rear recover doesn't work because grub2-probe fails for CRC-enabled xfs

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux (RHEL) 7.3
  • kernel-3.10.0-514.el7
  • xfsprogs-4.5.0-8.el7
  • rear-1.17.2-6.el7
  • grub2-2.02-0.65.el7

Issue

  • rear recover doesn't work when XFS is used for /boot from RHEL7.3.
    grub2-install failed while rear recover was executed in rescue mode.

  • grub2-probe, which can be called by grub2-install or grub2-mkconfig, for CRC-enabled xfs fails.

  • while restoring system by xfsrestore in Installer Rescue mode, and running grub2-mkconfig following error showed:

    /usr/sbin/grub2-probe: error: unknown filesystem.

  • after system reboot the following error shows and boot fails:

    error: disk 'hd3, gpt2' not found. 
error: you need to load the kernel first.

Resolution

Update to
- grub2-2.02-0.76.el7 shipped with Advisory RHBA-2018:3264 or newer
- rear-2.00-2.el7 shipped with Advisory 2017:2052 or newer

Root Cause

Previously rear was setting the file system UUID twice, therefore filesystem metadata ended up inconsistent and grub2-install command failed.

Previously grub2 didn't support reading from XFS filesystems with new filesystem features and failed to boot off of the filesystems created during system installation.

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