CN105630691A - MRAM-using solid state hard disk and physical address-using reading/writing method - Google Patents
MRAM-using solid state hard disk and physical address-using reading/writing method Download PDFInfo
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- CN105630691A CN105630691A CN201510214797.XA CN201510214797A CN105630691A CN 105630691 A CN105630691 A CN 105630691A CN 201510214797 A CN201510214797 A CN 201510214797A CN 105630691 A CN105630691 A CN 105630691A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention provides a solid state hard disk. The solid state hard disk comprises a main control chip, a group of NAND chips and an MRAM, wherein the NAND chips are used for storing data and are connected with the main control chip; the MRAM is connected with the main control chip; and the MRAM comprises a read/write cache. According to the solid state hard disk and a physical address-using reading/writing method provided by the invention, the MRAM comprises the read/write cache, so that the read/write performance can be ensured; a DDR DRAM is not used, and expensive and large-volume outage protection equipment is not needed, so that the cost and power consumption of the solid state hard disk are reduced; by using a host file system to process a logic address and physical address comparison list, the whole performance of the system is improved without loss; and the random read/write performance is not sacrificed and a lot of internal memory in the host is consumed, so that the scheme is more suitable for servers.
Description
Technical field
The present invention relates to solid state hard disc, particularly relate to a kind of solid state hard disc using MRAM and use the reading/writing method of physical address.
Background technology
Currently, the development of nand flash memory technology has promoted SSD industry. As it is shown in figure 1, use the technology such as HSSI High-Speed Serial Interface such as SATA, PICe between SSD and main frame. Internal by being used for storing one group of NAND chip of data, for supporting to calculate and data cached DDRDRAM (internal memory), and main control chip (SSDController) composition. Sometimes also need to circuit breaking protective system.
NAND is the storage device of a kind of monoblock read-write, and the unit that minimum readable takes is page, and minimum erasable unit is block, and a block is often made up of a lot of page, and after block erasing, the page of the inside can carry out independent write operation. Write operation is very slow, more more slowly than reading, and it is more more slowly than write to wipe operation.
As in figure 2 it is shown, mobile phone is as follows with the file operation mode of computer:
(1) application software send to operating system open, close, reading and writing file instruction;
(2) file system portion in operating system is the instruction morphing instruction for reading and writing memory block of reading and writing file;
(3) NAND drives and manages software and accepts the instruction in read-write memory block district, carries out buffer memory, writes the optimizations such as equilibrium, sends to chip and read page, write the instructions such as block.
In mobile phone, NAND drives with management software usually used as the software module being closely related with operating system, runs on host chip; In a computer, NAND drives and generally runs on the main control chip of solid state hard disc with management software.
One problem of nand flash memory is that NAND has the limited life-span. The inside each page through certain number of times erasable after, will permanent failure can not be continuing with. The current trend of industry development is the capacity of NAND and packing density increases very fast, but to reduce the life-span for cost. Erasable number of times is reduced to about current 3000 time from initial 100,000 times.
Because the above characteristic of nand flash memory, it is complicated that the NAND within SSD manages comparison. In order to not make some that the block premature deterioration of write operation often occurs, it is necessary to carry out writing equilibrium treatment. Logical address and physical address that file system software identifies are different, it is necessary to a table is mapped the two. Owing to NAND erasing is too slow, not updating in original block district, but new content is write a Ge Xinkuai district during general amendment one content, it is invalid that Jiu Kuai district is labeled as, and waits the CPU free time to get off to wipe it again. So, the synopsis of logical address physical address is constantly dynamically to update. This table is proportional to the total capacity of SSD, exists in DDRDRAM, additionally also has corresponding labelling inside NAND. Along with the increasing sharply of SSD capacity on market, this telogenesis is the consumer that DRAM is maximum.
Owing to the read or write speed of NAND is more more slowly than DRAM, it is also possible to utilize a part of dram space to make the buffer memory (Cache) of reading and writing, improve the performance of whole SSD. But introducing is write buffer memory and is created new problem: once there is power-off, the content not yet writing NAND in DRAM cache can be lost, and causes the damage of the even whole file system of system loss data. So costliness, bulky circuit breaking protective system (being generally made up of battery or substantial amounts of capacitor) must be used simultaneously. And logical-physical address synopsis, after there is power-off, the data being available with in NAND re-construct, although time consuming.
From described above it can be seen that the design of SSD encounters awkward: writing buffer memory if do not used, the write performance of product is had a greatly reduced quality; If using and writing buffer memory, it is necessary to use costliness to account for again the power-off protection equipment of volume, cause cost effectiveness very poor simultaneously.
A kind of solid state hard disc mixing use DRAM and MRAM, MRAM is used for writing buffer memory, DRAM is used for preserving logical address and physical address synopsis, as shown in Figure 3, owing to MRAM can forever retain data after a loss of power as Flash flash memory, not in use by expensive, bulky circuit breaking protective system, reduce the cost of solid state hard disc; On the other hand the logical-physical address synopsis consuming internal memory maximum being saved in less costly DRAM, reduce further the cost of solid state hard disc, thus improve the cost effectiveness of solid state hard disc.
But DRAM power consumption is relatively big, also has extra cost, therefore in the application that power consumption requirements is very strict, for instance, such scheme can not meet application demand.
Therefore, those skilled in the art is devoted to develop the solid state hard disc that a kind of cost effectiveness is high and low in energy consumption, can either ensure write performance, can reduce again solid state hard disc cost, and power consumption is relatively low simultaneously.
Summary of the invention
Because the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of solid state hard disc, can either ensure write performance, can reduce again solid state hard disc cost, and power consumption is relatively low simultaneously.
MRAM is a kind of new internal memory and memory technology, it is possible to quick random read-write as SRAM/DRAM, it is also possible to forever retain data as Flash flash memory after a loss of power.
If operating speed is fast and keeps the MRAM of content to replace DRAM after power-off, no doubt can ensure that write performance, but in following significant period of time, MRAM still can be expensive, therefore uses substantial amounts of MRAM can dramatically increase the cost of solid state hard disc equally.
If MRAM is used as the logical address writing buffer memory and NAND chip and physical address synopsis buffer memory, and the logical address taking the NAND chip of big quantity space is still saved in NAND chip with physical address synopsis, thus can use the MRAM that capacity is less, write performance can either be ensured, can reducing again solid state hard disc cost, power consumption is relatively low simultaneously.
The present invention also provides for the present invention and also provides for the write method using the reading method of physical address and the use physical address of a kind of solid state hard disc of a kind of solid state hard disc.
The present invention provides a kind of solid state hard disc, and including main control chip, for storing one group of NAND chip of data, NAND chip is connected with main control chip, and solid state hard disc also includes MRAM, MRAM and is connected with main control chip, and MRAM includes read-write cache.
Solid state hard disc provided by the invention, MRAM includes read-write cache, it is possible to ensure write performance; Owing to not using DDRDRAM, it is not necessary to use costliness to account for again the power-off protection equipment of volume, reduce the cost of solid state hard disc, reduce the power consumption of solid state hard disc simultaneously; MRAM includes logical address and physical address synopsis buffer memory, it is possible to use MRAM process logical address and physical address synopsis that capacity is less, extends the NAND life-span further cost reducing solid state hard disc simultaneously reducing the number of times writing NAND.
Further, MRAM is connected with the main control chip of solid state hard disc by DDRDRAM interface.
Further, MRAM is integrated in the main control chip of solid state hard disc.
The present invention also provides for a kind of reading method using physical address of solid state hard disc, comprises the following steps:
(1) file system receives reading NAND page instruction;
(2) logical page number (LPN) according to NAND page, the logical address in host memory is with physical address synopsis, and inquiry obtains corresponding physical address;
(3) search for the NAND page to read whether in read-write cache according to physical address, if in read-write cache, from read-write cache, read data, perform step (5); If not in read-write cache, perform step (4);
(4) from NAND chip, read the data of NAND page, and be stored in read-write cache; If the free page of described read-write cache is less than the first warning value, begin a clean up read-write cache;
(5) read operation terminates.
Using host file system to process logical address and physical address synopsis, the overall performance of system does not only lose and is improved on the contrary.
Further, in step (2), logical address and physical address synopsis are when start, file system read host memory from NAND.
Adopting this scheme, owing to reading in host memory by whole logical address and physical address synopsis, will not sacrifice random read-write performance, but to consume a large amount of internal memories in main frame, therefore this scheme is more suitable for server.
Further, in step (2), logical address and physical address synopsis are when shutdown or during Host Idle, file system write back NAND.
Further, in step (2), logical address and physical address synopsis are when shutdown or during Host Idle, file system the renewal part of logical address Yu physical address synopsis is write back NAND.
The present invention also provides for the write method using physical address of a kind of solid state hard disc, comprises the following steps:
(1) file system receives and writes NAND page instruction;
(2) logical page number (LPN) according to NAND page, the logical address in host memory is with physical address synopsis, and inquiry obtains corresponding physical address;
(3) search for NAND page whether in read-write cache according to physical address, if in read-write cache, perform step (5); If not in read-write cache, perform step (4);
(4) by the free page of the data write read-write cache write in NAND page instruction; If the free page of read-write cache is less than the first warning value, begin a clean up described read-write cache, perform step (6);
(5) by the corresponding page of the data write read-write cache write in NAND page instruction;
(6) write operation terminates.
Compared with prior art, solid state hard disc provided by the invention and reading/writing method have the advantages that
(1) MRAM includes read-write cache, it is possible to ensure readwrite performance;
(2) owing to not using DDRDRAM, it is not necessary to use costliness to account for again the power-off protection equipment of volume, reduce the cost of solid state hard disc, reduce the power consumption of solid state hard disc simultaneously;
(3) using host file system to process logical address and physical address synopsis, the overall performance of system does not only lose and is improved on the contrary;
(4) will not sacrificing random read-write performance, but to consume a large amount of internal memories in main frame, therefore this scheme is more suitable for server.
Below with reference to accompanying drawing, the technique effect of the design of the present invention, concrete structure and generation is described further, to be fully understood from the purpose of the present invention, feature and effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of solid state hard disc in prior art;
Fig. 2 is prior art file operational flowchart;
Fig. 3 is the structural representation of the solid state hard disc that mixing uses DRAM and MRAM in prior art;
Fig. 4 is the structural representation of the solid state hard disc of one embodiment of the present of invention;
Fig. 5 is the flow chart of the read operation using physical address of the solid state hard disc shown in Fig. 4;
Fig. 6 is the flow chart of the write operation using physical address of the solid state hard disc shown in Fig. 4;
Fig. 7 is the structural representation of the solid state hard disc of an alternative embodiment of the invention.
Detailed description of the invention
As shown in Figure 4, the solid state hard disc of one embodiment of the present of invention, including main control chip, for storing one group of NAND chip of data, NAND chip is connected with main control chip, and solid state hard disc also includes MRAM, MRAM and is connected with main control chip, and MRAM includes read-write cache.
MRAM is connected with the main control chip of solid state hard disc by DDRDRAM interface.
NAND chip stores logical address and physical address synopsis, when start, file system reads host memory from NAND. Adopting this scheme, owing to reading in host memory by whole logical address and physical address synopsis, will not sacrifice random read-write performance, but to consume a large amount of internal memories in main frame, therefore this scheme is more suitable for server.
Logical address and physical address synopsis, when shutdown or during Host Idle, are write back NAND by file system. Preferably, when shutdown or during Host Idle, file system the renewal part of logical address Yu physical address synopsis is write back NAND.
The reading method using physical address of the solid state hard disc in the present embodiment, as it is shown in figure 5, comprise the following steps:
(1) file system receives reading NAND page instruction;
(2) logical page number (LPN) according to NAND page, the logical address in host memory is with physical address synopsis, and inquiry obtains corresponding physical address;
(3) search for the NAND page to read whether in read-write cache according to physical address, if in read-write cache, from read-write cache, read data, perform step (5); If not in read-write cache, perform step (4);
(4) from NAND chip, read the data of NAND page, and be stored in read-write cache; If the free page of described read-write cache is less than the first warning value, begin a clean up read-write cache; During cleaning read-write cache, page relatively low to the page for a long time do not read and not write or read-write frequency being cleared out from buffer memory, the page revised needs to write back in NAND.
(5) read operation terminates.
The processing method of logical address and physical address synopsis:
(1), during start, host file system, by logical address and physical address synopsis, is read in the internal memory of main frame from the NAND of solid state hard disc according to the physical address of both sides' agreement;
(2) when system is run, host file system is responsible for safeguarding more new logical addresses and physical address synopsis, and at one's leisure the renewal part of logical address Yu physical address synopsis is write back in the NAND of solid state hard disc, write back the operation of NAND each time, main frame must select a new idle NAND page according to the principle writing equilibrium, and with the physical address of this page more new logical addresses and physical address synopsis;
(3), before shutdown, main frame writes back to the renewal part of all logical addresses Yu physical address synopsis in the NAND of solid state hard disc.
The write method using physical address of the solid state hard disc in the present embodiment, as shown in Figure 6, comprises the following steps:
(1) file system receives and writes NAND page instruction;
(2) logical page number (LPN) according to NAND page, the logical address in host memory is with physical address synopsis, and inquiry obtains corresponding physical address;
(3) search for NAND page whether in read-write cache according to physical address, if in read-write cache, perform step (5); If not in read-write cache, perform step (4);
(4) by the free page of the data write read-write cache write in NAND page instruction; If the free page of read-write cache is less than the first warning value, begin a clean up read-write cache, perform step (6);
(5) by the corresponding page of the data write read-write cache write in NAND page instruction;
(6) write operation terminates.
As it is shown in fig. 7, the solid state hard disc of one embodiment of the present of invention, including main control chip, for storing one group of NAND chip of data, NAND chip is connected with main control chip, and solid state hard disc also includes MRAM, MRAM and is connected with main control chip, and MRAM includes read-write cache.
MRAM is integrated in the main control chip of solid state hard disc.
The reading/writing method of solid state hard disc provided by the invention and use physical address, MRAM includes read-write cache, it is possible to ensure readwrite performance; Owing to not using DDRDRAM, it is not necessary to use costliness to account for again the power-off protection equipment of volume, reduce the cost of solid state hard disc, reduce the power consumption of solid state hard disc simultaneously; Using host file system to process logical address and physical address synopsis, the overall performance of system does not only lose and is improved on the contrary; Will not sacrificing random read-write performance, but to consume a large amount of internal memories in main frame, therefore this scheme is more suitable for server.
The preferred embodiment of the present invention described in detail above. Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work. Therefore, all technical staff in the art, all should in the protection domain being defined in the patent claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (8)
1. a solid state hard disc, including main control chip, for storing one group of NAND chip of data, described NAND chip is connected with described main control chip, it is characterized in that, described solid state hard disc also includes MRAM, and described MRAM is connected with described main control chip, and described MRAM includes read-write cache.
2. solid state hard disc as claimed in claim 1, it is characterised in that described MRAM is connected with the main control chip of described solid state hard disc by DDRDRAM interface.
3. solid state hard disc as claimed in claim 1, it is characterised in that described MRAM is integrated in the main control chip of described solid state hard disc.
4. the reading method using physical address of the solid state hard disc as described in claim 1-3, comprises the following steps:
(1) file system receives reading NAND page instruction;
(2) logical page number (LPN) according to described NAND page, the logical address in host memory is with physical address synopsis, and inquiry obtains corresponding physical address;
(3) search for the NAND page to read whether in described read-write cache according to described physical address, if in described read-write cache, from described read-write cache, read data, perform step (5); If not in described read-write cache, perform step (4);
(4) from NAND chip, read the data of described NAND page, and be stored in described read-write cache; If the free page of described read-write cache is less than the first warning value, begin a clean up read-write cache;
(5) read operation terminates.
5. the reading method using physical address as claimed in claim 4, it is characterised in that in step (2), logical address and physical address synopsis are when start, file system read host memory from NAND.
6. the as claimed in claim 5 reading method using physical address, it is characterised in that in step (2), logical address and physical address synopsis are when shutdown or during Host Idle, file system write back NAND.
7. the reading method using physical address as claimed in claim 5, it is characterized in that, in step (2), logical address and physical address synopsis are when shutdown or during Host Idle, file system the renewal part of logical address Yu physical address synopsis is write back NAND.
8. the write method using physical address of the solid state hard disc as described in claim 1-3, comprises the following steps:
(1) file system receives and writes NAND page instruction;
(2) logical page number (LPN) according to described NAND page, the logical address in host memory is with physical address synopsis, and inquiry obtains corresponding physical address;
(3) search for described NAND page whether in read-write cache according to described physical address, if in described read-write cache, perform step (5); If not in described read-write cache, perform step (4);
(4) data write in NAND page instruction are write in the free page of described read-write cache; If the free page of described read-write cache is less than the first warning value, begin a clean up described read-write cache, perform step (6);
(5) data write in NAND page instruction are write in the corresponding page of described read-write cache;
(6) write operation terminates.
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| CN106502584A (en) * | 2016-10-13 | 2017-03-15 | 记忆科技(深圳)有限公司 | A kind of method of the utilization rate for improving solid state hard disc write buffer |
| CN107273306A (en) * | 2017-06-19 | 2017-10-20 | 郑州云海信息技术有限公司 | A kind of digital independent of solid state hard disc, method for writing data and solid state hard disc |
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| CN108762989A (en) * | 2018-06-05 | 2018-11-06 | 郑州云海信息技术有限公司 | Date storage method, device, equipment and the readable storage medium storing program for executing of solid state disk |
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| CN113760796A (en) * | 2021-09-01 | 2021-12-07 | 山东华芯半导体有限公司 | SSD solid state dish based on HBM cache |
| WO2024012093A1 (en) * | 2022-07-13 | 2024-01-18 | 北京超弦存储器研究院 | Ssd, main control chip of ssd, and resource management method for ssd |
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Application publication date: 20160601 |