CN107193758A - The mapping table management method and solid state hard disc of a kind of solid state hard disc - Google Patents
The mapping table management method and solid state hard disc of a kind of solid state hard disc Download PDFInfo
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- CN107193758A CN107193758A CN201710357792.1A CN201710357792A CN107193758A CN 107193758 A CN107193758 A CN 107193758A CN 201710357792 A CN201710357792 A CN 201710357792A CN 107193758 A CN107193758 A CN 107193758A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/0802—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches
- G06F12/0866—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches for peripheral storage systems, e.g. disk cache
- G06F12/0871—Allocation or management of cache space
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0238—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
- G06F12/0246—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory in block erasable memory, e.g. flash memory
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/0292—User address space allocation, e.g. contiguous or non contiguous base addressing using tables or multilevel address translation means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/0802—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches
- G06F12/0893—Caches characterised by their organisation or structure
- G06F12/0895—Caches characterised by their organisation or structure of parts of caches, e.g. directory or tag array
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/10—Providing a specific technical effect
- G06F2212/1016—Performance improvement
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/10—Providing a specific technical effect
- G06F2212/1032—Reliability improvement, data loss prevention, degraded operation etc
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/10—Providing a specific technical effect
- G06F2212/1032—Reliability improvement, data loss prevention, degraded operation etc
- G06F2212/1036—Life time enhancement
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/10—Providing a specific technical effect
- G06F2212/1041—Resource optimization
- G06F2212/1044—Space efficiency improvement
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/10—Providing a specific technical effect
- G06F2212/1052—Security improvement
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/21—Employing a record carrier using a specific recording technology
- G06F2212/214—Solid state disk
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/22—Employing cache memory using specific memory technology
- G06F2212/222—Non-volatile memory
Abstract
The invention discloses the mapping table management method and solid state hard disc of a kind of solid state hard disc, it is characterized in that increasing SCM in solid state hard disc, SCM as solid state hard disc data buffer storage, is created and stored in SCM by hard disk controller for recording the mapping table of mapping relations for the logical address that NAND specific physical address is accessed with main frame；Main frame to solid state disk write enter host data when, first write SCM realize data buffer storage, the data being buffered in SCM it is actual renewal to synchronized update mapping table after NAND or write-in SCM realize data buffer storage when synchronized update mapping table.By being changed to mapping table to be stored in SCM, memory map assignments are no longer needed in NAND, it is to avoid to the occupancy in NAND spaces, so avoid due to frequent updating mapping table cause the problem of writing amplification.The operation that start loads initial mapping table from NAND is also reduced simultaneously, significantly reduces start operating lag.
Description
Technical field
The present invention relates to solid state hard disc control technology, the mapping table management method and solid-state of more particularly to a kind of solid state hard disc
Hard disk.
Background technology
Fig. 1 is typical NAND composition schematic diagrams：DIE, can independent concurrent operations unit；Block, can independently be wiped
Unit, has to wipe whole Block after data write-in of each physical location in it before write next time；Page, reads
R/w cell.
SSD (solid state hard disc) has been widely used in various occasions, and it is progressively replacing traditional HDD storage devices.
In order to obtain the concurrent writing speeds of NAND of maximum, it is necessary to safeguard the caching Cache of user data in internal memory (DRAM), slow
The concurrently write-in initiated again after enough data to NAND is deposited, so as to obtain highest performance.Power down volatibility is saved as due to interior
Equipment, the SSD systems based on this conceptual design, after a power failure the data in Cache can lose completely, cause user data to damage
It is bad.
Fig. 2 is using conventional mapping table administrative mechanism schematic diagram；Most of SSD internal mapping tables management strategies are at present：
A mapping table is safeguarded in internal memory, the logical address for describing main frame access unit is closed to the physical address map stored on NAND
System；The data of main frame access unit logical address 3 are stored in physical address D, during data are written to NAND, while
Mapping table can be updated；NAND is divided into two parts, part storage data, part storage mapping table；Because mapping table can fall
Electricity is lost, in order to accelerate start process, it is necessary to which mapping table is regularly flushed to NAND designated areas；Deposit and reflect on NAND
The region of firing table, with the growth of use time, its space taken is increasing, it is necessary to carry out garbage reclamation, process companion
As new NAND writes；Simultaneously because NAND needs the change of memory map assignments, so result in extra amplification of writing, influence
SSD life-span and performance.
Further, after system power failure is re-powered, because the data in internal memory have been lost, it is therefore desirable to first from NAND
Storage region scans, loads mapping table to DRAM, and host access request thereafter can just take corresponding mapping item, cause out
The problem of response time is slow after machine.
The content of the invention
For disadvantages described above, the present invention seeks to can continue to preserve using SCM power failure datas and can byte manipulation characteristic,
Improve performance and the life-span of solid state hard disc.
In order to solve the mapping table management method that the problem above present invention proposes a kind of solid state hard disc, it is characterised in that
Increase SCM in solid state hard disc, hard disk controller using SCM as solid state hard disc data buffer storage, the specific physics for recording NAND
The mapping table of the mapping relations for the logical address that address is accessed with main frame is created and stored in SCM；Main frame is to solid state disk write
When entering host data, first write SCM and realize data buffer storage, the data being buffered in SCM are actual to be updated to synchronized update after NAND
Mapping table is writing synchronized update mapping table when SCM realizes data buffer storage.
The mapping table management method of described solid state hard disc, it is characterised in that in the garbage reclamation processing routine of solid state hard disc
Or need to increase the operation that correspondence updates mapping table in defragmenter.
The mapping table management method of described solid state hard disc, it is characterised in that the NAND of logical address mapping specific physics
When address changes, the data byte in mapping table where corresponding physical address is directly changed.
The mapping table management method of described solid state hard disc, it is characterised in that host data write-in SCM is realized that data are delayed
When depositing, the address information of host data is write into SCM according to form set in advance.
The mapping table management method of described solid state hard disc, it is characterised in that complete data write-in behaviour in accordance with the following steps
Make：
Step 1：What hard disk controller received that main frame issues writes data command；
Step 2：Cache is distributed in free space in SCM, by host data, address information and validity flag
Write cache；
Step 3：Whether more new procedures meet in running background, timing or the random data for judging to be cached in SCM that are triggered
NAND concurrency programmings condition or condition set in advance, trigger to update the data cached in SCM if meeting and arrive solid-state
The NAND memory cell of hard disk.
The mapping table management method of described solid state hard disc, it is characterised in that the SCM is divided with fixing entry size, with
Entry is that smallest allocation unit is scheduled；Each entry sets a validity flag；When host data is cached to entry,
The validity flag is denoted as effective Y；It is described effective when the data stored in entry are updated to NAND memory cell
Property mark is flagged as invalid N.
The mapping table management method of described solid state hard disc, it is characterised in that also including power-on self-test program, the upper electricity
Each entry of automatically scanning SCM when self-check program is electric on solid state hard disc, valid flag is updated for effective Y data and arrives NAND
Memory cell.
A kind of solid state hard disc, it is characterised in that employ the mapping of the solid state hard disc described in claim 1 to 7 any one
Table management method.
The present invention substitutes DRAM as mapped memory region by using SCM, will because SCM power failure datas can continue to preserve
Mapping table is changed to be stored in SCM, and memory map assignments are no longer needed in NAND, it is to avoid to the occupancy in NAND spaces, and then kept away
Exempted from due to frequent updating mapping table cause the problem of writing amplification.Start is also reduced simultaneously loads initial mapping table from NAND
Operation, significantly reduce start operating lag.
Brief description of the drawings
Fig. 1 is typical NAND composition schematic diagrams；
Fig. 2 is to use conventional memory mapping table administrative mechanism schematic diagram；
Fig. 3 is the mapping table administrative mechanism schematic diagram after being stored using SCM；
Fig. 4 is the schematic diagram that data cached write-in is realized using SCM.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 3 is the mapping table administrative mechanism schematic diagram after being stored using SCM, introduces SCM and replaces after DRAM, due to SCM tools
The characteristic that standby byte is programmed, data are kept after power down, in the present invention we mapping table is deposited in SCM and eliminated on NAND
The space of memory map assignments, is all stored as user data；Therefore it is stored in NAND, can keeps away compared to original drop mapping table
Exempt from based on NAND deposit map when bring write amplification, improve SSD reliabilities.When main frame writes the data of logical address,
The corresponding list item of mapping table in SCM is then changed, corresponding NAND physical address is write data into；When main frame is read logically
During the data of location, then the corresponding list item of mapping table in SCM is inquired about, obtain data from corresponding NAND physical address and return to master
Machine；After generation power down is re-powered, the mapping table in SCM is still had, and the read-write requests for main frame can be responded at once, and
Mapping need not be recovered from NAND, start operating lag is significantly reduced.
Fig. 4 is to realize the schematic diagram of data cached write-in using SCM, and what hard disk controller received that main frame issues writes data
Instruction；Cache is distributed in free space in SCM, host data, address information and validity flag are write and cached
Internal memory；Data buffer storage is completed, and notifies host data write-in to complete.More new procedures are in running background, at random timing or quilt
Triggering judges whether the data cached in SCM meet NAND concurrency programmings condition or condition set in advance, if meeting
Trigger the NAND memory cell data cached in SCM updated to solid state hard disc.The write-in of real data is finally completed, and more
New corresponding mapping table, the more new procedures do not influence response time and the Consumer's Experience of main frame in running background.
Management can fix SCM entry size division for convenience, be scheduled by smallest allocation unit of entry；Often
Individual entry sets a validity flag Valid Flag；When host data is cached to entry, validity flag is denoted as
Effective Y；When the data stored in entry are updated to NAND memory cell, the validity flag is flagged as invalid N.
When improvement maximum compared to DRAM SCM is exactly that powered-off fault occurs for its system, part may be also cached in SCM
The user data in NAND is not updated, for also including power-on self-test program, upper electricity in the problem solid state hard disc control program
Each entry of automatically scanning SCM when self-check program is electric on solid state hard disc, valid flag is updated for effective Y data and arrives NAND
Memory cell.So as to ensure SCM in system power failure, the data in SCM can continue to preserve and recover.Ensure the safety of data.
Above disclosed is only an embodiment of the present invention, can not limit the interest field of sheet with this certainly,
One of ordinary skill in the art will appreciate that all or part of flow of above-described embodiment is realized, and according to the claims in the present invention institute
The equivalent variations of work, still fall within the scope that the present invention is covered.
Claims (8)
1. the mapping table management method of a kind of solid state hard disc, it is characterised in that increase SCM in solid state hard disc, hard disk controller will
SCM is as solid state hard disc data buffer storage, the mapping for recording the logical address that NAND specific physical address is accessed with main frame
The mapping table of relation is created and stored in SCM；Main frame to solid state disk write enter host data when, first write SCM realize data
Caching, the actual renewal of data being buffered in SCM realizes data buffer storage to synchronized update mapping table after NAND or in write-in SCM
When synchronized update mapping table.
2. the mapping table management method of solid state hard disc according to claim 1, it is characterised in that in the rubbish of solid state hard disc
Need to increase the operation that correspondence updates mapping table in recycling program or defragmenter.
3. the mapping table management method of solid state hard disc according to claim 2, it is characterised in that logical address mapping
When NAND specific physical address changes, the data byte in mapping table where corresponding physical address is directly changed.
4. the mapping table management method of the solid state hard disc according to claims 1 to 3 any one, it is characterised in that by main frame
When data write-in SCM realizes data buffer storage, the address information of host data is write into SCM according to form set in advance.
5. the mapping table management method of solid state hard disc according to claim 4, it is characterised in that complete in accordance with the following steps
Data write operation：
Step 1：What hard disk controller received that main frame issues writes data command；
Step 2：Cache is distributed in free space in SCM, host data, address information and validity flag are write
Cache；
Step 3：Whether more new procedures meet NAND in running background, timing or the random data for judging to be cached in SCM that are triggered
Concurrency programming condition or condition set in advance, trigger to update the data cached in SCM if meeting and arrive solid state hard disc
NAND memory cell.
6. the mapping table management method of solid state hard disc according to claim 5, it is characterised in that the SCM is to fix entry
Size is divided, and is scheduled by smallest allocation unit of entry；Each entry sets a validity flag；When host data is slow
When being stored to entry, the validity flag is denoted as effective Y；When the data stored in entry are updated to NAND memory cell
Shi Suoshu validity flags are flagged as invalid N.
7. the mapping table management method of solid state hard disc according to claim 5, it is characterised in that also including power-on self-test journey
Sequence, each entry of automatically scanning SCM when the power-on self-test program is electric on solid state hard disc, by the number that valid flag is effective Y
NAND memory cell is arrived according to updating.
8. a kind of solid state hard disc, it is characterised in that employ the mapping table of the solid state hard disc described in claim 1 to 7 any one
Management method.
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| CN107844431A (en) * | 2017-11-03 | 2018-03-27 | 合肥兆芯电子有限公司 | Map table updating method, memorizer control circuit unit and memory storage apparatus |
| CN107861841A (en) * | 2017-11-07 | 2018-03-30 | 郑州云海信息技术有限公司 | The management method and system that data map in a kind of SSD Cache |
| CN108021512A (en) * | 2017-11-22 | 2018-05-11 | 深圳忆联信息系统有限公司 | A kind of solid state hard disc mapping management process and solid state hard disc |
| CN108255426A (en) * | 2017-12-29 | 2018-07-06 | 北京联想核芯科技有限公司 | A kind of data processing method and device of SSD hard disks |
| CN109271329A (en) * | 2018-09-01 | 2019-01-25 | 苏州韦科韬信息技术有限公司 | A method of it improves and rebuilds non-mapping table efficiency |
| CN109637438A (en) * | 2019-02-22 | 2019-04-16 | 上海艾为电子技术股份有限公司 | A kind of update method of display control parameter, driving chip |
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| CN107861841A (en) * | 2017-11-07 | 2018-03-30 | 郑州云海信息技术有限公司 | The management method and system that data map in a kind of SSD Cache |
| CN107861841B (en) * | 2017-11-07 | 2022-04-22 | 郑州云海信息技术有限公司 | Management method and system for data mapping in SSD (solid State disk) Cache |
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