Answer by Rick James for Vertical / Horizontal Scaling Disk Size MySQL or MariaDB

For analytics in Data Warehouse situations, I find that building and maintaining "Summary tables" is very effective -- one-tenth the size of data, 10x speedup for queries.

Would you care to share some info on the data and the analytics; I may have further ideas.

For making the disk space available to MySQL -- this is an OS technique. However, it might require that no table is bigger than will fit on one of the machines, and it would make MySQL somewhat fragile because all 5 servers would have to be up for MySQL to be up.

Clustrix may have a solution. Spider is another possibility; it is included with MariaDB.