The principle of replication must be faithful to the original, unlike imitation and fraud.
复制的原则必须忠于原作，不同于仿制和造假。
Follow the principle of least privilege by allowing logins in the PAL only the permissions the logins must have to perform replication tasks.
遵循最小权限原则，仅允许PAL中的登录名拥有执行复制任务所必需的权限。
With the principle of data consistency, LVR lowers the response time of replication process by optimizing I/O flow on primary site and that on secondary sites.
在保证主从端数据一致的前提下，LVR通过优化主端对上层写请求的处理方式以及从端的I/O处理流程，减小了数据复制过程对应用响应时间的影响；
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