osd used increased much when expand bluestore block lv

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Hi,cephers

I try to two expand test in bluestore.

First test is expands db lv which osd have separate block and db and
wal, after runs ceph-bluestore-tool buefs-bdev-expand --path XX, it
works well. perf dump shows the correct db size.


Second test is expands block lv which osd do not have separate db and wal.
when I start osd after expand, osd df show the correct size but the
usage size increase so much.

before:(get data from promethus history , maybe it is not accurate)
  444   ssd 1.00000  1.00000  50GiB  43.16GiB 5.36GiB 86.32 1.20 195

after:
  444   ssd 1.00000  1.00000  120GiB  115GiB 5.36GiB 95.53 1.20 205

I try to run expand command, but it failed,logs in
https://drive.google.com/file/d/1s6A9SylQvIzL1bZQtZckthnm7O7VeOwJ/view?usp=sharing
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