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Version 0.9.0 apart from various small bug fixes introduces two new tools - thin_metadata_{pack,unpack} - these are intended to help where it is impossible to send whole (up to 16GB) metadata to support for inspection or manual repair.

Usage is simple:

1. pack metadata:

    # thin_metadata_pack -i METADATA_DEVICE -o PACKED_FILE

2. unpack metadata:

    # thin_metadata_unpack -i PACKED_FILE -o METADATA_DEVICE

Verified with device-mapper-persistent-data-0.9.0-1.el8.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (device-mapper-persistent-data bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4457