要防止脱机归档日志的单点故障，比如媒介失败，则应该使用日志镜像。
To prevent a single point of failure for offline archive logs such as media failure, log mirroring shouldl be used.
这样，具有故障设备的单元会被脱机，而生产将由剩余的单元提供服务。
This way, a cell with the failed device can be taken offline, while production is serviced by the remaining cell (or cells).
通过还原脱机或联机备份并使用回滚操作来恢复日志，就可处理这些故障。
These failures are handled by restoring either offline or online backups and using roll-forward operations to recover the logs.
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