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.
这种重新定位目标可以通过应用UM L概要文件和其他特定运行时的元数据更新发生在模型转换的过程中。
This retargeting can occur through model-to-model transformations by applying UML profiles and other runtime-specific metadata updates.
出现这种情况的原因如下：元数据更新删除了对原先数据块的任何引用，却指向磁盘上没有填充过数据的数据块。
Here's why this could happen: the metadata update would erase any reference to the original data block(s), but would point to data block(s) on disk that were never filled with data.
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