陷阱3：管理外部卷组。
可以将外部卷组修改给大型或可伸缩的卷组。
You can change external volume groups to big or scalable volume groups.
当客户拥有多个外部卷组并且文件系统按照分层结构连接，那么就很容易出现上述情况。
I have seen this typically when a customer has several external volume groups and file systems are hierarchically linked.
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