当将一个数据块写入活动磁盘时，该数据块也将写入备用主机。
When a block is written to the active disk, a copy of the block is also written to the backup host.
在配有块写入图形存储器的系统中，该算法可以实现并行填充象素。
The algorithm foresees the pixels which will be activated in a raster line and implements parallel filling pixels.
不仅不可能同时将多个数据块写入磁盘，而且每当进行修改时马上将每个数据块写入磁盘，也对系统性能有不利影响。
Not only is it impossible to write multiple data blocks to disk simultaneously, but writing every data block to disk when any part of it changes would be bad for system performance.
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