CN103713973A - Mixed storage backup method and system based on HDD and SSD - Google Patents
Mixed storage backup method and system based on HDD and SSD Download PDFInfo
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Abstract
The invention provides a mixed storage backup method and system based on an HDD and an SSD, and relates to the technical field of computer application. The method includes the following steps that linear address space of the single HDD or multiple HDDs is divided into a plurality of parts, each part comprises a data section and an idle section, and if a writing request reaches, data are written into the corresponding data section according to a preset strategy through the HDD. According to the mixed storage backup method and system, the data on the SSD can be backed up in time through the HDD, and the mixture structure achieves reliable storage system data backup which is low in price and high in performance.
Description
Technical field
The present invention relates to Computer Applied Technology field, relate in particular to a kind of mixing storage backup method and system based on HDD and SSD.
Background technology
In recent years, the solid-state disk based on flash memory (SSD) is paid close attention to widely and is used in current storage system backup because of its superior performance, and still, because the life-span is limited, the reliability of SSD enjoys query; HDD array (RAID) is the means that a kind of traditional being used for improves reliability, but and is not suitable for SSD.First, RAID mechanism needs extra storage space to preserve check information, yet be equipped with extra SSD storage check information, can significantly increase system cost; Secondly, traditional RAID mechanism is tended to the write request that balancedly distributes between each dish, in the RAID based on SSD, this way causes the life-span loss equably of each SSD, when a certain SSD is because the life-span exhausts while breaking down, other SSD also reaches lifetime limitation, thereby may occur polydisc fault, causes loss of data.
In present stage, the problem of traditional RAID mechanism main storage system backup and SSD 3 aspects below mainly existing aspect read-write:
1, in the RAID based on SSD, because the SSD life-span of same type is substantially consistent, the loss equably of the life-span of each SSD, when a certain SSD is because the life-span exhausts while breaking down, other SSD also reaches lifetime limitation, thereby may occur polydisc fault, causes loss of data.
2, RAID mechanism needs extra storage space to preserve check information, and than HDD, SSD price is still expensive, and being equipped with extra SSD storage check information can significantly increase system cost.
3, traditional HDD cannot meet user's demand in read or write speed, and the mixing of present SSD characteristic is at a high speed used and in performance, always had some shortcomings.
Summary of the invention
The invention provides a kind of mixing storage backup method and system based on HDD and SSD, to address the above problem.
The invention provides a kind of mixing storage backup method based on HDD and SSD.Said method comprises the following steps:
The linear address space of single or multiple HDD is divided into some equal portions; Wherein, described each equal portions comprise data segment and free segment;
If when write request arrives, described HDD writes data in corresponding data segment according to preset strategy.
The present invention also provides a kind of mixing storage and backup system based on HDD and SSD, comprising: one or more HDD, one or more SSD, host side;
The read request that described host side is sent is only responded by SSD, and write request is responded by SSD and backup module simultaneously; Wherein, contain non-volatile internal memory and HDD in backup module, non-volatile internal memory is used for the delay gap of bridge joint HDD and SSD;
Described HDD writes data in corresponding data segment according to preset strategy.
By implementing technical scheme of the present invention, can back up in time the data on SSD by enough HDD, this mixed structure has been realized a kind of low price, high performance reliable memory system data back-up; The present invention adopts the gaps between their growth rates between non-volatile memory bridge HDD and SSD, has greatly improved storage system backup to the response speed of user's read-write requests and performance requirement; The present invention has also adopted a kind of I/O restructuring strategy, and this strategy can strengthen the succession of HDD built-in function, makes HDD order read-write as much as possible, strengthens the write performance of HDD; In addition, the present invention is in order to reduce the situation of the upper burst write request occurring of monolithic SSD, adopt polylith HDD backup polylith SSD, guarantee that burst on a certain SSD writes data and can disperse in time to backup in a plurality of HDD, realized a kind of low price, high performance reliable memory system backup.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Figure 1 shows that the general frame schematic diagram of the mixing storage system back mechanism of embodiments of the invention 1;
Figure 2 shows that the I/O restructuring schematic diagram in the HDD of embodiments of the invention 2;
Figure 3 shows that the collaborative backup of the polylith HDD configuration diagram of embodiments of the invention 3;
Figure 4 shows that the mixing storage backup method processing flow chart based on HDD and SSD of embodiments of the invention 4.
Embodiment
Hereinafter with reference to accompanying drawing, also describe the present invention in detail in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.
The invention provides a kind of mixing storage backup method based on HDD and SSD, comprise the following steps:
The linear address space of single or multiple HDD is divided into some equal portions; Wherein, described each equal portions comprise data segment and free segment;
If when write request arrives, described HDD writes data in corresponding data segment according to preset strategy.
Wherein, if when write request arrives, the process that described HDD writes data in corresponding data segment according to preset strategy is: if when single HDD backs up single SSD and write request arrival, described HDD writes data in corresponding data segment; Wherein, described SSD address is corresponding one by one with the address of the upper data segment of described HDD.
Wherein, when if write request arrives, the process that described HDD writes data in corresponding data segment according to preset strategy is: if when single HDD backs up single SSD and write request arrival, if data can not be write in corresponding data segment, data are write in the nearest free segment of magnetic head;
Described HDD reads data in non-volatile internal memory from described free segment when idle;
Described HDD finally writes the data in non-volatile internal memory in corresponding data segment.
Wherein, described non-volatile internal memory comprises a mapping table, and wherein, described mapping table has recorded the object free segment that described data write.
Wherein, if client is sent a plurality of write requests and target is different data segment, described a plurality of write requests are merged, write in the nearest same free segment of magnetic head.
Wherein, for a specific thread, it sends a plurality of write requests within a period of time, and these data are written in same free segment, or is written in adjacent several free segment.
Wherein, the data in several continuous free segment are read to internal memory, in internal memory, find out a plurality of write requests of certain particular thread, and these requests are reverted to a long sequence.
Wherein, if 3 write requests: request 1, request 2, request 3; Wherein, request 1 and request 3 belong to same continuous sequence, but requested 2 have interrupted, 3 requests are all written in same free segment, when the data in described free segment are read internal memory, the succession of request 1 and request 3 is restored, and when the data in internal memory are write back to HDD, a plurality of write requests is merged into a long sequence.
Wherein, according to the amount of capacity of HDD and SSD, select HDD quantity;
Described HDD becomes some equal portions according to the quantity of SSD by the spatial division of oneself, offers respectively every SSD; SSD is divided into some equal portions according to the quantity of HDD by the data of oneself, backups to respectively on every HDD.
Figure 1 shows that the general frame schematic diagram of the mixing storage system back mechanism of embodiments of the invention 1, as shown in Figure 1, with a SSD of a HDD backup, the read request that host side is sent is only responded by SSD, and write request is responded by SSD and backup module simultaneously; In backup module, contain the non-volatile internal memory of a slice and HDD, non-volatile internal memory is used for the delay gap of bridge joint HDD and SSD; Inner at HDD, the succession that a kind of I/O restructuring strategy (referring to the description of embodiment 2) strengthens operation has been proposed, make data can backup in time HDD.
Figure 2 shows that the I/O restructuring schematic diagram in the HDD of embodiments of the invention 2, I/O scheduling mechanism in monolithic HDD is as shown in Figure 2: in Fig. 2 (a), the linear address space of HDD is divided into many sections, wherein, what be labeled as D is data segment, what be labeled as F is free segment, data segment and free segment alternative arrangement in linear space, after every two data segments, there is a free segment (in real system, after dozens of data segment, just there is a free segment), the data backup of SSD is on data segment, and free segment is used for temporary transient save data.This mechanism be designed with two features: 1) data segment and free segment are distributed on HDD address space regularly, data segment is used for backing up the data of SSD, the address space that data segment forms is corresponding one by one with the address space of SSD, and this corresponding relation can directly calculate, without extra address mapping table; 2) in this mechanism, near HDD optional position, all there is a free time, when write request arrives, no matter in linear address space where magnetic head, near all there is a free segment, data can be write in this free segment in time, and any write request can be dispatched magnetic head and sequentially be completed.
Fig. 2 (b) has introduced the strategy that this sequential write request produces, a write request should be write D1, but magnetic head is in D2 position now, for fear of magnetic head scheduling, data are not directly write in D1, on the contrary, we find from the nearest free segment F3 of magnetic head, data are write wherein, like this, the data of data segment D1 are written in free segment F3, need to safeguard a this corresponding relation of table record; Free segment is interim preservation user data, and when HDD is idle, user data is transferred on data segment, and in above illustrational HDD, I/O regrouping process can be summarized as 3 steps: when 1. write request arrives, data are write in the nearest free segment of magnetic head; When 2. HDD is idle, data are read in non-volatile internal memory from free segment; 3. the data in non-volatile internal memory are finally write in corresponding data segment, the I/O operation that these 3 steps relate to is all sequentially.In the present embodiment, about the I/O restructuring strategy in HDD, mainly by two kinds of means realizations, sequentially change: be first the scheduling that reduces magnetic head, next is that a plurality of short requests are merged into a long request, and performing step is: (1), if data can be write in corresponding data segment, because SSD address is corresponding one by one with the address of the upper data segment of HDD, does not need mapping table to record this corresponding relation, on the contrary, if data can not be write in corresponding data segment, need to write in the nearest free segment of magnetic head, now, need a mapping table to record these data and write (this mapping table is kept in non-volatile internal memory) in which free segment: when write request arrives, data are written in the nearest free segment of magnetic head, avoided a magnetic head scheduling, client is often sent a plurality of write requests at short notice, if these write requests are packaged into a long request, write in same free segment, can effectively reduce the number of write operation, strengthen the succession of write operation.As shown in Fig. 2 (c), client is sent two write requests, request 1 and request 2, their target is different data segment, and now magnetic head is in D2 position, and this strategy merges these two write requests, write free segment F3(from the nearest free segment of magnetic head) in, the capacity of each section is large (being set as 2MB) in the present invention, and like this, dozens of user write request can be packaged into a long request and write in same free segment; (2) data in free segment are read to internal memory: a plurality of users can all read these data by a read operation after asking to merge and writing in same free segment, have reduced the number of times of read operation; In addition, adjacent several free segment also can together be read, and can further reduce like this probability of magnetic head scheduling, for example: 3 adjacent free segment F1, F2, F3 is read simultaneously, because these free segment are sequentially distributed on HDD space, magnetic head scheduling can be avoided; (3) data in internal memory are write back to HDD: the data in a plurality of continuous free segment are read internal memory simultaneously, these data finally can be write in data segment separately, and these data can sequentially be write in HDD; For a specific thread, it may send a plurality of write requests within a period of time, and these data are written in same free segment, or is written in adjacent several free segment.
In above-mentioned steps, data in several continuous free segment are read to internal memory, in internal memory, can find out a plurality of write requests of certain particular thread, and these requests are reverted to a long sequence, Fig. 2 (d) for example understands this process, 3 write requests, request 1, request 2 and request 3, wherein ask 1 to belong to same continuous sequence with request 3, but requested 2 have interrupted, 3 requests are all written in free segment F3, when the data in F3 are read internal memory, the succession of request 1 and request 3 is restored, so when the data in internal memory are write back to HDD, a plurality of write requests can be merged into a long sequence, reduce write operation.
Coordination mechanism between a kind of polylith HDD of embodiment of the present invention design is selected HDD quantity according to the amount of capacity of HDD and SSD, and HDD becomes some equal portions according to the quantity of SSD by the spatial division of oneself arbitrarily, offers respectively every SSD; SSD is divided into some equal portions according to the quantity of HDD by the data of oneself, backups to respectively every HDD upper, and it is upper that this mechanism can be distributed to the burst write request on specific SSD polylith HDD, thereby effectively suppress the load peak on single HDD.
The optimisation strategy of writing of monolithic HDD inside exists the space of monolithic HDD much larger than monolithic SSD, causes the waste in HDD space, and there is performance gap between HDD and SSD, if upper strata main frame sends a large amount of burst write requests, HDD can not process these data in time, cause mass data to be accumulated in internal memory, if memory pressure is excessive, SSD must stop responding user's write request, in order to address this problem, the embodiment of the present invention has designed the coordination mechanism between a kind of polylith HDD, as shown in Figure 3, 2 HDD provide backup for 3 SSD, every HDD is divided into 3 parts, back up respectively 3 data on SSD, every part is divided into data segment and free segment by address space, data segment provides backup for specific SSD, in Fig. 3, be labeled as the data segment of D1 only for SSD1, be labeled as the data segment of D2 only for SSD2, and free segment to be all SSD share, like this, no matter where magnetic head is in, for the write request of any SSD, all can backup in time near free segment magnetic head, the cooperation of a plurality of HDD of the embodiment of the present invention can be processed calmly the burst write request for certain SSD.
The mixing storage backup method processing flow chart based on HDD and SSD that Figure 4 shows that embodiments of the invention 4, comprises the following steps:
Step 401: the linear address space of single or multiple HDD is divided into some equal portions; Wherein, described each equal portions comprise data segment and free segment;
Step 402: if when write request arrives, described HDD writes data in corresponding data segment according to preset strategy.
The present invention also provides a kind of mixing storage and backup system based on HDD and SSD, comprising: one or more HDD, one or more SSD, host side;
The read request that described host side is sent is only responded by SSD, and write request is responded by SSD and backup module simultaneously; Wherein, contain non-volatile internal memory and HDD in backup module, non-volatile internal memory is used for the delay gap of bridge joint HDD and SSD;
Described HDD writes data in corresponding data segment according to preset strategy.
By implementing technical scheme of the present invention, can back up in time the data on SSD by enough HDD, this mixed structure has been realized a kind of low price, high performance reliable memory system data back-up; The present invention adopts the gaps between their growth rates between non-volatile memory bridge HDD and SSD, has greatly improved storage system backup to the response speed of user's read-write requests and performance requirement; The present invention has also adopted a kind of I/O restructuring strategy, and this strategy can strengthen the succession of HDD built-in function, makes HDD order read-write as much as possible, strengthens the write performance of HDD; In addition, the present invention is in order to reduce the situation of the upper burst write request occurring of monolithic SSD, adopt polylith HDD backup polylith SSD, guarantee that burst on a certain SSD writes data and can disperse in time to backup in a plurality of HDD, realized a kind of low price, high performance reliable memory system backup.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the mixing storage backup method based on HDD and SSD, is characterized in that, comprises the following steps:
The linear address space of single or multiple HDD is divided into some equal portions; Wherein, described each equal portions comprise data segment and free segment;
If when write request arrives, described HDD writes data in corresponding data segment according to preset strategy.
2. method according to claim 1, is characterized in that, if when write request arrives, the process that described HDD writes data in corresponding data segment according to preset strategy is:
If when single HDD backs up single SSD and write request arrival, described HDD writes data in corresponding data segment; Wherein, described SSD address is corresponding one by one with the address of the upper data segment of described HDD.
3. method according to claim 1, is characterized in that, if when write request arrives, the process that described HDD writes data in corresponding data segment according to preset strategy is:
If when single HDD backs up single SSD and write request arrival, if data can not be write in corresponding data segment, data are write in the nearest free segment of magnetic head;
Described HDD reads data in non-volatile internal memory from described free segment when idle;
Described HDD finally writes the data in non-volatile internal memory in corresponding data segment.
4. method according to claim 3, is characterized in that, described non-volatile internal memory comprises a mapping table, and wherein, described mapping table has recorded the object free segment that described data write.
5. method according to claim 4, is characterized in that,
If client is sent a plurality of write requests and target is different data segment, described a plurality of write requests are merged, write in the nearest same free segment of magnetic head.
6. method according to claim 4, is characterized in that,
For a specific thread, it sends a plurality of write requests within a period of time, and these data are written in same free segment, or is written in adjacent several free segment.
7. method according to claim 6, is characterized in that,
Data in several continuous free segment are read to internal memory, in internal memory, find out a plurality of write requests of certain particular thread, and these requests are reverted to a long sequence.
8. method according to claim 7, is characterized in that,
If 3 write requests: request 1, request 2, request 3; Wherein, request 1 and request 3 belong to same continuous sequence, but requested 2 have interrupted;
3 requests are all written in same free segment, and when the data in described free segment are read internal memory, the succession of request 1 and request 3 is restored, and when the data in internal memory are write back to HDD, a plurality of write requests is merged into a long sequence.
9. method according to claim 1, is characterized in that,
According to the amount of capacity of HDD and SSD, select HDD quantity;
Described HDD becomes some equal portions according to the quantity of SSD by the spatial division of oneself, offers respectively every SSD; SSD is divided into some equal portions according to the quantity of HDD by the data of oneself, backups to respectively on every HDD.
10. the mixing storage and backup system based on HDD and SSD, is characterized in that, comprising: one or more HDD, one or more SSD, host side;
The read request that described host side is sent is only responded by SSD, and write request is responded by SSD and backup module simultaneously; Wherein, contain non-volatile internal memory and HDD in backup module, non-volatile internal memory is used for the delay gap of bridge joint HDD and SSD;
Described HDD writes data in corresponding data segment according to preset strategy.
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