... 分片线性流形：piecewise linear manifold 分配元：distributive element 分配问题：allocation problem ...
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正如您将从我前一篇文章所回忆的一样，分配组让XFS并行执行多个元数据操作。
As you'll recall from my previous article, allocation groups let XFS perform multiple metadata operations in parallel.
因为从未给这些文件分配任何块，所以，也就不必释放任何块，甚至根本没有触及底层文件系统元数据。
Since no blocks are ever allocated, there's no need to deallocate any blocks, and the underlying filesystem metadata doesn't even get touched.
分配组还有助于在多处理器系统上优化并行io性能，因为可以同时有多个元数据更新处于“在传输中”。
Allocation groups also help to optimize parallel IO performance on multiprocessor systems, because more than one metadata update can be "in transit" at the same time.
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