Hybrid disk array, deferred write verification method for hybrid disk array, and data recovery method for hybrid disk array

Abstract

The invention belongs to the technical field of computer storage and particularly relates to a hybrid disk array, a deferred write verification method for the hybrid disk array, and a data recovery method for the hybrid disk array. The hybrid disk array comprises a mechanical hard disk, a solid state disk and a storage controller. The solid state disk is connected with the mechanical hard disk through a system bus. The solid state disk and the mechanical hard disk are centrally mapped into logic devices by a system; the devices are accessed through a same interface; the devices are in architecture forms of RAID5 and RAID6. The hybrid disk array has the advantages that the cost of a storage system is approximate to that of an array of mechanical hard disks, the performance of the storage system is approximate to that of an array of solid state disks, capacity is higher, the performance is higher, reliability is higher, and the cost is lower. The deferred write verification method and the data recovery method for the hybrid disk array have the advantages that loss of the solid state disks is reduced, the lives of the solid state disks are prolonged, erred data can be recovered timely and effectively, and extra expenditure is avoided.

Description

technical field [0001] The invention belongs to the technical field of computer storage, and in particular relates to a hybrid disk array, a delayed write verification method and a data recovery method thereof. Background technique [0002] As the price of flash memory drops, solid-state drives based on NAND flash memory are gradually applied to storage systems. However, a single SSD cannot meet the requirements of large capacity, high performance, reliability and low cost of modern enterprise storage systems. Redundant Array of Inexpensive Disks (RAID) is an ideal choice. However, SSD-based disk arrays have the following two disadvantages: [0003] 1. Since the current price of solid-state drives is about 10 times that of mechanical hard drives, the cost of building a disk array based on solid-state drives is very high. [0004] 2. Solid-state drives are based on flash memory, and each storage block has an upper limit for erasing. If the upper limit is exceeded, the bloc...

AI Technical Summary

Problems solved by technology

[0003] 1. Since the current price of solid-state drives is about 10 times that of mechanical hard drives, the cost of building a disk array based on solid-state drives is very high

[0004] 2. Solid-state drives are based on flash memory, and each storage block has an upper limit for erasing. If the upper limit is exceeded, the block cannot be used

Its disadvantage is that the verification disk that makes up RAID4 is likely to become a system bottleneck. In addition, the cost of HPDA is also very high

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