Primarily, XFS USES allocation groups so that it can efficiently handle parallel IO.
主要原因是，XFS使用分配组，以便能有效地处理并行io。
We design and implement parallel IO strategy to solve the insufficiency of the existing strategy.
针对已有的主端IO策略中存在的各种缺陷，设计并实现了并行IO策略。
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.
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”。
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