DISK_NAME返回存储库磁盘名。
集群存储库磁盘用作所有集群配置数据的中央存储库。
The cluster repository disk is used as the central repository for all the cluster configuration data.
只要日志中包含关于已经提交并外部化到数据库磁盘上的事务的信息，就可以以循环日志的形式重用该日志。
A log can be reused in circular logging as long as it only contains information about transactions that have already been committed and externalized to the database disk.
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