The cluster expands the osd, but the storage pool space becomes smaller

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hi
I have a cluster of 5 storage nodes + 2 (mon+mds+mgr) nodes for file system
storage. The usage is very good.

The cluster is now being expanded by adding storage nodes.

But when the data was backfilled, I found that the total space of the
storage pool was decreasing.

I had to mark the newly added osd as out, and the data pool space was
restored to the size before the expansion.

Can anyone help me, thanks
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