CN106371950B - Method and device for realizing RAID level conversion - Google Patents

Method and device for realizing RAID level conversion Download PDF

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CN106371950B
CN106371950B CN201510428541.9A CN201510428541A CN106371950B CN 106371950 B CN106371950 B CN 106371950B CN 201510428541 A CN201510428541 A CN 201510428541A CN 106371950 B CN106371950 B CN 106371950B
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raid level
disk
service data
address
data
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CN106371950A (en
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杨绍明
李彬
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ZTE Corp
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ZTE Corp
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware

Abstract

The invention discloses a method and a device for realizing RAID level conversion, comprising the following steps: when an independent Redundant Array of Independent Disks (RAID) level conversion instruction is received, judging whether the remaining available space of the system meets the requirement of RAID level conversion or not according to pre-recorded occupation information of the current RAID level disk and the remaining available space information of the system; and when the requirement of RAID level conversion is met, establishing a new RAID level disk in the residual available space of the system, establishing a mapping incidence relation between the occupied address of the current RAID level disk and the address of the new RAID level disk, and completing the RAID level conversion. The method can realize RAID level conversion without data transfer, thereby avoiding the problem of service interruption caused by data transfer; the new RAID level disk is established quickly, and the time consumption of level conversion is reduced.

Description

Method and device for realizing RAID level conversion
Technical Field
The present invention relates to a disk array technology, and more particularly, to a method and apparatus for implementing Redundant Array of Independent Disks (RAID) level conversion.
Background
A Redundant Array of Independent Disks (RAID) is a technology that combines a plurality of Independent hard disks (physical hard disks) in different ways to form a hard Disk group (logical hard Disk), so as to provide higher storage performance than a single hard Disk and provide data backup capability. The different ways of composing the disk array form the corresponding RAID level. Different RAID levels have corresponding performance in data reliability and read-write performance.
Currently, RAID is generally divided into RAID0, RAID1, RAID3, RAID5, RAID6, RAID10, and the like. To meet storage system availability, and/or performance, and/or capacity requirements, the translation of the RAID levels is selected. For example, to save space, a RAID level of 1 is converted to a RAID level of 5. To improve reliability, RAID level 5 is converted to RAID level 6. Patent application No. CN200910174224.3 discloses "a method and apparatus for RAID level conversion", which specifically discloses: when the level-changing operation is carried out, data moving is carried out in advance, data in the RAID format before changing the level is recalculated according to the data in the RAID format after changing the level, and the level-changing operation of the RAID is completed only after the whole data moving is completed, namely the level conversion of the RAID is completed; the user can only perform new service operation after finishing grade conversion, and the new service operation can not be performed in the grade conversion process, which may cause service interruption and influence the overall service performance. Patent No. US2004133743 discloses a method for exhibition and logic device extension (Raid apparatus and local device extension method), and specifically discloses that stripe is used to process Raid level change, and it takes a lot of time to process level change, and a user needs to wait for completion of level change to perform a service, which may cause service interruption.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a method and an apparatus for implementing RAID level conversion, which can implement level conversion quickly without interrupting a service.
In order to achieve the object of the present invention, the present invention provides a method for implementing RAID level conversion, when receiving an independent redundant disk array RAID level conversion instruction, the method includes:
judging whether the remaining available space of the system meets the requirement of RAID level conversion or not according to pre-recorded occupation information of the current RAID level disk and the remaining available space information of the system;
and when the requirement of RAID level conversion is met, establishing a new RAID level disk in the residual available space of the system, and establishing a mapping incidence relation between the occupied address of the current RAID level disk and the address of the new RAID level disk to complete RAID level conversion.
Further, when the remaining available space of the system does not meet the requirement of RAID level conversion, the method further includes: determining that the level conversion fails and feeding back information of the level conversion failure to the user.
Further, the method further comprises: when the system is in an idle state, the system is in a standby state,
converting the data on the current RAID level disk according to the data format of the new RAID level;
and transferring the data on the current RAID level disk after completing the data format conversion to a disk space corresponding to the address of the new RAID level disk according to the mapping incidence relation.
Further, the method further comprises:
and recording the address information occupied by the new RAID level disk and the address information of the occupied space of each disk in the system.
Further, when the transfer of the data on the current RAID level disk is not completed, the method further includes:
when reading the service data, inquiring whether the current RAID level disk contains the service data, and if so, reading the service data; if the service data is not contained, reading the service data from the new RAID level disk according to the mapping association relation;
when writing in the service data, judging whether the new RAID level disk contains enough space for writing in the service data according to the initial address and the length of the written service data, and when the space for writing in the service data is enough, writing in the service data and updating the address information occupied by the new RAID level disk and the address mapping association relation; and when the space for writing the service data is not contained enough, the service data writing failure is fed back.
Further, the mapping association specifically includes:
and the incidence relation of the initial addresses of the spaces of the current RAID level and the new RAID level in each disk in the system.
In another aspect, the present application further provides an apparatus for implementing RAID level conversion, including: a judging unit, a level converting unit; wherein the content of the first and second substances,
the judging unit is used for judging whether the remaining available space of the system meets the requirement of RAID level conversion or not according to the pre-recorded occupation information of the current RAID level disk and the remaining available space information of the system when receiving the RAID level conversion instruction;
and the level conversion unit is used for establishing a new RAID level disk in the residual available space of the system and establishing a mapping association relation between the occupied address of the current RAID level disk and the address of the new RAID level disk to complete RAID level conversion when the judgment unit judges that the requirement of RAID level conversion is met.
Further, the device also comprises a feedback unit, which is used for determining the failure of the level conversion and feeding back the information of the failure of the level conversion to the user when the judging unit judges that the remaining available space of the system does not meet the requirement of RAID level conversion.
Further, the device also comprises a data conversion transfer unit used for transferring the data when the system is idle,
converting the data on the current RAID level disk according to the data format of the new RAID level;
and transferring the data on the current RAID level disk after completing the data format conversion to a disk space corresponding to the address of the new RAID level disk according to the mapping incidence relation.
Furthermore, the device also comprises a recording unit, which is used for recording the occupation information of the current RAID level disk, the information of the remaining available space of the system, the address information occupied by the new RAID level disk and the address information of the occupied space of each disk in the system.
Further, the apparatus includes a read and write unit for, when the transfer of data on the current RAID level disk is not completed,
when reading the service data, inquiring whether the current RAID level disk contains the service data, and if so, reading the service data; if the service data is not contained, reading the service data from the new RAID level disk according to the mapping association relationship established by the level conversion unit;
when the service data is written in, judging whether the new RAID level disk comprises enough space for writing in the service data according to the initial address and the length of the written service data, and when the space for writing in the service data is enough, writing in the service data and updating the address information occupied by the new RAID level disk of the recording unit and the address mapping incidence relation established by the level conversion unit; and when the space for writing the service data is not contained enough, the service data writing failure is fed back.
Further, the mapping association specifically includes:
and the incidence relation of the initial addresses of the spaces of the current RAID level and the new RAID level in each disk in the system.
Compared with the prior art, the technical scheme of the application comprises the following steps: when an independent Redundant Array of Independent Disks (RAID) level conversion instruction is received, judging whether the remaining available space of the system meets the requirement of RAID level conversion or not according to pre-recorded occupation information of the current RAID level disk and the remaining available space information of the system; and when the requirement of RAID level conversion is met, establishing a new RAID level disk in the residual available space of the system, establishing a mapping incidence relation between the occupied address of the current RAID level disk and the address of the new RAID level disk, and completing the RAID level conversion. The method can realize RAID level conversion without data transfer, thereby avoiding the problem of service interruption caused by data transfer; the new RAID level disk is established quickly, and the time consumption of level conversion is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a method of implementing RAID level translation in accordance with the present invention;
FIG. 2 is a block diagram of an apparatus for implementing RAID level translation according to the present invention;
FIG. 3 is a flow chart of a method of the first embodiment of the present invention;
FIG. 4 is a flow chart of a method of a second embodiment of the present invention;
FIG. 5 is a flow chart of a method of a third embodiment of the present invention;
FIG. 6 is a diagram illustrating the composition of a current RAID level disk according to embodiment 4 of the present invention;
FIG. 7 is a diagram illustrating the components of a new RAID level disk according to embodiment 4 of the present invention;
FIG. 8 is a flowchart of a method according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Fig. 1 is a flowchart of a method for implementing RAID level conversion according to the present invention, and as shown in fig. 1, when receiving an RAID level conversion instruction, the method includes:
step 100, judging whether the remaining available space of the system meets the requirement of RAID level conversion or not according to pre-recorded occupation information of the current RAID level disk and the remaining available space information of the system;
it should be noted that it is common knowledge of those skilled in the art to determine whether the remaining available space of the system meets the requirement of RAID level conversion; generally, when the remaining available space of the system is larger than or equal to the size occupied by the current RAID level disk, the requirement for RAID level conversion is met, and details are not described here.
Step 101, when the requirement of RAID level conversion is satisfied, establishing a new RAID level disk in the remaining available space of the system, and establishing a mapping association relationship between the occupied address of the current RAID level disk and the address of the new RAID level disk to complete RAID level conversion.
When the remaining available space of the system does not meet the requirement of RAID level conversion, the method of the invention also comprises the following steps: determining that the level conversion fails and feeding back information of the level conversion failure to the user.
The method of the invention also comprises the following steps: when the system is in an idle state, the system is in a standby state,
converting data on the disk of the current RAID level according to the data format of the new RAID level;
and transferring the data on the current RAID level disk after completing the data format conversion to a disk space corresponding to the address of the new RAID level disk according to the mapping incidence relation.
The method of the invention also comprises the following steps:
and recording the address information occupied by the new RAID level disk and the address information of the occupied space of each disk in the system.
When the data transfer on the current RAID level disk is not finished, the method of the invention also comprises the following steps:
when the service data is read, inquiring whether the current RAID level disk contains the service data, and if so, reading the service data; if the data does not contain the service data, reading the service data from the new RAID level disk according to the mapping association relation;
when the service data is written, judging whether the new RAID level disk contains enough space for writing the service data according to the initial address and the length of the written service data, and when the space for writing the service data is enough, writing the service data and updating the address information and the address mapping incidence relation occupied by the new RAID level disk; and when the space for writing the service data is not contained enough, the service data writing failure is fed back.
It should be noted that whether the new RAID level disk contains enough space for writing of the service data is a routine technical means for those skilled in the art; generally, for example, 4 disks with a capacity of 1T are used to create a RAID5 with a capacity of 600G (where 1 parity disk and the other 3 data disks), then the capacity of RAID5 is 600G, the used space on each disk is 200G, and the remaining space on each disk is 800G. If the rank is to be changed to RAID6 level (2 check disks, and the others are data disks), each disk needs to occupy 300G, and the original remaining space is 800G, so that the operation of RAID level conversion can be performed.
The mapping association relationship specifically includes:
and the incidence relation between the current RAID level and the initial address of the space of the new RAID level in each disk in the system.
The method can realize RAID level conversion without data transfer, thereby avoiding the problem of service interruption caused by data transfer; the new RAID level disk is established quickly, and the time consumption of level conversion is reduced.
Fig. 2 is a structural diagram of an apparatus for implementing RAID level translation according to the present invention, as shown in fig. 2, including: a judging unit, a level converting unit; wherein the content of the first and second substances,
the judging unit is used for judging whether the remaining available space of the system meets the requirement of RAID level conversion or not according to the pre-recorded occupation information of the current RAID level disk and the remaining available space information of the system when receiving the RAID level conversion instruction;
and the level conversion unit is used for establishing a new RAID level disk in the residual available space of the system and establishing a mapping association relation between the occupied address of the current RAID level disk and the address of the new RAID level disk to complete RAID level conversion when the judgment unit judges that the requirement of RAID level conversion is met.
The mapping association relationship specifically includes:
and the incidence relation between the current RAID level and the initial address of the space of the new RAID level in each disk in the system.
The device also comprises a feedback unit which is used for determining the failure of the level conversion and feeding back the information of the failure of the level conversion to the user when the judging unit judges that the remaining available space of the system does not meet the requirement of the RAID level conversion.
The device of the invention also comprises a data conversion transfer unit which is used for transferring the data to the data conversion unit when the system is idle,
converting data on the disk of the current RAID level according to the data format of the new RAID level;
and transferring the data on the current RAID level disk after completing the data format conversion to a disk space corresponding to the address of the new RAID level disk according to the mapping incidence relation.
The device also comprises a recording unit for recording the occupation information of the current RAID level disk, the residual available space information of the system, the address information occupied by the new RAID level disk and the address information of the occupied space of each disk in the system.
The apparatus of the present invention further comprises a read and write unit for, when the transfer of data on the current RAID level disk is not completed,
when the service data is read, inquiring whether the current RAID level disk contains the service data, and if so, reading the service data; if the RAID level disk does not contain the service data, reading the service data from the new RAID level disk according to the mapping association relationship established by the level conversion unit;
when the service data is written, judging whether the new RAID level disk contains enough space for writing the service data according to the initial address and the length of the written service data, and when the space for writing the service data is enough, writing the service data and updating the address information occupied by the new RAID level disk of the recording unit and the address mapping incidence relation established by the level conversion unit; and when the space for writing the service data is not contained enough, the service data writing failure is fed back.
The process of the present invention is illustrated in detail by the following specific examples, which are provided for illustration only and are not intended to limit the scope of the invention.
Example 1
Fig. 3 is a flowchart of a method according to a first embodiment of the present invention, as shown in fig. 3, including:
and 300, reading the pre-recorded system residual available space information when receiving the RAID level conversion instruction.
Step 301, judging whether the remaining available space of the system meets the requirement of RAID level conversion or not according to the occupation information of the current RAID level disk and the remaining available space information of the system;
here, the occupation information of the current RAID level disk and the information of the remaining available space of the system may be recorded through a corresponding list, for example, the maximum supportable number of data disks of one RAID is 16, and the maximum number of check disks is 2, by the following fields
The field "used space" represents the space occupied by the disk at the current RAID level;
the field "available space" represents the space remaining available in the current system, i.e., the disk space remaining available for the system to establish a new RAID level;
the field "current RAID Start" indicates the starting address of disk space on the old RAID level;
the field "end of current RAID" indicates the end address of the disk space at the old RAID level;
the field "new RAID Start" indicates the starting address of disk space at the new RAID level;
the field "new RAID end" indicates the end address of the disk space at the new RAID level;
the field "D0 Start" indicates the starting address of used disk space on disk D0;
the field "D0 end" indicates the end address of used disk space on disk D0;
the field "D1 Start" indicates the starting address of used disk space on disk D1;
the field "D1 end" indicates the end address of used disk space on disk D1;
the field "D2 Start" indicates the starting address of used disk space on disk D2;
the field "D2 end" indicates the end address of used disk space on disk D2;
the field "D3 Start" indicates the starting address of used disk space on disk D3;
the field "D3 end" indicates the end address of used disk space on disk D3;
the field "D4 Start" indicates the starting address of used disk space on disk D4;
the field "D4 end" indicates the end address of used disk space on disk D4;
the field "D5 Start" indicates the starting address of used disk space on disk D5;
the field "D5 end" indicates the end address of used disk space on disk D5;
the field "D6 Start" indicates the starting address of used disk space on disk D6;
the field "D6 end" indicates the end address of used disk space on disk D6;
the field "D7 Start" indicates the starting address of used disk space on disk D7;
the field "D7 end" indicates the end address of used disk space on disk D7;
the field "D8 Start" indicates the starting address of used disk space on disk D8;
the field "D8 end" indicates the end address of used disk space on disk D8;
the field "D9 Start" indicates the starting address of used disk space on disk D9;
the field "D9 end" indicates the end address of used disk space on disk D9;
the field "D10 Start" indicates the starting address of used disk space on disk D10;
the field "D10 end" indicates the end address of used disk space on disk D10;
the field "D11 Start" indicates the starting address of used disk space on disk D11;
the field "D11 end" indicates the end address of used disk space on disk D11;
the field "D12 Start" indicates the starting address of used disk space on disk D12;
the field "D12 end" indicates the end address of used disk space on disk D12;
the field "D13 Start" indicates the starting address of used disk space on disk D13;
the field "D13 end" indicates the end address of used disk space on disk D13;
the field "D14 Start" indicates the starting address of used disk space on disk D14;
the field "D14 end" indicates the end address of used disk space on disk D14;
the field "D15 Start" indicates the starting address of used disk space on disk D15;
the field "D15 end" indicates the end address of used disk space on disk D15;
the field "Pstart" indicates the starting address of the used disk space on disk P;
the field "Pend" indicates the end address of the used disk space on disk P;
the field "qstart" indicates the starting address of the used disk space on disk Q;
the field "qtend" indicates the end address of the used disk space on disk Q.
Step 302, when the requirement of RAID level conversion is satisfied, a new RAID level disk is established in the remaining available space of the system, and a mapping association relationship between the occupied address of the current RAID level disk and the address of the new RAID level disk is established, thereby completing the RAID level conversion. And when the requirement of RAID level conversion is not met, the feedback level conversion fails.
The mapping association relationship specifically includes:
and mapping association relationship between the current RAID level and the initial address of the space of the new RAID level in each disk in the system. Taking the new RAID level including 15 data disks, and two check disks P and Q as an example, the mapping association relationship includes the following information:
the field "D0" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D0;
the field "D1" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D1;
the field "D2" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D2;
the field "D3" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D3;
the field "D4" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D4;
the field "D5" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D5;
the field "D6" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D6;
the field "D7" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D7;
the field "D8" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D8;
the field "D9" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D9;
the field "D10" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D10;
the field "D11" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D11;
the field "D12" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D12;
the field "D13" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D13;
the field "D14" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D14;
the field "D15" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk D15;
the field "P" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on the disk P;
the field "Q" indicates the starting address of the corresponding stored data at the current RAID level and the new RAID level on disk Q.
Step 303, feeding back the level conversion success to the user.
Example 2
After the new RAID level disk and the mapping association relationship are established, RAID level conversion is completed, and the service of the system is not influenced; fig. 4 is a flowchart of a method according to a second embodiment of the present invention, as shown in fig. 4, including:
step 400, inquiring whether the current RAID level disk contains the service data or not according to the instruction for reading the service data; when the current RAID level disk contains the business data, executing step 401 and reading the business data; otherwise, step 402 is performed.
Step 401, reading the service data.
And step 402, reading the service data from the new RAID level disk according to the mapping association relationship.
After the service data is read in step 401 or 402, step 403 is executed.
And step 403, feeding back a result of reading the service data to the user.
Example 3
After the new RAID level disk and the mapping association relationship are established, RAID level conversion is completed, and the service of the system is not influenced; fig. 5 is a flowchart of a method according to a third embodiment of the present invention, as shown in fig. 5, including:
step 500, according to the user writing operation instruction, acquiring the initial address and the length of the written service data.
Step 501, reading address information occupied by a new RAID level disk, acquiring a space available for writing service data, and executing step 5020 when judging whether the space contains enough space for writing service data; otherwise, go to step 5030;
step 5020, writing in the service data. The method specifically comprises the following steps:
and judging whether the written service data is on the disk of the new RAID level or the disk of the current RAID level according to the acquired initial address of the written service data and the information of the mapping incidence relation.
If the service data to be written is on the current RAID level disk, acquiring a write address from the disk of the new RAID level; if the data to be written is on the disk of the new RAID level, the business data is directly written on the disk of the new RAID level.
Step 5030, the failure of writing the service data is fed back to the user.
Step 5021, updating the address information occupied by the new RAID level disk and the address mapping association relation.
Step 5022, feeding back the operation result of the service data writing to the user.
Example 4
Fig. 6 is a schematic diagram of the composition of the current RAID level disk according to embodiment 4 of the present invention, and as shown in fig. 6, the current RAID level disk has at least 3 data disks D0, D1, and D2, and further includes a check disk P composition.
Fig. 7 is a schematic diagram illustrating the composition of a new RAID level disk according to embodiment 4 of the present invention, and as shown in fig. 7, the new RAID level disk is composed of at least 2 data disks D0 and D1, and a check disk P and a check disk Q.
This embodiment mainly describes a process of transferring data on a current RAID level disk to a new RAID level disk. Fig. 8 is a flowchart of a method according to a fourth embodiment of the present invention, as shown in fig. 8, including:
step 800, judging whether the system is idle; in particular, the method comprises the following steps of,
if the current system has no external and internal reading and writing operations, judging that the system is idle, and executing the step 801 when the system is idle; otherwise, a read or write operation is performed.
Step 801, searching mapping association relation, and obtaining addresses transferred by D0, D1 and D2 after D0, D1 and D2 data on a RAID5 level disk are converted into a RAID6 level disk;
step 802, converting data on the disk of RAID5 level according to the data format of RAID6 level, transferring the data on the disk of RAID5 level after the data format conversion to the disk space corresponding to the address of the disk of RAID6 level, and generating the check information of P, Q disks on the disk of RAID 6.
And step 803, updating the address information occupied by the RAID6 level disk and the address mapping association relation.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A method for realizing RAID level conversion is characterized in that when receiving a RAID level conversion instruction, the method comprises the following steps:
judging whether the remaining available space of the system meets the requirement of RAID level conversion or not according to pre-recorded occupation information of the current RAID level disk and the remaining available space information of the system;
when the requirement of RAID level conversion is met, establishing a new RAID level disk in the residual available space of the system, and establishing a mapping incidence relation between the occupied address of the current RAID level disk and the address of the new RAID level disk to complete RAID level conversion;
the mapping association relationship specifically includes: and the incidence relation of the initial addresses of the spaces of the current RAID level disk and the new RAID level disk in each disk in the system.
2. The method of claim 1, wherein when the system remaining available space does not meet the requirements for RAID level translation, the method further comprises: determining that the level conversion fails and feeding back information of the level conversion failure to the user.
3. The method of claim 1, further comprising: when the system is in an idle state, the system is in a standby state,
converting the data on the current RAID level disk according to the data format of the new RAID level;
and transferring the data on the current RAID level disk after completing the data format conversion to a disk space corresponding to the address of the new RAID level disk according to the mapping incidence relation.
4. A method according to any one of claims 1 to 3, further comprising:
and recording the address information occupied by the new RAID level disk and the address information of the occupied space of each disk in the system.
5. The method of claim 4, wherein the method further comprises, while the transfer of data to the current RAID level disk is not complete:
when reading the service data, inquiring whether the current RAID level disk contains the service data, and if so, reading the service data; if the service data is not contained, reading the service data from the new RAID level disk according to the mapping association relation;
when the service data is written, judging whether the new RAID level disk contains enough space for writing the service data according to the initial address and the length of the written service data, and when the space for writing the service data is enough, writing the service data and updating the mapping association relationship between the occupied address of the current RAID level disk and the address of the new RAID level disk; and when the space for writing the service data is not contained enough, the service data writing failure is fed back.
6. An apparatus for implementing RAID level translation, comprising: a judging unit, a level converting unit; wherein the content of the first and second substances,
the judging unit is used for judging whether the remaining available space of the system meets the requirement of RAID level conversion or not according to the pre-recorded occupation information of the current RAID level disk and the remaining available space information of the system when receiving the RAID level conversion instruction;
the level conversion unit is used for establishing a new RAID level disk in the residual available space of the system and establishing a mapping incidence relation between the occupied address of the current RAID level disk and the address of the new RAID level disk to complete RAID level conversion when the judgment unit judges that the requirement of RAID level conversion is met;
the mapping association relationship specifically includes: and the incidence relation of the initial addresses of the spaces of the current RAID level disk and the new RAID level disk in each disk in the system.
7. The apparatus according to claim 6, further comprising a feedback unit, configured to determine that the level shift fails and feed back information of the level shift failure to a user when the determining unit determines that the remaining available space of the system does not satisfy the requirement of RAID level shift.
8. The apparatus of claim 6, further comprising a data transition transfer unit for transferring data between the first and second processors when the system is idle,
converting the data on the current RAID level disk according to the data format of the new RAID level;
and transferring the data on the current RAID level disk after completing the data format conversion to a disk space corresponding to the address of the new RAID level disk according to the mapping incidence relation.
9. The apparatus according to any one of claims 6 to 8, further comprising a recording unit configured to record occupation information of a current RAID level disk, information of remaining available space of the system, address information occupied by the new RAID level disk, and address information of occupied space of each disk in the system.
10. The apparatus of claim 9, further comprising a read and write unit to, when a transfer of data on the current RAID level disk is not complete,
when reading the service data, inquiring whether the current RAID level disk contains the service data, and if so, reading the service data; if the service data is not contained, reading the service data from the new RAID level disk according to the mapping association relationship established by the level conversion unit;
when the service data is written, judging whether the new RAID level disk contains enough space for writing the service data according to the initial address and the length of the written service data, and when the space for writing the service data is enough, writing the service data and updating the mapping incidence relation between the occupied address of the current RAID level disk of the recording unit and the address of the new RAID level disk; and when the space for writing the service data is not contained enough, the service data writing failure is fed back.
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