unable to open OSD superblock on on /var/lib/ceph/osd/ceph-0

["Liu, Changcheng" <changcheng.liu@xxxxxxxxx>]

Hi all,
   I always hit below error:
     storage-0:/var/run/ceph# /usr/bin/ceph-osd -i 0 --pid-file /var/run/ceph/osd.0.pid -c /etc/ceph/ceph.conf --cluster ceph -f
     2019-01-25 14:05:20.148 7f2bd8f87180 -1  ** ERROR: unable to open OSD superblock on /var/lib/ceph/osd/ceph-0: (2) No such file or directory
  
   Could anyone give some suggestion to debug this problem?

   I've checked some info as below:
       0)storage-0:/var/lib/ceph/osd/ceph-0# cat /etc/os-release 
       NAME="CentOS Linux"
       VERSION="7 (Core)"
       ID="centos"
       ID_LIKE="rhel fedora"
       VERSION_ID="7"
       PRETTY_NAME="CentOS Linux 7 (Core)"
       ANSI_COLOR="0;31"
       CPE_NAME="cpe:/o:centos:centos:7"
       HOME_URL="https://www.centos.org/";
       BUG_REPORT_URL="https://bugs.centos.org/";
       
       CENTOS_MANTISBT_PROJECT="CentOS-7"
       CENTOS_MANTISBT_PROJECT_VERSION="7"
       REDHAT_SUPPORT_PRODUCT="centos"
       REDHAT_SUPPORT_PRODUCT_VERSION="7"

       1)storage-0:/var/lib/ceph/osd/ceph-0# ceph --version
       ceph version 13.2.2 (02899bfda814146b021136e9d8e80eba494e1126) mimic (stable)

       2)storage-0:/var/lib/ceph/osd/ceph-0# ls
       block  block_uuid  ceph_fsid  fsid  journal  journal_uuid  magic  type

       3)storage-0:/var/lib/ceph/osd/ceph-0# ls -l `readlink -f block`
       brw-rw---- 1 root disk 8, 18 Jan 25 14:07 /dev/sdb2

       4)storage-0:/var/lib/ceph/osd/ceph-0# ls -l `readlink -f journal`
       brw-rw---- 1 root disk 8, 18 Jan 25 14:07 /dev/sdb2

       5)storage-0:/var/lib/ceph/osd/ceph-0# mount | grep sdb1
       /dev/sdb1 on /var/lib/ceph/osd/ceph-0 type xfs (rw,relatime,attr2,inode64,noquota)

       6)storage-0:/var/lib/ceph/osd/ceph-0# ceph-disk list
       /dev/dm-0 other, ext4, mounted on /scratch
       /dev/dm-1 other, ext4, mounted on /var/log
       /dev/dm-2 other, ext4, mounted on /var/lib/ceph/mon
       /dev/sda :
        /dev/sda1 other, 21686148-6449-6e6f-744e-656564454649
        /dev/sda2 other, ext4, mounted on /boot
        /dev/sda3 other, ext4, mounted on /
        /dev/sda4 other, LVM2_member
       /dev/sdb :
        /dev/sdb1 ceph data, active, cluster ceph, osd uuid 486b4414-8cb9-46f5-bfcd-6d0b24a8ce5c, block /dev/sdb2, journal /dev/sdb2
        /dev/sdb2 ceph block, for /dev/sdb1
       storage-0:/var/lib/ceph/osd/ceph-0# 

       7)storage-0:/var/lib/ceph/osd/ceph-0# ceph auth list
       installed auth entries:
       
       mgr.controller-0
               key: AQBp1Elc3wI5HBAAuWXr3/GNkiR/eElrmDOI0A==
               caps: [mon] allow *
               caps: [osd] allow *
       mgr.controller-1
               key: AQD7zElcW9FSIhAAr57vVkmX2eqRXWYeBPWo+Q==
               caps: [mon] allow *
               caps: [osd] allow *
       storage-0:/var/lib/ceph/osd/ceph-0# 

B.R.
Changcheng