[Bug 1666853] Re: grub-probe fail when fs is larger than 2tb

[Jared Baker]

Possibly related bugs:
https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1812411
https://bugs.launchpad.net/cloud-utils/+bug/1762748

We run an OpenStack cloud and provide very large instances to our users
and noticed that there was possibly a breaking change made in 1762748
which resulted in my new bug submission 1812411.

I'd be happy to help test this issue as it is easily reproducible in my
environment.

Thank you

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https://bugs.launchpad.net/bugs/1666853

Title:
  grub-probe fail when fs is larger than 2tb

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  don't really know if this is a resize2fs problem or a grub problem.
  But we discovered it when trying to cloud-init bootstrap a node with larger than 2 TB disk.

  Create a virtual or a physical node with more than 2TB disk.
  install ubuntu cloud image on disk.
  boot and let cloud init run it's course, after that grub2 os-probe will fail with this error message:
  grub-probe: error: unknown filesystem.

  Have tested this in both trusty and xenial

  Update, adding parted info
  # parted -l
  Model: Virtio Block Device (virtblk)
  Disk /dev/vda: 2255GB
  Sector size (logical/physical): 512B/512B
  Partition Table: gpt
  Disk Flags:

  Number  Start   End     Size    File system     Name             Flags
   1      1049kB  33.6MB  32.5MB                  grub             bios_grub
   2      33.6MB  8590MB  8556MB  linux-swap(v1)  swap
   3      8590MB  2255GB  2246GB  ext4            cloudimg-rootfs  boot, esp

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