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

[Andrey Grebennikov]

Yes, it is latest - the cluster is being re-deployed as part of
Bootstack handover.

Corey,
The bug you point to is fixing the sequence of ceph/udev. Here however udev can't create any devices as they don't exist at the moment of udev run seems so - when the host boots and settles down - there is no PVs exist at all.

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

Status in systemd package in Ubuntu:
  Incomplete

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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