这是几个物理硬盘(两个或更多)有一个称为RAID的单元的管理的解决方法，它把他们变成了单一的、结合一体的数据存储块。
This is a solution where several physical hard disks (two or more) are governed by a unit called RAID controller, which turns them into a single, cohesive data storage block.
因为Ceph客户实现CRUSH，而且对磁盘上的文件映射块一无所知，下面的存储设备就能安全地管理对象到块的映射。
Because the Ceph clients implement CRUSH and do not have knowledge of the block mapping of files on the disks, the underlying storage devices can safely manage the mapping of objects to blocks.
当然，作为替换群成员的元素声明块可以在一个单独存储并包含在一个主模式中的模式模块中管理。
Of course, the block of element declarations that are substitution group members can be managed in a schema module that is stored separately and included in a main schema.
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