[Bug 1828617] Re: Hosts randomly 'losing' disks, breaking ceph-osd service enumeration

[Corey Bryant]

Do you have access to the /var/log/ceph/ceph-volume-systemd.log after
the latest reboot? That should give us some details such as:

"[2019-05-31 20:43:44,334][systemd][WARNING] failed to find db volume,
retries left: 17"

or similar for wal volume.

If you see that the retries have been exceeded in your case you can tune
them (the new loops are using the same env vars):

http://docs.ceph.com/docs/mimic/ceph-volume/systemd/#failure-and-retries

As for the pvscan issue, I'm not sure if that is a ceph issue (?).

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

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

Status in ceph package in Ubuntu:
  Triaged

Bug description:
  Ubuntu 18.04.2 Ceph deployment.

  Ceph OSD devices utilizing LVM volumes pointing to udev-based physical devices.
  LVM module is supposed to create PVs from devices using the links in /dev/disk/by-dname/ folder that are created by udev.
  However on reboot it happens (not always, rather like race condition) that Ceph services cannot start, and pvdisplay doesn't show any volumes created. The folder /dev/disk/by-dname/ however has all necessary device created by the end of boot process.

  The behaviour can be fixed manually by running "#/sbin/lvm pvscan
  --cache --activate ay /dev/nvme0n1" command for re-activating the LVM
  components and then the services can be started.

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