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

[Corey Bryant]

Note that the code looks for wal/db devices in the block device's LV
tags after it is found. In other words:

sudo lvs -o lv_tags | grep type=block | grep ceph.wal_device
sudo lvs -o lv_tags | grep type=block | grep ceph.db_device

This is the window where the following might not yet exist, yet we know
they *should* exist based on the above tags:

sudo lvs -o lv_tags | grep type=wal
sudo lvs -o lv_tags | grep type=db

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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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