the power restoration notification, the storage device detects that the external power supply resumes power supply, and then starts to further detect whether the storage system is completely restored. Normally, if it is detected that the storage system is completely restored, the stored service data in the cache unit before the power failure is resumed from the non-volatile storage unit and written back to the cache unit. After the control unit writes the data back to the cache unit, the control unit notifies the storage system to restore the data storage or data read. The service unit may also rewrite the stored service data in the cache unit from the non-volatile storage unit back to the cache unit after the power-off notification is received.

The storage device 206 is further configured to control the backup power source 210 to start charging after detecting that the external power source 208 resumes power supply.

In addition, in the storage system provided by the embodiment of the present invention, the storage device is further configured to control the standby power supply to stop the power supply after detecting that the data is completely written into the non-volatile storage unit, thereby avoiding over-discharge of the standby power supply, thereby improving the service life of the device. .

Please refer to FIG. 3, which is a schematic structural diagram of a storage device according to an embodiment of the present invention. The storage device may be a general-purpose storage device such as a hard disk for use in the data storage system as shown in FIG. 1 or FIG. 2 above. The storage system includes: a front end interface, a controller, and a plurality of storage devices; the external power supply supplies power to the front end interface, the controller, and the storage device; the storage device may include: a cache unit 301, a nonvolatile storage unit 302, and data. a receiving module 303, a first cache module 304, a power boot module 305, and a write module 306; the cache of the controller is composed of cache units of a plurality of storage devices;

The data receiving module 303 is configured to receive service data sent by the front end interface.

The first cache module 304 is configured to cache the service data to the cache unit 301;

The power startup module 305 is configured to: when the external power is powered off, start the backup power of the storage device to supply power to the storage device;

The writing module 306 is configured to write the service data in the cache unit 301 to the non-volatile storage unit 302.

In summary, the storage device provided by the embodiment of the present invention receives the service data sent by the front-end interface and caches the cache unit. When the external power supply is powered off, the storage device starts the backup power of the storage device, and the cache unit is The service data is written into the non-volatile storage unit, which solves the problem that the data in the memory is lost due to the external power supply still not being restored before the power of the backup power source is exhausted, and the protection performance is improved.

The storage device provided by the embodiment of the present invention, by setting the cache unit of the storage device as a component of the cache of the controller and using the cache unit as a cache of the non-volatile storage unit, the storage system only needs to increase the number of storage devices. That is, the storage capacity can be expanded, which solves the problem that the memory capacity of the storage system in the prior art is limited, and cannot meet the cache requirement of the large-capacity non-volatile storage unit, thereby achieving the effect of improving the expansion performance of the storage system.

Please refer to FIG. 4, which is a schematic structural diagram of a storage device according to an embodiment of the present invention. The storage device may be a general-purpose storage device such as a hard disk for use in the data storage system as shown in FIG. 1 or FIG. 2 above. The storage system includes: a front end interface, a controller, and a plurality of storage devices; the external power supply supplies power to the front end interface, the controller, and the storage device; the storage device may include: a cache unit 401, a nonvolatile storage unit 402, and data. a receiving module 403, a first cache module 404, a power boot module 405, and a write module 406; the cache of the controller is composed of cache units of a plurality of storage devices;

The data receiving module 403 is configured to receive service data sent by the front end interface;

The first cache module 404 is configured to cache the service data to the cache unit 401;

The power boot module 405 is configured to start a backup power of the storage device to supply power to the storage device when the external power source is powered off;

The writing module 406 is configured to write the service data in the cache unit 401 to the non-volatile storage unit 402.

In the storage system shown in FIG. 1 or FIG. 2, the controller (such as the central processing unit CPU) may not set a separate cache, but distribute the controller's cache to each storage device, and the cache in each storage device. The unit assumes the role of the controller's cache. Specifically, when the storage system is initialized, The cache unit of each storage device can be set as a prefetchable memory space, so that the controller can directly access the address in the cache unit of each storage device, for example, the CPU can directly write data to the specified address in the cache unit. Or, the CPU can also directly read the data in the specified address of the cache unit.

The data receiving module 403 is specifically configured to receive the service data sent by the controller, where the data service is sent by the front end interface to the controller; or specifically, the front end interface is sent by using a direct memory access form. The business data.

When the external power supply of the storage system, such as AC/DC (Alternating Current/Direct Current), is powered off, the controller may send a power-off notification to each storage device, and the storage device receives the power-off notification. Transfer the data in the cache unit to the non-volatile storage unit to prevent the data in the cache unit from being lost after the backup power is exhausted.

Among them, each backup power supply only supplies power to one storage device.

The storage device further includes:

The power-off module 407 is configured to turn off the backup power after the write module 406 completely writes the service data to the non-volatile storage unit 402.

The storage device further includes:

The second cache module 408 is configured to cache the service data to the cache unit 401 when the external power source resumes power supply.

The service data cached in the cache unit may be data to be accessed by the controller in the storage system. Therefore, when the external power source resumes power supply, the storage device may write the service data stored by the cache unit before the power failure to the cache unit again. So that the controller can quickly access the read. For example, when the external power supply of the storage system is restored, the controller sends a power restoration notification to each storage device. After receiving the power restoration notification, the storage device detects that the external power supply resumes power supply, and then starts to further detect whether the storage system is completely restored. Normally, if it is detected that the storage system is completely restored, the stored service data in the cache unit before the power failure is resumed from the non-volatile storage unit and written back to the cache unit. After the control unit writes the data back to the cache unit, the control unit notifies the storage system to resume the data storage or the data read service; or the control unit may restart the stored service data in the cache unit before the power is cut off after receiving the power restoration notification. The cache unit is written back from the non-volatile memory unit.

The storage device provided by the embodiment of the present invention, by setting the cache unit of the storage device as a component of the cache of the controller and using the cache unit as a cache of the non-volatile storage unit, the storage system only needs to increase the number of storage devices. That is, the storage capacity can be expanded to solve the prior art. The memory capacity of the storage system is limited, and the problem of the cache requirement of the large-capacity non-volatile storage unit cannot be met, thereby achieving the effect of improving the expansion performance of the storage system.

In addition, the storage device provided by the embodiment of the present invention controls the standby power supply to stop the power supply after detecting that the data is completely written into the non-volatile storage unit, thereby avoiding the over-discharge of the standby power supply and achieving the effect of improving the service life of the device.

Please refer to FIG. 5, which is a flowchart of a method for storing a data according to an embodiment of the present invention. The data storage method can be used to prevent data in the cache from being lost when the external power is turned off in the storage device shown in FIG. 3 or 4. The storage device can be a general-purpose storage device such as a hard disk and can be used in a large-capacity data storage system. As shown in FIG. 1 or FIG. 2, the storage system includes: a front end interface, a controller, and a plurality of storage devices; the external power supply supplies power to the front end interface, the controller, and the storage device; and the storage device includes: a cache unit and nonvolatile storage. Unit; the controller's cache consists of cache units for several storage devices. The data storage method can include:

Step 502: Receive service data sent by the front end interface.

Step 504: Cache the service data to a cache unit.

Step 506: When the external power source is powered off, the backup power source that starts the storage device supplies power to the storage device, and writes the service data in the cache unit to the non-volatile storage unit.

In summary, the data storage method provided by the embodiment of the present invention receives the service data sent by the front-end interface and caches the cache unit. When the external power supply is powered off, the storage device starts the backup power of the storage device, and the cache unit is The service data in the non-volatile storage unit is solved, which solves the problem that the data in the memory is lost due to the external power supply still not being restored before the power of the backup power source is exhausted, and the protection performance is improved.

Please refer to FIG. 6, which is a flowchart of a method for storing a data according to an embodiment of the present invention. The data storage method can be used to prevent data in the cache from being lost when the external power is turned off in the storage device shown in FIG. 3 or 4. The storage device can be a general-purpose storage device such as a hard disk and can be used in a large-capacity data storage system. As shown in FIG. 1 or FIG. 2, the storage system includes: a front end interface, a controller, and a plurality of storage devices; the external power supply supplies power to the front end interface, the controller, and the storage device; and the storage device includes: a cache unit and nonvolatile storage. Unit; the controller's cache consists of several storage devices The backup cache unit is composed. The data storage method can include:

Step 602: Receive service data sent by the front-end interface, and cache the service data to the cache unit.

Specifically, the service data sent by the controller may be received, where the data service is sent by the front end interface to the controller; or the service data sent by the front end interface by using a direct memory access may be received.

Step 604, when the external power supply is powered off, start the backup device of the storage device to supply power to the storage device, and write the service data in the cache unit to the non-volatile storage unit;

In order to further improve the backup effect of the backup power supply, the storage devices can be set to be powered by a separate backup power supply, that is, each backup power supply only supplies power to one storage device. When one of the backup power supplies fails, only the storage device corresponding to the backup power source is affected, and other storage devices can still work.

Step 606, after the service data is completely written into the non-volatile storage unit, the standby power is turned off;

Among them, the backup power source usually uses a battery to store the power, and the battery is in the process of discharging, if it is super When the discharge voltage of the overdischarge continues to discharge, the internal pressure of the battery may increase, and the reversibility of the active materials of the positive and negative electrodes may be damaged, so that the capacity of the battery is significantly reduced. In order to prevent the backup power supply from being damaged due to over-discharge and increasing the service life of the device, after the storage device detects that the data stored in the cache unit has all been transferred to the non-volatile storage unit, the backup power supply can be controlled to stop the power supply.

Step 608: When the external power source resumes power supply, the service data is buffered to the cache unit.

Secondly, the data storage method provided by the embodiment of the present invention controls the standby power supply to stop the power supply after detecting that the data is completely written into the non-volatile storage unit, thereby avoiding the over-discharge of the standby power supply and achieving the effect of improving the service life of the device.

It should be noted that, when the storage device provided by the foregoing embodiment stores data, only the division of each functional module is described. In an actual application, the function distribution may be completed by different functional modules according to requirements. The internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the storage device provided by the foregoing embodiment is in the same concept as the data storage method embodiment, and the specific implementation process is described in the method embodiment. Said.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium. The storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

A storage system, comprising: a front end interface, a controller, and a plurality of storage devices; an external power supply supplies power to the front end interface, the controller, and the storage device; each of the storage The device includes: a cache unit and a non-volatile storage unit; wherein the cache of the controller is composed of a cache unit of the plurality of storage devices;

The front-end interface is configured to receive service data, and send the service data to a cache unit of at least one of the plurality of storage devices;

The at least one storage device is configured to receive the service data and cache the cache unit to the at least one storage device; when the external power source is powered off, the backup power source that starts the at least one storage device is the The at least one storage device is powered to write the service data in the cache unit of the at least one storage device to the non-volatile storage unit of the at least one storage device.
The storage system according to claim 1, wherein the front-end interface sends the service data to a cache unit of at least one of the plurality of storage devices, specifically:

The front end interface sends the service data to the controller, and the controller sends the service data to a cache unit of the at least one storage device;

or,

The front end interface sends the service data to a cache unit of the one storage device by a direct memory access form.
The storage system of claim 1 wherein each of said backup power supplies powers one of said storage devices.
The storage system according to claim 1, wherein said at least one storage device is configured to close said service data after said service data is completely written to said non-volatile storage unit of said at least one storage device At least one backup power source for the storage device.
The storage system according to claim 1, wherein the at least one storage device is configured to buffer the service data to the at least one storage when the external power source resumes power supply The cache unit of the storage device.
A storage device, wherein the storage device is used in a storage system according to any one of claims 1 to 5, the storage device comprising: a cache unit, a non-volatile storage unit, a data receiving module, and a a cache module, a power boot module, and a write module;

The data receiving module is configured to receive service data sent by the front end interface;

The first cache module is configured to cache the service data to the cache unit;

The power boot module is configured to start a backup power of the storage device to supply power to the storage device when the external power source is powered off;

The writing module is configured to write the service data in the cache unit to the non-volatile storage unit.
The storage device according to claim 6, wherein the data receiving module is specifically configured to receive the service data sent by a controller, where the data service is sent by the front end interface to the controller; or

Specifically, the method is configured to receive the service data that is sent by the front end interface by using a direct memory access.
The storage device according to claim 6, wherein the storage device further comprises:

And a power-off module, configured to turn off the backup power after the write module completely writes the service data to the non-volatile storage unit.
The storage device according to claim 6, wherein the storage device further comprises:

And a second cache module, configured to cache the service data to the cache unit when the external power source resumes power supply.
A data storage method, wherein the method is used in a storage device according to any one of claims 6 to 10, the storage device comprising a cache unit and a non-volatile storage unit; :

Receiving service data sent by the front end interface;

Caching the service data to the cache unit;

When the external power source is powered down, the backup power source that starts the storage device supplies power to the storage device, and writes the service data in the cache unit to the non-volatile storage unit.
The method according to claim 10, wherein the receiving the service data sent by the front end interface comprises:

Receiving, by the controller, the service data, where the data service is sent by the front end interface to the controller;

or,

Receiving the service data sent by the front end interface in the form of direct memory access.
The method of claim 10, wherein the method further comprises:

After the service data is completely written to the non-volatile storage unit, the backup power source is turned off.
The method of claim 10, wherein the method further comprises:

When the external power source resumes power supply, the service data is buffered to the cache unit.