CN103729148A - SSD with RAID function - Google Patents

Fig. 3 (a)-3 (c) shows respectively SD card, eMMC module and mmc card schematic diagram, and above-mentioned module is included in

2;

Fig. 5 shows the storage data instance in each

24 in Fig. 4;

Fig. 7 shows

1 in Fig. 6 and the data storage example of

2;

Fig. 1 shows an an example of the present

2, and it comprises that a

20,1 is to

24, and wherein N is

20 connects each

24 by bus 23.In addition, RAID controller also connects main frame by

21.

Each

24 can be secure data card (SD), multimedia card (MMC) or embedding MMC(eMMC).In a specific embodiment, described

23 is SD buses, MMC bus, or eMMC bus, and the type decided of

24 is in the bus matching.Similarly,

21 is SCSI, IDE, ATA, SATA, PCI, PCIE, SD, MMC or eMMC interface.

In system operational process, between the

20 of

2 and

1, mutually carry out information transmit-receive.The reception of information is with the form of order and data, and data will be stored in

24 by RAID controller 20.Data show in the industry, and

20 can be managed N module efficiently.For example,

2 is RAID0 systems, and RAID controller is at two or more between driver (as the

24 of Fig. 1), carry out striping data function.For another example,

2 has RAID1 function, and RAID controller is mirror image data between two drivers (

24).Details, please respectively with reference to Fig. 6 and Fig. 7, are example here, and which kind of function of RAID controller depends on that the technology of RAIM system employing is relevant.

Traditional RAID system consists of independent disk (HDD or SSD) array, and

2 is comprised of separate, stored module array, in conjunction with RAID controller, has obvious advantage in price, volume and power consumption.These

24 are comprised of SD, MMC or eMMC: SD should meet SD relevant criterion; MMC and eMMC should meet MMC and electronic component industrial combination meeting (JEDEC) relevant criterion.

RAID controller, by

24 grouping managements, makes

2 power consumption size reductions, and therefore makes cost performance increase.For example, in Figure 4 and 5, RAID controller has the function of RAID5, and packet is divided into A1 according to 512byte size, A2, A3, B1, B2, B3 ... sequence, and

4 is used for depositing parity values, the arbitrary data bag damaging for recovering intermodule.The packet size of packet can be also 1K byte, 2K byte or other length.Compare RAID system, each

24 can be counted as independently virtual drive (virtual independent disk is called for short VID), and this makes

2 have higher reliability.For example, this system has hot plug and built-in automaticdata Restoration Mechanism, and Maintenance Engineer can replace aging eMMC or SD module by new module.For example, if the

2 of Fig. 6 is pulled out and uses new SD module to replace, the full detail of RAID

1, to new module, then recovers the state before whole RAIM system is removed to module 2.This single driver also can be as creating an efficient RAID2.

Fig. 2 show with Fig. 1 of the present invention in RAID controller example in RAIM system.Described

20 has comprised an interface protocol (IP) 201,

200,

203, and N SD, MMC, eMMC main frame 205.Described IP connects

21 and

202, to respond the information from described microprocessor 200.The message that described

202 is sent in order to receive

200, and be further connected to described RAID steering logic 203.Described

203 connects each

205, and communicates by

23 and

24.

200 executive softwares, notice IP201 removes to receive or send information to

1 and data buffer 202.IP201 controlled by

200 and

202 starts data transmission,

202 buffer memorys write

24 to or the data of reading from memory module 24.Be connected to the

203 between

202 and SD

205, by

200, control the exchanges data between

202 and SD main frame 205.Each

205 sends order by

23 and gives its connected

24, reading state data transmission.From the angle of module,

205 is exactly SD or MMC, eMMC card reader.

Fig. 3 (a)-3 (c) shows respectively the SD card being included in

2, eMMC module and mmc card.

Fig. 4 shows another example of RAID controller.RAID controller class in Fig. 4 is like the controller in Fig. 2 and Fig. 4, and

203 ˊ are steering logics of RAID5 type.

Fig. 5 shows

24 in Fig. 4 and stores the example of data.For clear,

24 is designated as 24-1,24-2,24-3 and 24-4.Data exist with the form of piece in 24-3 at 24-1, and 24-4 is as correction verification module, for storing the parity values of 24-1 to 24-3 data.Tetra-pieces of 502-508 of Fig. 5 are stored in module 24-1,24-2, and 24-3, and module 24-4 stores the parity values of each relevant block.For example, piece 502 is by A1, and A2 and A3 form, and are stored in module 24-1, and A2 exists 24-2, and A3 exists 24-3.A kind of form of verification is that A1, A2 and A3 are carried out to ORing operation, and result is stored in to correction verification module A (Ap) the inside of module 24-4.In like manner, B1, B2 and B3 are put in respectively 24-1,24-2, and 24-3, executable operations, result is put in the correction verification module B (Bp) of 24-4, and B1-B3 has formed piece 504.This is applied to piece 506 and 508 equally.

Fig. 6 shows another example of RAID controller.Except

203 〞 parts, in figure,

20 other parts is similar with

202 '.

203 〞 connect

205 by

23 and

24 is RAID1 types.

Fig. 7 shows the data storage example of

1 and

2 in Fig. 6.

203 〞 are parts of RAIM system, and the content of its data block has been mirrored.For example, in RAID1 grade, as the A1 of a part of

1 of piece or piece, and the A2 of

2 equates.In like manner, the B2 of the B1 of

1 and

2 is equal, by that analogy.

Fig. 8 has shown a system example of the present invention, and it is one, and by the SSD2 of interface 802 and main-machine communication, described interface 802 is similar to

21, and described SSD2 also can connect main frame by intermediate equipment.SSD2 connects n non-volatile memory modules (NVMs) 823 by nonvolatile module interface (NVM busses) 822, and n is integer, described NVMs respective channel 0 to n-1.

Described SSD2 comprises SSD controller 821, described SSD controller 821 comprises a CPU815, impact damper 813, a direct memory access (direct memory access, be called for short DMA) 814, one embed

816 and n

811, described

811 connects NVMs823 by bus 822.In brief, each

811 connects a NVM by independent NVM bus.

816 is embedded in SSD2, has the various functions of RAID, in its practical application, takes the form of single integrated chip or the circuit board of integrated multiple chips.Described controller is supported RAID0, in 1,2,3,4,5,6 one, and multiple grades or its integrated mode, and according to respective level or the defined rule and methodology of pattern, non-volatile

811 is carried out to reading and writing data.

82 comprises at least one

811, and normally, described

811 is more than one, for managing one group of nonvolatile memory chip.Described non-volatile

811 contains submodule or the functions such as loss equalizing algorithm, error correction algorithm (Error Correction Code is called for short ECC), scrambler generator.Normally nand flash memory of NVMs821 in described

82, can be also NOR flash memory, or phase transition storage (PCM), ferroelectric memory (F-RAM), magnetoresistive memory (MRAM).

Described system at least comprises a nonvolatile memory bus 822, normally more than one in practical application, and non-volatile

811 is by these bus 822 access datas.

During the operation of described system, CPU815 controls and drives interface 812 by interface 802 reception information (to order and the form of data), and is stored in SATA internal buffer 813 temporarily.Then,

816 is controlled DMA(Direct Memory Access, is called for short DMA) module 814, from impact damper 813, transfer data to

816, be distributed to

811, finally complete the operation of main frame save data to NVMs823.

Described

816 is configurable to support multiple RAID grade, and in an instantiation, described CPU815 is configured to some grades by

816 processed control RAID.

Fig. 9 shows another system example of the present invention, and wherein,

816 is configured to RAID1 grade.Describe similarly to Fig. 5, described

816 is by

811 toward 3 NVMs823 distributing datas, and the 4th NVM is for storage parity

816 in Fig. 9,

811, NVMs823 is consistent with Fig. 8 appropriate section.

Figure 10 shows a system example more of the present invention, and now

816 is configured to another grade RAID3.In figure, NVMs823 only comprises NVM1 and NVM2, and described

816 is at NVM1 distributing data, at NVM2 mirror image data.

1. a solid state hard disc (SSD), is characterized in that: it comprises:

A SSD controller, it connects main frame to realize information transmit-receive by interface, and described SSD controller comprises one and embeds RAID controller; With

Multiple non-volatile memory modules (NVMs), this module connects SSD controller, is embedding under the control of RAID controller information transmit-receive and storage between described SSD controller initiation and NVMs.

2. SSD according to claim 1, is characterized in that: described memory module is safe digital card (SD).

3. SSD according to claim 1, is characterized in that: described memory module is multimedia card (MMC).

4. SSD according to claim 1, is characterized in that: described memory module is to embed multimedia card (eMMC).

5. SSD according to claim 2, is characterized in that: SD module connects RAID controller by SD bus.

6. SSD according to claim 3, is characterized in that: MMC module connects RAID controller by MMC bus.

7. SSD according to claim 4, is characterized in that: eMMC module connects RAID controller by eMMC bus.

8. SSD according to claim 1, is characterized in that: data transmission interface can be SCSI, IDE, ATA, SATA, PCI, PCIE, SD, MMC or eMMC.

9. SSD according to claim 1, is characterized in that: the function of RAID controller is one of multiple RAID mode (rank), and described RAID mode (rank) comprises RAID1, RAID5 and RAID6.

10. SSD according to claim 1, is characterized in that: described RAID controller comprises the RAID steering logic being connected with multiple memory modules.

11. SSD according to claim 10, is characterized in that: RAID steering logic is connected with multiple memory modules by SD main frame or MMC/eMMC main frame.

12. SSD according to claim 1, is characterized in that: described NVMs is nand flash memory or NOR flash memory.

13. SSD according to claim 1, is characterized in that: NVMs is phase transition storage (PCM), ferroelectric memory (F-RAM) or magnetoresistive memory (MRAM).