[Bug 1678112] Re: lvm cache support lost in zesty

[Rhys]

Still happening in 20.04.

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https://bugs.launchpad.net/bugs/1678112

Title:
  lvm cache support lost in zesty

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  grub fails to work when araid1 lvm volume exists that is cached in zesty.
  grub version 2.02~beta3-4ubuntu1
  The same configuration worked on yakkety

  ~$ sudo update-grub2
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.10.0-14-generic
  Found initrd image: /boot/initrd.img-4.10.0-14-generic
  Found linux image: /boot/vmlinuz-4.8.0-45-generic
  Found initrd image: /boot/initrd.img-4.8.0-45-generic
  Found memtest86+ image: /memtest86+.elf
  Found memtest86+ image: /memtest86+.bin
  Found Windows 7 on /dev/sdc4
  Found Debian GNU/Linux wheezy/sid on /dev/mapper/lvm-debian
  Found Ubuntu 15.04 (15.04) on /dev/mapper/lvm-root2
  Found Ubuntu 14.04.1 LTS (14.04) on /dev/mapper/lvm-root3

  $ sudo lvcreate --type raid1 -L 1G lvm -n testing
    Logical volume "testing" created.
  ~$ sudo lvcreate --type cache --cachemode writeback -L 10G -n ssdcachetest lvm/testing /dev/sda1
    Using default stripesize 64.00 KiB.
    WARNING: Data redundancy is lost with writeback caching of raid logical volume!
    Logical volume lvm/testing is now cached.

  ~$ sudo update-grub2
  Generating grub configuration file ...
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  grub-probe: error: disk `lvmid/OwVp3J-KH9N-RcXl-Fh3J-ZEiZ-egg4-JRffI3/7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26' not found.

  removing the cache fixes the issue.

  lvmid/OwVp3J-KH9N-RcXl-Fh3J-ZEiZ-egg4-JRffI3/7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26 is my boot lvm partition which is a regular uncached linear partition.
    --- Logical volume ---
    LV Path                /dev/lvm/boot
    LV Name                boot
    VG Name                lvm
    LV UUID                7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26
    LV Write Access        read/write
    LV Creation host, time ubuntu, 2015-09-27 23:22:37 +0200
    LV Status              available
    # open                 1
    LV Size                1.00 GiB
    Current LE             256
    Segments               1
    Allocation             inherit
    Read ahead sectors     auto
    - currently set to     256
    Block device           253:2

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