如果一个快照耗尽了空间，那么所有快照将无效，并变得不可用。
If a snapshot runs out of space, then all the snapshots are invalidated and become unusable.
如果内部快照耗尽了空间，或者如果向内部快照写入失败，那么源文件系统的所有内部快照都将标记为无效。
If an internal snapshot runs out of space, or if a write to an internal snapshot fails, all internal snapshots for that source file system are marked invalid.
科恩：“这是一个评估工具，它最终能够鉴定谁是“高效”，谁是“无效”，谁有提升空间应该给予帮助。”
EMILY COHEN: "This is an evaluation instrument that is finally able to capture who is highly effective and who is ineffective and who could be doing better and could use some assistance."
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