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is there any drawback to having too many partitions?
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A partition for each thing you might want to change the size of is my rule, or to be able to wipe independently of the others.
I usually prefer lvm over actual partitions, since it does a better job letting me think about volumes as opposed to devices.
Boot gets a partition because it's basically required. Home gets one so I can reinstall without mucking things up. The database directory gets one for similar reasons, a d because I might need to scale it up. The system itself gets one because it's most likely to get wiped or need more space.
Most of these are actually lvm volumes.