连续数据保护中的滑动窗口技术的优化

Optimization of Sliding Window Technology in Continuous Data Protection

连续数据保护技术是减少企业数据损毁的重要方法。由于每次需要对I/O进行备份,存储空间的容量成为限制CDP有效备份时间长度的主要因素。然而,对于大多数应用来说,其出现峰值写入的情况并不常见,存储资源浪费严重。本文以传统滑动窗口机制为基础,将其进行优化,实现基于I/O负载变化的窗口自动调整,有效地提高存储资源的利用率,使用户可以利用有限资源,在绝大多数情况下拥有更好的数据保护能力。实验表明该方案不仅提高了备份盘的利用率,而且减少了数据恢复的最大数据丢失量(Recovery Point Object,RPO)。

Continuous data protection technology is an important method to reduce the damage of enterprise data. As per I/O capacity of backup, storage space becomes the main factors that limit the length of the CDP effective backup time. However, for most applications, the peak is not very commonly, serious waste of storage resources. This paper takes traditional sliding window mechanism as the foundation to optimize the window automatically adjust based on the I/O load changes, effectively improve storage resource utilization, so that users can take advantage of limited resources, in most cases, they have better data protection. The experiments show that the program not only improves the utilization of the backup disk, but also reduces the maximum data loss data recovery.