The system requirements checklist (https://docs.yugabyte.com/latest/deploy/checklist/#disks) suggests using SSDs. But are there any future plans to add support for servers with hard-disks (HDD)?
Currently, the biggest bottleneck is DDL, which is inefficient and is being fixed in 2.1
Can you try again after that ? Then we can change some settings to work better on HDD.
It wont be official support though.