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Storage group is the storage of tablets. This new concept is helpful for tablet splitting, where the storage of tablet will be split in multiple compaction groups, where each can be compacted independently. The reason for not going with arena concept is that it added complexity, and it felt much more elegant to keep compaction group unchanged which at the end of the day abstracts the concept of a set of sstables that can be compacted and operated independently. When splitting, the storage group for a tablet may therefore own multiple compaction groups, left, right, and main, where main keeps the data that needs splitting. When splitting completes, only left and right compaction groups will be populated. Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>