Public bug reported:

Hi!

I've found, quite surprised, that xfsdump doesn't allow dump level
numbers outside of the range [0-9].  Given that even storing that number
requires a full byte (8 bits), it boggles the mind why more numbers
aren't supported.  The usefulness of supporting more numbers (24? even
255...) is for taking hourly delta snapshots of live filesystems using
xfsdump as a backup measure.

With a simple script one can write a backup that takes a full dump
(level 0) of the filesystem for the first backup of a given date, and
all other backups during that day are incrementals (levels are > 0 ...
i.e. the hour of the day the backup is taken).  However, given that the
tool only supports [0-9] as the backup level, this seems like an
arbitrary limitation.

Is there a real, technical limitation that this level is adhering to?

Cheers!

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1829409

Title:
  xfsdump doesn't allow levels beyond 0-9

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