然而这并不是可进行虚拟化的唯一粒度级别。
These are not the only granularity levels that can be virtualized however.
特定的单元可能经常发生故障，但是在应用程序级别出现的唯一结果是在整体性能方面的各种怪异变化。
A particular unit might fail frequently, but the only consequence apparent at the application level is spooky variations in over-all performance.
分类唯一性只适用于某些特定的级别—而不是所有级别。
Category Uniqueness is only ticked on levels that are appropriate -not all levels.
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