[np422]

I used to ran a production database on top of drdb without any problem, active-passive fail-over HA-setup.

The major advantage is that no other specialized components (NAS/SAN/etc) is needed and you'll still have decent shared storage between the nodes.

Three nodes in such a cluster is highly recommended resolve/avoid any insane-in-the-split-brain scenarios, drdb-storage needs to be protected from split and can not help you to resolve it in the same way as a traditional NAS/SAN-lun.

We had to do some tuning to get the performance we needed, but this was a few years ago and the situation has probably improved since. Databases usually likes vm-dirty-* to be very low or 0.