活跃日志防止在崩溃恢复(比如电源故障)期间的数据损失。
Active logs are logs that prevent lost of data during crash recovery such as power failure.
一旦系统发生崩溃，日志文件就会起到一个检查点的作用，用于恢复未保存的信息，防止损坏文件系统元数据。
If a crash occurs, the journal can be used as a checkpoint to recover unsaved information and avoid corrupting file system metadata.
这种禁用故障恢复的操作是一种安全机制，用于防止数据损坏。
This action of disabling failover is a safety mechanism that prevents data corruption.
总之，日志文件系统就是一种具有故障恢复能力的文件系统，它利用日志来记录尚未提交到文件系统的修改，以防止元数据破坏(请参见图1)。
To sum up, journaling file systems are fault-resilient file systems that use a journal to log changes before they're committed to the file system to avoid metadata corruption (see Figure 1).
与HA相关的一个术语是灾难恢复（Disaster Recovery，DR），DR与 HA 的不同之处在于，它侧重于保护数据，防止因灾难性故障导致数据丢失。
Related to HA is Disaster Recovery (DR), DR is different from HA in that it focuses on protecting data against data loss caused by a catastrophic failure.
为事故现场重现、事故原因分析以及事故责任认定提供详细准确的数据，便于事故现场快速恢复交通，防止交通拥堵。
It provides detailed and precise data for reproducing the accident spot and analyzing the reason and responsibility. It helps the traffic to recover and prevent traffic jam.
为事故现场重现、事故原因分析以及事故责任认定提供详细准确的数据，便于事故现场快速恢复交通，防止交通拥堵。
It provides detailed and precise data for reproducing the accident spot and analyzing the reason and responsibility. It helps the traffic to recover and prevent traffic jam.
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