This manifests itself as the following, as reported by lsblk(1). Note
the missing Ceph LVM volume on the 6th NVME disk:

$ cat sos_commands/block/lsblk
NAME                                                                            
                      MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda                                                                             
                        8:0    0  1.8T  0 disk 
|-sda1                                                                          
                        8:1    0  512M  0 part /boot/efi
`-sda2                                                                          
                        8:2    0  1.8T  0 part 
  |-foobar--vg-root                                                             
                 253:0    0  1.8T  0 lvm  /
  `-foobar--vg-swap_1                                                           
                 253:1    0  976M  0 lvm  [SWAP]
nvme0n1                                                                         
                      259:0    0  1.8T  0 disk 
`-ceph--c576f63e--dfd4--48f7--9d60--6a7708cbccf6-osd--block--9fdd78b2--0745--47ae--b8d4--04d9803ab448
 253:6    0  1.8T  0 lvm  
nvme1n1                                                                         
                      259:1    0  1.8T  0 disk 
`-ceph--6eb6565f--6392--44a8--9213--833b09f7c0bc-osd--block--a7d3629c--724f--4218--9d15--593ec64781da
 253:5    0  1.8T  0 lvm  
nvme2n1                                                                         
                      259:2    0  1.8T  0 disk 
`-ceph--c14f9ee5--90d0--4306--9b18--99576516f76a-osd--block--bbf5bc79--edea--4e43--8414--b5140b409397
 253:4    0  1.8T  0 lvm  
nvme3n1                                                                         
                      259:3    0  1.8T  0 disk 
`-ceph--a821146b--7674--4bcc--b5e9--0126c4bd5e3b-osd--block--b9371499--ff99--4d3e--ab3f--62ec3cf918c4
 253:3    0  1.8T  0 lvm  
nvme4n1                                                                         
                      259:4    0  1.8T  0 disk 
`-ceph--2e39f75a--5d2a--49ee--beb1--5d0a2991fd6c-osd--block--a1be083e--1fa7--4397--acfa--2ff3d3491572
 253:2    0  1.8T  0 lvm  
nvme5n1                                                                         
                      259:5    0  1.8T  0 disk

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https://bugs.launchpad.net/bugs/1828617

Title:
  Hosts randomly 'losing' disks, breaking ceph-osd service enumeration

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