2-ch RAID0 Design (NVMe-IP) reference design manual
■ RAID0 system uses multiple storages to extend total storage capacity and increase write/read performance. Assumed that total number of devices connecting in RAID0 system is N, total storage capacity of RAID0 is equal to N times of one device capacity. Write and read performance of RAID0 are almost equal to N times of one device performance.
■ Data format of RAID0 is shown in Figure 1-1. Data stream of the host side is split into a small stripe for transferring with one SSD at a time. Stripe size is the data size transferring with one SSD before switching to other SSDs. In RAID0 reference design, stripe size is equal to 512 byte.
■ In this demo, two SSDs are connected in the system . It is recommended to use the same model of SSD for all channels to match the characteristic and achieve the best performance. As a result, the total capacity is equal to two times of one SSD and the write/read performance are almost two times of one SSD performance.
■ The demo uses FIFO implemented by BlockRAM to be the buffer which has smaller size than using DDR. Therefore, the buffer is sometimes not ready to transfer data when SSD pauses data transmission for long time in Write process. Test performance in the demo is average speed , not sustain rate . User can modify RAID0 reference design by increasing the numbers of SSD to achieve the better performance and the bigger capacity. Furthermore, user can add DDR to be data buffer in the system for supporting high-speed transferring as sustain rate.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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1-Jul-21 |
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Rev1.4 |
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1.3 MB |
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