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 device is N, total storage capacity is equal to N multiply by amount of storage. Write and read speed of RAID0 are almost equal to N multiply by speed of one SSD.
■Data format of RAID0 is shown in Figure 1-1. Data stream of the host side are split into a small stripe and transfer to one SSD at a time. Stripe size is the data size to store in one SSD before switching to other SSDs.
■In the reference design, two SSDs are applied to run RAID0 system. Stripe size is equal to 512 bytes (one sector unit). Two SSDs connecting in the system should use same model to match characteristic and get the best performance and capacity. By using RAID0 design, the total capacity is equal to two times of one SSD and the performance for both write and read are almost two times of one SSD performance. In our test system, Write speed of RAID0 by NVMe-IP is about 4200 MB/s and Read speed is about 6200 MB/s. (Performance of one NVMe-IP demo by using one SSD are 2100 MB/s for Write command and 3200 MB/s for Read command).
■The demo does not include DDR, but uses only FIFO implemented by Embedded Memory to be the buffer. Test performance in the demo is average speed. The demo is suitable for ultra-speed data recording application which has flow control to pause data transferring when SSD is not ready to transfer data. User can modify RAID0 reference design to increase the numbers of NVMe SSD to achieve the better performance and bigger disk capacity. Also, DDR can be added to be data buffer when high performance as sustain rate is required.
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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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5-Jun-18 |
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Rev 1.1 |
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363 KB |
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