All those IO systems were way too complicated.
所有的IO系统都太复杂。
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”。
I realized that each of those systems had certain functionality that was consistent everywhere, like the standard IO library in c-but there was also different functionality.
我想到，这些系统上有些功能是共有的，比如标准io库，但是还有些功能是不互通的。
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