pvresize extends PVs if the underlying partition has also been extended; it shrinks PV if the allocation map permits it.
pvresize：如果底层分区也已经扩展了，那么可以用这个操作扩展PV；如果分配图允许的话，它也可以缩小 PV。
pvresize extends PVs if the underlying partition has also been extended; it shrinks PV if the allocation map permits it.
pvresize：如果底层分区也已经扩展了，那么可以用这个操作扩展PV；如果分配图允许的话，它也可以缩小 PV。
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