CN117149076A

CN117149076A - RAID stripe dynamic management method and device for SSD controller and computer equipment

Info

Publication number: CN117149076A
Application number: CN202311115379.6A
Authority: CN
Inventors: 李建; 邱一霄; 赵连庚
Original assignee: Suzhou Yilian Information System Co Ltd
Current assignee: Suzhou Yilian Information System Co Ltd
Priority date: 2023-08-31
Filing date: 2023-08-31
Publication date: 2023-12-01

Abstract

The application relates to a RAID stripe dynamic management method and device of an SSD controller, a computer device and a storage medium, wherein the method comprises the following steps: creating a RAID stripe and a RAID space dynamic mapping table through software; when the SSD controller calculates the stripe parity, the RAID parity space corresponding to the stripe is searched through the dynamic mapping table, and the RAID parity is updated according to the newly written data; when a new stripe is created, judging whether an idle RAID space exists; if there is free RAID space, then free RAID space is allocated and a new stripe map is directed to the newly allocated RAID space. The application reduces the complexity of the system, simplifies the design of the system and improves the performance of the system.

Description

RAID stripe dynamic management method and device for SSD controller and computer equipment

Technical Field

The application relates to the technical field of solid state disks, in particular to a RAID stripe dynamic management method and device of an SSD controller, computer equipment and a storage medium.

Background

SSDs (solid state drives) and their widespread use in various applications, have now gradually replaced traditional HDDs (mechanical hard drives) in the PC market, providing users with a better experience in terms of reliability and performance.

Currently, the RAID stripe management of the SSD controller generally adopts a static management mode: i.e., the RAID stripe is statically bound to the corresponding RAID parity space. When the RAID space of the controller is insufficient to accommodate RAID space of all open stripes, the design requires software to be continuously informed of deleting and reconstructing the stripes in the RAID space swap-in and swap-out process, so that the software design is complex, and the system performance is affected.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a method, an apparatus, a computer device, and a storage medium for dynamically managing RAID stripes of an SSD controller.

A method for dynamically managing RAID stripes of an SSD controller, the method comprising:

creating a RAID stripe and a RAID space dynamic mapping table through software;

when the SSD controller calculates the stripe parity, the RAIDparity space corresponding to the stripe is searched through the dynamic mapping table, and the RAID parity is updated according to the newly written data;

when a new stripe is created, judging whether an idle RAID space exists;

if there is free RAID space, then free RAID space is allocated and a new stripe map is directed to the newly allocated RAID space.

In one embodiment, when creating the new stripe, the step of determining whether there is free RAID space further includes:

if no RAID space is free when creating a new stripe, selecting a stripe which is not used at present, swapping out the stripe space to HMB or NAND, and then pointing the newly created stripe map to the newly freed space.

In one embodiment, the method further comprises:

before writing data into the stripe, if the RAID space of the stripe map is in HMB or NAND, selecting an empty RAID space, exchanging the stripe space from the HMB or NAND, and then updating the stripe map to point to the exchanged RAID space.

In one embodiment, the method further comprises:

and when the stripe is closed, releasing the RAID space corresponding to the stripe, and modifying the corresponding mapping into invalid mapping.

An SSD controller RAID stripe dynamic management apparatus, the apparatus comprising:

the creating module is used for creating a RAID stripe and a RAID space dynamic mapping table through software;

the calculating and updating module is used for searching a RAID space corresponding to the stripe through the dynamic mapping table when the SSD controller calculates the stripe parity, and updating the RAID parity according to the newly written data;

the judging module is used for judging whether an idle RAID space exists or not when a new stripe is created;

and the space allocation module is used for allocating the free RAID space and mapping the new stripe to the newly allocated RAID space if the free RAID space exists.

In one embodiment, the apparatus further comprises a strip swap-out module for:

In one embodiment, the apparatus further comprises a tape swap-in module for:

In one embodiment, the apparatus further comprises a space release module for:

A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any one of the methods described above when the computer program is executed.

A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the methods described above.

The RAID stripe dynamic management method, the device, the computer equipment and the storage medium of the SSD controller establish a RAID stripe and a RAID space dynamic mapping table through software; when the SSD controller calculates the stripe parity, the RAID parity space corresponding to the stripe is searched through the dynamic mapping table, and the RAID parity is updated according to the newly written data; when a new stripe is created, judging whether an idle RAID space exists; if there is free RAID space, then free RAID space is allocated and a new stripe map is directed to the newly allocated RAID space. The RAID stripe and RAID space dynamic mapping is dynamically created by software, so that in the process of changing in and out RAID space, the reconstructed stripe is not required to be deleted, only the mapping of the RAID stripe and RAID space is required to be updated, the complexity of the system is reduced, the design of the system is simplified, and the performance of the system is improved.

Drawings

FIG. 1 is a flow chart of a method for dynamically managing RAID stripes of an SSD controller in one embodiment;

FIG. 2 is a diagram of a dynamic mapping of a Parity space and a stripe in one embodiment;

FIG. 3 is a schematic illustration of a strip change out in one embodiment;

FIG. 4 is a schematic illustration of a strip change in one embodiment;

FIG. 5 is a schematic diagram of stripe deletion in one embodiment;

FIG. 6 is a block diagram of an SSD controller RAID stripe dynamic management device in one embodiment;

FIG. 7 is a block diagram of another embodiment of an SSD controller RAID stripe dynamic management device;

FIG. 8 is a block diagram of an SSD controller RAID stripe dynamic management device in yet another embodiment;

FIG. 9 is a block diagram of an SSD controller RAID stripe dynamic management device in yet another embodiment;

fig. 10 is an internal structural view of a computer device in one embodiment.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

Currently, the RAID stripe management of the SSD controller generally adopts a static management mode: i.e., the RAID stripe is statically bound to the corresponding RAID parity space. Specifically, at initialization, the software tells the RAID hardware module of the Party address space, which is statically bound to the physical stripe. When the RAID space of the controller is insufficient to accommodate RAID space of all open stripes, the design requires software to be continuously informed of deleting and reconstructing the stripes in the RAID space swap-in and swap-out process, so that the software design is complex, and the system performance is also influenced. In addition, when the RAID parity of the SSD is exhausted, a new logical stripe ls_10 is created at this time, the software needs to record the state of the physical stripe ps_0 corresponding to ls_2 (for subsequent recovery), then delete the physical stripe ps_0, and reassign it to the logical stripe ls_10, so that the software design is complex, and the system performance is also affected.

Based on the method, the application provides a RAID stripe dynamic management method of an SSD controller, which aims to reduce the complexity of a system and improve the performance of the system.

In one embodiment, as shown in fig. 1, there is provided a method for dynamically managing RAID stripes of an SSD controller, the method comprising:

step 102, creating a RAID stripe and a RAID space dynamic mapping table through software;

104, when the SSD controller calculates the stripe parity, searching a RAID parity space corresponding to the stripe through the dynamic mapping table and updating the RAID parity according to the newly written data;

step 106, when creating a new stripe, judging whether an idle RAID space exists;

step 108, if there is free RAID space, then allocate the free RAID space and map the new stripe to the newly allocated RAID space.

In this embodiment, a method for dynamically managing RAID stripes of an SSD controller is provided, where the RAID stripes and the RAID parity space are dynamically mapped, and the mapping is dynamically created by software, and the state of the RAID stripes is not changed due to the change of the mapping in the life cycle of one RAID stripe. When the SSD controller calculates the stripe parity, the mapping table needs to be searched to find the RAID parity space corresponding to the stripe, and the RAIDparity is updated according to the newly written data.

Specifically, as shown in the schematic diagram of the dynamic mapping between the Parity space and the stripe in fig. 2, a stripe mapping table is provided in the RAID module, and the number of stripes that can be managed by the stripe mapping table can be greatly exceeded by the number of stripes that can be simultaneously accommodated by the RAID Parity space. When a new stripe is created, if there is free RAID space, the free RAID space is allocated, and the stripe map is directed to the newly allocated space. When the RAID parity of the stripe is insufficient in space, if the HMB is available, when the HMB is swapped out, the mapping address is pointed to the HMB space address; if HMB is not available, then temporary parity is written to NAND, and the mapped address is pointed to the NAND space address.

In the embodiment, a RAID stripe and a RAID space dynamic mapping table are created through software; when the SSD controller calculates the stripe parity, the RAID parity space corresponding to the stripe is searched through the dynamic mapping table, and the RAID parity is updated according to the newly written data; when a new stripe is created, judging whether an idle RAID space exists; if there is free RAID space, then free RAID space is allocated and a new stripe map is directed to the newly allocated RAID space. In the application, the RAID stripe and RAIDspace dynamic mapping is dynamically created by software, so that the reconstructed stripe is not required to be deleted in the process of changing in and out of RAID space, and only the mapping of the RAID stripe and RAID space is required to be updated, thereby reducing the complexity of the system, simplifying the design of the system and improving the performance of the system.

In one embodiment, a method for dynamically managing RAID stripes of an SSD controller is provided, where the method further includes, after the step of determining whether there is free RAID space when creating a new stripe: if no RAID space is free when creating a new stripe, selecting a stripe which is not used at present, swapping out the stripe space to HMB or NAND, and then pointing the newly created stripe map to the newly freed space.

Specifically, referring to the stripe swap-out schematic shown in fig. 3, if there is no free RAID space when a stripe is newly created, it is necessary to select a stripe that is not currently used, swap out its parity to HMB or NAND, and then point the newly created stripe map to the newly freed space. Fig. 3 illustrates the HMB swap-out as an example: before creating a new stripe S_8, the corresponding parity of S_0 is swapped to HMB (stripe S_0' S state is still preserved, no software scratch is needed), and stripe S_8 is then pointed to parity 0.

In one embodiment, a method for dynamically managing RAID stripes of an SSD controller is provided, the method further comprising: before writing data into the stripe, if the RAID space of the stripe map is in HMB or NAND, selecting an empty RAID space, exchanging the stripe space from the HMB or NAND, and then updating the stripe map to point to the exchanged RAID space.

Specifically, referring to the schematic diagram of stripe swap-in shown in FIG. 4, if a stripe requiring a subsequent write is found not to be in RAID parity, it needs to be swapped in from HMB or NAND to RAID parity space first. The example of fig. 4 describes this process: s_1 is swapped out of the raidapatity space before s_0 is needed to be written next, and then s_0 is swapped in. This process involves that the state of the stripe is preserved and no RAID hardware is required to recreate or delete the stripe.

In the above embodiment, in the swap-in and swap-out process of RAID parity, the reconstructed stripe is not required to be deleted, only the mapping between the RAID stripe and the RAID parity space is required to be updated, the system design is simplified, and the system performance is improved

In one embodiment, a method for dynamically managing RAID stripes of an SSD controller is provided, the method further comprising: and when the stripe is closed, releasing the RAID space corresponding to the stripe, and modifying the corresponding mapping into invalid mapping.

Specifically, referring to the schematic diagram of stripe deletion shown in fig. 5, when a stripe is closed, its corresponding raidpatity space is released, and the mapping is modified to be invalid.

It should be understood that, although the steps in the flowcharts of fig. 1-5 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1-5 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or stages are performed necessarily occur in sequence, but may be performed alternately or alternately with at least a portion of the other steps or sub-steps or stages of other steps.

In one embodiment, as shown in fig. 6, there is provided an SSD controller RAID stripe dynamic management apparatus 600, the apparatus comprising:

a creating module 601, configured to create a RAID stripe and a RAID parity space dynamic mapping table by using software;

the computing update module 602 is configured to find a RAID space corresponding to a stripe through a dynamic mapping table when the SSD controller computes the stripe parity, and update the RAID parity according to newly written data;

a judging module 603, configured to judge whether there is a free raidtatity space when creating a new stripe;

and a space allocation module 604, configured to allocate the free RAID space and map a new stripe to the newly allocated RAID space if the free RAID space exists.

In one embodiment, as shown in fig. 7, there is provided an SSD controller RAID stripe dynamic management apparatus 600, the apparatus further comprising a stripe swap-out module 605 for:

In one embodiment, as shown in fig. 8, there is provided an SSD controller RAID stripe dynamic management apparatus 600, the apparatus further comprising a stripe swap-in module 606 for:

In one embodiment, as shown in fig. 9, there is provided an SSD controller RAID stripe dynamic management apparatus 600, the apparatus further comprising a space release module 607 for:

The specific limitation of the SSD controller RAID stripe dynamic management apparatus may be referred to as the limitation of the SSD controller RAID stripe dynamic management method, and is not described herein.

In one embodiment, a computer device is provided, the internal structure of which may be as shown in FIG. 10. The computer device includes a processor, a memory, and a network interface connected by a device bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The nonvolatile storage medium stores an operating device, a computer program, and a database. The internal memory provides an environment for the operation of the operating device and the computer program in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, implements a method for dynamically managing RAID stripes of an SSD controller.

It will be appreciated by those skilled in the art that the structure shown in FIG. 10 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.

In one embodiment, a computer device is provided that includes a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the method embodiments above when executing the computer program.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the above method embodiments.

Those skilled in the art will appreciate that implementing all or part of the above described embodiment methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. A method for dynamically managing RAID stripes of an SSD controller, the method comprising:

creating a RAID stripe and a RAID space dynamic mapping table through software;

when the SSD controller calculates the stripe parity, the RAID parity space corresponding to the stripe is searched through the dynamic mapping table, and the RAID parity is updated according to the newly written data;

when a new stripe is created, judging whether an idle RAID space exists;

2. The SSD controller RAID stripe dynamic management method of claim 1, wherein the step of determining whether there is free RAID space when creating a new stripe further comprises:

3. The SSD controller RAID stripe dynamic management method of claim 2, further comprising:

4. The SSD controller RAID stripe dynamic management method of any of claims 1-3, wherein the method further comprises:

5. An SSD controller RAID stripe dynamic management apparatus, the apparatus comprising:

6. The SSD controller RAID stripe dynamic management device of claim 5, further comprising a stripe swap-out module to:

7. The SSD controller RAID stripe dynamic management apparatus of claim 6, further comprising a stripe swap-in module to:

8. The SSD controller RAID stripe dynamic management device of any one of claims 5-7, wherein the device further comprises a space release module to:

9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 4 when the computer program is executed.

10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 4.