* Database blocks become difficult to resize and move.
* Can no longer use standard tools like "rsync" with database files.
* The database project now needs a staff to maintain what's basically their own filesystem
* Can't keep up with hardware advances in a timely fashion.
* Throwing away all of the good stuff developed by Linux IO and FS geeks over the last 20 years.
* Clobbering all other IO-using software on the same machine.
For Postgres, raw partitions aren't even reasonable to contemplate since we'd need to add 5-10 full-time hackers to the community just to build and maintain that portion of the code.
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