Commits on Mar 25, 2023

1. Add mixed raid levels rockstor#2520 …

   Extend our existing raid levels to include:
   raid1c3 and raid1c4, introduced in kernel 5.5.
   Additionally add mixed raid capability.
   We artificially reduce mixed raid profile
   options to assist with usability.
   
   Adds abstraction, with tests, to generate a profile
   from our existing pool raid levels mechanism.
   Includes:
   - Minor rename-refactor from prior TODO.
   - Enable distinguishing between single & single-dup.
   - Add an "unknown" profile as fail-through catch-all.
   - Enable easy Web-UI access to data/metadata via
   additional Pool object properties as thin PROFILE
   look-ups.
   - Surface data-metadata in pool details Web-UI page.
   - Remove now redundant single raid designator
   for data, if metadata = single. As we now have
   data-metadata surfaced we no longer need this.
   - Refactor supported profiles var for test use.
   SUPPORTED_PROFILES was a class variable without
   requirement to be this way. Move to module level
   and use in test_pool.py unsupported profile test case.

   

   phillxnet committed Mar 25, 2023
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