[Bug 1887372] Re: Cannot create lvm upon IMSM raid array

[Jeff Lane]

Please verify this is no longer an issue in Focal or Hirsute based on
Graham's comment #3 above.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to lvm2 in Ubuntu.
https://bugs.launchpad.net/bugs/1887372

Title:
  Cannot create lvm upon IMSM raid array

Status in lvm2 package in Ubuntu:
  Incomplete
Status in lvm2 source package in Focal:
  Incomplete
Status in lvm2 source package in Groovy:
  Won't Fix
Status in lvm2 source package in Hirsute:
  Incomplete

Bug description:
  The issue has been observed on 2.3.7 (Ubuntu 20.04).
  Reported to lvm team:
  https://bugzilla.redhat.com/show_bug.cgi?id=1855251

  Steps to Reproduce:
  1. Create IMSM raid array:
  #mdadm -CR imsm -e imsm -n2 /dev/nvme[01]n1
  #mdadm -CR vol -l1 -n2 /dev/nvme[01]n1 -z 5G

  2. Create lvm volume on raid:
  # pvcreate -ff -y /dev/md/vol
  # vgcreate group0 /dev/md/vol
  # lvcreate -Z y -y -l +100%FREE group0 -n lvm0

  Actual results:
  Vg creation fails.

  Expected results:
  LVM should be able to determine the best drive and ignore duplicates.

  Additional info:
  IMSM metadata is written at the end of the drive. The first drive sector belongs to the raid volume and other metadata saved there (like lvm) can be recognized directly on raid members.

  The following patches should fix the issue (not verified yet):
  https://sourceware.org/git/?p=lvm2.git;a=commit;h=23774f997ea077f2cbe8a32bd8bccdd7f4560cca
  https://sourceware.org/git/?p=lvm2.git;a=commit;h=00c9a788cc617e5e40746dee2e17287d61ee5c81

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1887372/+subscriptions