当触发器设置为volume时、不会触发Snapshot自动删除

Snapshot自动删除已将触发器设置为volume

Volume name: vol1
      State: online

Snapshot autodelete settings: state=on, commitment=try,
  trigger=volume,
  target_free_space=20%,
  delete_order=oldest_first, defer_delete=user_created,
  prefix=(not specified),

尽管卷已接近全满、但不会触发Snapshot自动删除。

::> df -h 
Filesystem         total     used    avail    capacity  Mounted on       
/vol/vol1/        224133120  214340120   9793000    96%    /vol/vol1/
/vol/vol1/.snapshot   11796480   11346020    450460    96%   /vol/vol1/.snapshot