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

[Wouter van Bommel]

Hi,

Installed the packages from the above ppa, rebooted the host and 4 out
of 7 osd's came up. The 3 that where missing from the `ceph osd tree`
where not running the osd daemon as they lacked the symlinks to  the db
and the wal.

Rebooted the server, and after the reboot other osd's (again 3 out of 7)
failed to start due to missing symlinks. This time it where other osd's.
So the issue is not fixed with the deb's in the ppa.

Regards,
Wouter

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

Status in ceph package in Ubuntu:
  New

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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