Hello Everyone，

     My osd is broken recently, the first 8M size block have been clean. 

     Since I use ceph-volume  create bluestore with all wal, db, slow on one disk, I lost the superblock.

     Thanks to the lvm backup, I save the superblock of Bluestore, but I can't get the bluefs superblock back.

     What can I do to save the bluefs superblock?