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

[Xav Paice]

Let me word that last comment differently.

I went to the host and installed the PPA update, then rebooted.

When the box booted up, the PV which hosts the wal LVs wasn't listed in
lsblk or 'pvs' or lvs.  I then ran pvscan --cache, which brought the LVs
back online, but not the OSDs, so I rebooted.

After that reboot, the behavior of the OSDs was exactly the same as
prior to the update - I reboot, and some OSDs don't come online, and are
missing symlinks.

-- 
You received this bug notification because you are a member of Ubuntu
OpenStack, which is subscribed to ceph in Ubuntu.
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/1828617/+subscriptions