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

[Andrey Grebennikov]

Steve,
This is MAAS who creates these udev rules. We requested this feature to be implemented in order to be able to use persistent names in further services configuration (using templating). We couldn't go with /dev/sdX names as they may change after the reboot, and can't use wwn names as they are unique per node and don't allow us to use templates with FCB.

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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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