Block device data cache power-down protection method and system

Abstract

The invention discloses a block device data cache power-down protection method and system. The method comprises the steps of setting a block device information protection region, a cache unit information protection region and a cache unit protection region in a power-down protection memory region; setting the block device information protection region, the cache unit information protection region and the cache unit protection region to be in a CPU direct-writing or no-cache mode; when a system does not lose power, storing block device cache data in a cache unit of the cache unit protection region; recording corresponding block device information in the block device information protection region and recording corresponding cache unit information in the cache unit information protection region; and when the system loses the power, according to the content recorded in the block device information protection region, the cache unit information protection region and the cache unit protection region, identifying a block device required to be subjected to data back-writing, and writing back the corresponding data of the block device into a storage medium. Therefore, the problems on asynchronism and protection of CPU caches can be solved and the complete data power-down protection is ensured; and the method and system have relatively good performance.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a system and method for power-down protection of block device data cache. Background technique [0002] In terms of computer data storage, there are mainly two methods of block device storage and file storage. In order to improve performance, computer systems often cache the data of block devices or files in the memory. When writing data, they are first written to the cache and then written back to the disk asynchronously. Including block device or file system metadata and application data, in order to ensure that the data is not lost when the system is powered off, a power-off protection function is required. There are two main methods of power-down protection. Method 1: When the power is off, the backup battery supplies power to the computer system as a whole or the computer system components except the external disk cabinet (via SAS or FC network) for a period of time. Duri...

AI Technical Summary

Problems solved by technology

However, there is a deficiency in the ADR function of this platform that it does not support synchronizing the CPU cache to the memory when the power is off. UnCacheable), due to the frequent access of metadata cached by the organization and the need for power-off protection, the performance is severely degraded; (2) If the DRAM memory is set to write back to the CPU (WriteBack) mode, the power-off data protection will be incomplete and even cause data error problem

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