Another file size-based optimization is delayed allocation.
另一个基于文件大小的优化是延迟分配。
We'll finish our technical overview of XFS by taking a look at delayed allocation, a feature unique to XFS.
研究一下延迟分配这个XFS独有的特性，然后我们将结束关于XFS的技术概述。
Although the delayed allocation method reduces fragmentation, over time, a large file system can become fragmented.
虽然延时分配的方法可以减少磁盘碎片，但时间久了，一个大的文件系统可能会成为碎片。
Like XFS and Reiser4, ext4fs includes delayed allocation to allocate blocks on the disk only when needed (which reduces fragmentation).
像XFS和Reiser 4一样，ext4fs还支持在必要时采取延时分配方式分配块(这样可以减少磁盘碎片)。
Resier4 was designed for better journaling through the use of wandering logs and delayed allocation of blocks until the journal is committed (as was done in XFS).
Resier4 拟定通过wandering日志和延迟分配块直至日志提交（像在 XFS 中一样）的方式来实现更优秀的日志记录。
But, because XFS delayed its allocation decision, it was able to write the data in one fell swoop, improving write performance as well as reducing overall filesystem fragmentation.
但是，因为XFS延迟了它的分配决定，所以，它能够一下子写完数据，从而提高了写性能，并减少了整个文件系统的碎片。
If XFS hadn't delayed its allocation decision, it may have unknowingly written the data into multiple non-contiguous chunks, reducing write performance significantly.
如果XFS没有延迟它的分配决定，那么，它也许已经不知不觉地将数据写到了多个非相邻块中，从而显著地降低了写性能。
This works by making sure that the allocation of paging space is delayed until the time that it is necessary to page out the page, which ensures that there is no wasted paging space.
这确保将分页空间的分配延迟到必须调出页面的时候，从而确保不会浪费分页空间。
Although Lord Carter's Digital Britain report suggested that parts of the airwaves should be handed over, the actual allocation of the spectrum has been delayed.
尽管卡特勋爵的《数位英国》有报道指出，部分相关电波频道应该提上议程，但是该频谱的实际拨款却一再被推迟。
Although Lord Carter's Digital Britain report suggested that parts of the airwaves should be handed over, the actual allocation of the spectrum has been delayed.
尽管卡特勋爵的《数位英国》有报道指出，部分相关电波频道应该提上议程，但是该频谱的实际拨款却一再被推迟。
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