Method for realizing RAID in multi-tenant solid-state disk, controller and multi-tenant solid-state disk

Abstract

The invention discloses a method for realizing RAID (Redundant Array of Independent Disks) in a multi-tenant solid-state disk, a controller and a multi-tenant solid-state disk, and belong to the technical field of storage. The method comprises the following steps: forming an RAID strip by flash memory pages with the same offset in each flash memory wafer, and storing check information of each strip in an NVM (Non-Volatile Memory) wafer; if the tenant requests to write the new data page, writing the new data page into an idle flash memory page; if the tenant requests to update part of the datapages, reading old data pages to be merged to obtain new data pages, meanwhile, marking the old data pages as invalid, and updating corresponding check pages to be moved out for protection; if the tenant requests to update the complete data page, writing the complete data page into an idle flash memory page, and marking the old data page as invalid; when data is written into the idle flash memorypage each time, updating the corresponding check page to add the check page into protection; and when the I / O is idle, reading the protected invalid data page and updating the corresponding check pageso as to move the protected invalid data page out of the protection. According to the invention, the storage reliability of the multi-tenant solid-state disk can be ensured, and the tenant service quality is improved.

Description

technical field [0001] The invention belongs to the technical field of storage, and more specifically relates to a method for realizing RAID in a multi-tenant solid-state disk, a controller and a multi-tenant solid-state disk. Background technique [0002] Solid State Disk (SSD) based on NAND flash memory has the advantages of high performance, low power consumption and small size, and its storage capacity continues to increase, and its cost continues to decrease, so it has been widely used in data centers. In order to provide large capacity and high throughput, the solid-state disk adopts a highly parallel storage structure, that is, it contains multiple flash memory wafers (a wafer is the smallest storage unit that independently executes flash memory operation commands), for example, 128 64GB wafers form an 8TB SSD. [0003] On the one hand, in order to improve storage space utilization and cost-effectiveness, there are more and more scenarios where large-capacity SSDs ar...

AI Technical Summary

Problems solved by technology

Therefore, existing RAID methods are not suitable for multi-tenant SSDs based on hardware isolation

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