[Bug 1581221] Re: cinder does not ignore devices already in use

[Francis Ginther]

The nvme0n1 device does not have a 'by-id' entry in the device tree but
it does have a by-uuid entry:

ubuntu at omaha:/dev/disk$ ll by-dname/
total 0
drwxr-xr-x 2 root root  60 May 12 21:28 ./
drwxr-xr-x 5 root root 100 May 12 21:28 ../
lrwxrwxrwx 1 root root  13 May 12 21:28 bcache0 -> ../../bcache0
ubuntu at omaha:/dev/disk$ ll by-id/
total 0
drwxr-xr-x 2 root root 200 May 12 21:28 ./
drwxr-xr-x 5 root root 100 May 12 21:28 ../
lrwxrwxrwx 1 root root   9 May 12 21:28 ata-MB1000GCEEK_WCAW37040132 -> ../../sda
lrwxrwxrwx 1 root root  10 May 12 21:28 ata-MB1000GCEEK_WCAW37040132-part1 -> ../../sda1
lrwxrwxrwx 1 root root  10 May 12 21:28 ata-MB1000GCEEK_WCAW37040132-part2 -> ../../sda2
lrwxrwxrwx 1 root root   9 May 12 21:28 ata-MB1000GCEEK_WCAW37073471 -> ../../sdb
lrwxrwxrwx 1 root root   9 May 12 21:28 wwn-0x50014ee25eda851b -> ../../sdb
lrwxrwxrwx 1 root root   9 May 12 21:28 wwn-0x50014ee25edb5d76 -> ../../sda
lrwxrwxrwx 1 root root  10 May 12 21:28 wwn-0x50014ee25edb5d76-part1 -> ../../sda1
lrwxrwxrwx 1 root root  10 May 12 21:28 wwn-0x50014ee25edb5d76-part2 -> ../../sda2
ubuntu at omaha:/dev/disk$ ll by-uuid/
total 0
drwxr-xr-x 2 root root 120 May 12 21:28 ./
drwxr-xr-x 5 root root 100 May 12 21:28 ../
lrwxrwxrwx 1 root root  10 May 12 21:28 56a8bab5-971f-45a6-9bc0-1d6c2c9daae7 -> ../../sda2
lrwxrwxrwx 1 root root  10 May 12 21:28 5f294c60-fd32-48df-86d1-41c5f133b9f2 -> ../../sda1
lrwxrwxrwx 1 root root  13 May 12 21:28 6e032f96-81f3-4a0d-aa31-ed07e747119c -> ../../nvme0n1
lrwxrwxrwx 1 root root  13 May 12 21:28 a5844495-a15d-4b66-aff7-044fb7dce11c -> ../../bcache0


See https://pastebin.canonical.com/156389/ for better formatting.

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https://bugs.launchpad.net/bugs/1581221

Title:
  cinder does not ignore devices already in use

Status in cinder package in Juju Charms Collection:
  New

Bug description:
  This is from a landscape OSA deployment. Several of my hardware nodes
  have a /dev/nvme0n1 device, which is a PCIe SSD. For two of my nodes,
  I've configured it for bcache, as a result on these nodes,
  /dev/nvme0n1 is in use. However, on one node /dev/nvme0n1 is still
  unused. As a result landscape selects this as a usable cinder disk and
  passes it as a cinder block-device. When cinder is deployed to one of
  the nodes with bcache, the config-changed hook fails.

  2016-05-12 20:19:20 INFO config-changed   No physical volume label read from /dev/nvme0n1
  2016-05-12 20:19:20 INFO config-changed   Failed to read physical volume "/dev/nvme0n1"
  2016-05-12 20:19:20 INFO config-changed   No physical volume label read from /dev/nvme0n1
  2016-05-12 20:19:20 INFO config-changed   Failed to read physical volume "/dev/nvme0n1"
  2016-05-12 20:19:21 INFO config-changed Creating new GPT entries.
  2016-05-12 20:19:21 INFO config-changed GPT data structures destroyed! You may now partition the disk using fdisk or
  2016-05-12 20:19:21 INFO config-changed other utilities.
  2016-05-12 20:19:23 INFO config-changed Creating new GPT entries.
  2016-05-12 20:19:23 INFO config-changed The operation has completed successfully.
  2016-05-12 20:19:23 INFO config-changed 1+0 records in
  2016-05-12 20:19:23 INFO config-changed 1+0 records out
  2016-05-12 20:19:23 INFO config-changed 1048576 bytes (1.0 MB) copied, 0.00217673 s, 482 MB/s
  2016-05-12 20:19:23 INFO config-changed 100+0 records in
  2016-05-12 20:19:23 INFO config-changed 100+0 records out
  2016-05-12 20:19:23 INFO config-changed 51200 bytes (51 kB) copied, 0.00078845 s, 64.9 MB/s
  2016-05-12 20:19:23 INFO config-changed   Can't open /dev/nvme0n1 exclusively.  Mounted filesystem?
  2016-05-12 20:19:23 INFO config-changed Traceback (most recent call last):
  ...
  2016-05-12 20:19:23 INFO config-changed subprocess.CalledProcessError: Command '['pvcreate', u'/dev/nvme0n1']' returned non-zero exit status 5
  2016-05-12 20:19:23 ERROR juju.worker.uniter.operation runhook.go:107 hook "config-changed" failed: exit status 1

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