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Description of problem:
Unless a user reads the VDO documentation regarding slabs, the supported maximum physical volume size is unknown.   This can limit the expected growth potential in the future.

The default VDO slab size is 2GB.  This will support a physical volume size up to 6TB.   

A message displayed after the VDO volume has been created will inform the user of the supported maximum physical size.

Example Message
“ The VDO volume with a slab size of 2GB can address at most 16TB of physical data.”

Mass migration to Filip.

Verified with vdo-6.2.2.117-13.el8.

Creating VDO vdo
      Logical blocks defaulted to 2435905347 blocks.
      The VDO volume can address 9 TB in 4655 data slabs, each 2 GB.
      It can grow to address at most 16 TB of physical storage in 8192 slabs.
      If a larger maximum size might be needed, use bigger slabs.

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, 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-2020:1782