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

[Launchpad Bug Tracker]

[Expired for lvm2 (Ubuntu Focal) because there has been no activity for
60 days.]

** Changed in: lvm2 (Ubuntu Focal)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1887372

Title:
  Cannot create lvm upon IMSM raid array

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

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

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